refactor: use ajv instead of cafy (#8324)

* wip

* wip

* Update abuse-user-reports.ts

* Update files.ts

* Update list-remote.ts

* Update list.ts

* Update show-users.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* Update search.ts

* Update reactions.ts

* Update search.ts

* wip

* wip

* wip

* wip

* Update update.ts

* Update relation.ts

* Update available.ts

* wip

* wip

* wip

* Update packages/backend/src/server/api/define.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

* Update define.ts

* Update define.ts

* typo

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* wip

* Update signup.ts

* Update call.ts

* minimum for limit

* type

* remove needless annotation

* wip

* Update signup.ts

* wip

* wip

* fix

* Update create.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

58 files changed, 621 insertions, 973 deletions

diff --git a/packages/backend/src/server/api/endpoints/admin/abuse-user-reports.ts b/packages/backend/src/server/api/endpoints/admin/abuse-user-reports.ts
index ed7b146d03..97b7bc7dba 100644
--- a/packages/backend/src/server/api/endpoints/admin/abuse-user-reports.ts
+++ b/packages/backend/src/server/api/endpoints/admin/abuse-user-reports.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { AbuseUserReports } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -10,49 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-
-		state: {
-			validator: $.optional.nullable.str,
-			default: null,
-		},
-
-		reporterOrigin: {
-			validator: $.optional.str.or([
-				'combined',
-				'local',
-				'remote',
-			]),
-			default: 'combined',
-		},
-
-		targetUserOrigin: {
-			validator: $.optional.str.or([
-				'combined',
-				'local',
-				'remote',
-			]),
-			default: 'combined',
-		},
-
-		forwarded: {
-			validator: $.optional.bool,
-			default: false,
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -115,8 +70,22 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+		state: { type: 'string', nullable: true, default: null },
+		reporterOrigin: { type: 'string', enum: ['combined', 'local', 'remote'], default: "combined" },
+		targetUserOrigin: { type: 'string', enum: ['combined', 'local', 'remote'], default: "combined" },
+		forwarded: { type: 'boolean', default: false },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const query = makePaginationQuery(AbuseUserReports.createQueryBuilder('report'), ps.sinceId, ps.untilId);
 
 	switch (ps.state) {
@@ -134,7 +103,7 @@ export default define(meta, async (ps) => {
 		case 'remote': query.andWhere('report.targetUserHost IS NOT NULL'); break;
 	}
 
-	const reports = await query.take(ps.limit!).getMany();
+	const reports = await query.take(ps.limit).getMany();
 
 	return await AbuseUserReports.packMany(reports);
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/accounts/create.ts b/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
index 20f1232959..50b2eb0427 100644
--- a/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/accounts/create.ts
@@ -5,16 +5,6 @@ import { signup } from '../../../common/signup';
 export const meta = {
 	tags: ['admin'],
 
-	params: {
-		username: {
-			validator: Users.validateLocalUsername,
-		},
-
-		password: {
-			validator: Users.validatePassword,
-		},
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -28,8 +18,17 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		username: Users.localUsernameSchema,
+		password: Users.passwordSchema,
+	},
+	required: ['username', 'password'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, _me) => {
+export default define(meta, paramDef, async (ps, _me) => {
 	const me = _me ? await Users.findOneOrFail(_me.id) : null;
 	const noUsers = (await Users.count({
 		host: null,
diff --git a/packages/backend/src/server/api/endpoints/admin/accounts/delete.ts b/packages/backend/src/server/api/endpoints/admin/accounts/delete.ts
index 1701c1e3a7..99d61b2f32 100644
--- a/packages/backend/src/server/api/endpoints/admin/accounts/delete.ts
+++ b/packages/backend/src/server/api/endpoints/admin/accounts/delete.ts
@@ -1,26 +1,26 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Users } from '@/models/index';
 import { doPostSuspend } from '@/services/suspend-user';
 import { publishUserEvent } from '@/services/stream';
 import { createDeleteAccountJob } from '@/queue';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	tags: ['admin'],
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/ad/create.ts b/packages/backend/src/server/api/endpoints/admin/ad/create.ts
index 00ad2012fe..9883efefe7 100644
--- a/packages/backend/src/server/api/endpoints/admin/ad/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/ad/create.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Ads } from '@/models/index';
 import { genId } from '@/misc/gen-id';
@@ -8,34 +7,24 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		url: {
-			validator: $.str.min(1),
-		},
-		memo: {
-			validator: $.str,
-		},
-		place: {
-			validator: $.str,
-		},
-		priority: {
-			validator: $.str,
-		},
-		ratio: {
-			validator: $.num.int().min(0),
-		},
-		expiresAt: {
-			validator: $.num.int(),
-		},
-		imageUrl: {
-			validator: $.str.min(1),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		url: { type: 'string', minLength: 1 },
+		memo: { type: 'string' },
+		place: { type: 'string' },
+		priority: { type: 'string' },
+		ratio: { type: 'integer' },
+		expiresAt: { type: 'integer' },
+		imageUrl: { type: 'string', minLength: 1 },
 	},
+	required: ['url', 'memo', 'place', 'priority', 'ratio', 'expiresAt', 'imageUrl'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	await Ads.insert({
 		id: genId(),
 		createdAt: new Date(),
diff --git a/packages/backend/src/server/api/endpoints/admin/ad/delete.ts b/packages/backend/src/server/api/endpoints/admin/ad/delete.ts
index c0124e2484..dfd873f016 100644
--- a/packages/backend/src/server/api/endpoints/admin/ad/delete.ts
+++ b/packages/backend/src/server/api/endpoints/admin/ad/delete.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Ads } from '@/models/index';
 import { ApiError } from '../../../error';
 
@@ -10,12 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchAd: {
 			message: 'No such ad.',
@@ -25,8 +17,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['id'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const ad = await Ads.findOne(ps.id);
 
 	if (ad == null) throw new ApiError(meta.errors.noSuchAd);
diff --git a/packages/backend/src/server/api/endpoints/admin/ad/list.ts b/packages/backend/src/server/api/endpoints/admin/ad/list.ts
index 7a83637f3b..83fdedef77 100644
--- a/packages/backend/src/server/api/endpoints/admin/ad/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/ad/list.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { Ads } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
@@ -9,29 +7,24 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const query = makePaginationQuery(Ads.createQueryBuilder('ad'), ps.sinceId, ps.untilId)
 		.andWhere('ad.expiresAt > :now', { now: new Date() });
 
-	const ads = await query.take(ps.limit!).getMany();
+	const ads = await query.take(ps.limit).getMany();
 
 	return ads;
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/ad/update.ts b/packages/backend/src/server/api/endpoints/admin/ad/update.ts
index c2b09ab9cf..bf4bce5150 100644
--- a/packages/backend/src/server/api/endpoints/admin/ad/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/ad/update.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Ads } from '@/models/index';
 import { ApiError } from '../../../error';
 
@@ -10,33 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-		memo: {
-			validator: $.str,
-		},
-		url: {
-			validator: $.str.min(1),
-		},
-		imageUrl: {
-			validator: $.str.min(1),
-		},
-		place: {
-			validator: $.str,
-		},
-		priority: {
-			validator: $.str,
-		},
-		ratio: {
-			validator: $.num.int().min(0),
-		},
-		expiresAt: {
-			validator: $.num.int(),
-		},
-	},
-
 	errors: {
 		noSuchAd: {
 			message: 'No such ad.',
@@ -46,8 +17,23 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+		memo: { type: 'string' },
+		url: { type: 'string', minLength: 1 },
+		imageUrl: { type: 'string', minLength: 1 },
+		place: { type: 'string' },
+		priority: { type: 'string' },
+		ratio: { type: 'integer' },
+		expiresAt: { type: 'integer' },
+	},
+	required: ['id', 'memo', 'url', 'imageUrl', 'place', 'priority', 'ratio', 'expiresAt'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const ad = await Ads.findOne(ps.id);
 
 	if (ad == null) throw new ApiError(meta.errors.noSuchAd);
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
index 24c4caa37d..8d2bda9781 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Announcements } from '@/models/index';
 import { genId } from '@/misc/gen-id';
@@ -9,18 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		title: {
-			validator: $.str.min(1),
-		},
-		text: {
-			validator: $.str.min(1),
-		},
-		imageUrl: {
-			validator: $.nullable.str.min(1),
-		},
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -57,8 +44,18 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		title: { type: 'string', minLength: 1 },
+		text: { type: 'string', minLength: 1 },
+		imageUrl: { type: 'string', nullable: true, minLength: 1 },
+	},
+	required: ['title', 'text', 'imageUrl'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const announcement = await Announcements.insert({
 		id: genId(),
 		createdAt: new Date(),
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/delete.ts b/packages/backend/src/server/api/endpoints/admin/announcements/delete.ts
index 5548f99006..f0141ca595 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/delete.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/delete.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Announcements } from '@/models/index';
 import { ApiError } from '../../../error';
 
@@ -10,12 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchAnnouncement: {
 			message: 'No such announcement.',
@@ -25,8 +17,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['id'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const announcement = await Announcements.findOne(ps.id);
 
 	if (announcement == null) throw new ApiError(meta.errors.noSuchAnnouncement);
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/list.ts b/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
index e5cc53ccdd..993f9877d2 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { Announcements, AnnouncementReads } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
@@ -10,21 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -69,11 +52,21 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const query = makePaginationQuery(Announcements.createQueryBuilder('announcement'), ps.sinceId, ps.untilId);
 
-	const announcements = await query.take(ps.limit!).getMany();
+	const announcements = await query.take(ps.limit).getMany();
 
 	for (const announcement of announcements) {
 		(announcement as any).reads = await AnnouncementReads.count({
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/update.ts b/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
index f66293bb18..f905616b3e 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Announcements } from '@/models/index';
 import { ApiError } from '../../../error';
 
@@ -10,21 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-		title: {
-			validator: $.str.min(1),
-		},
-		text: {
-			validator: $.str.min(1),
-		},
-		imageUrl: {
-			validator: $.nullable.str.min(1),
-		},
-	},
-
 	errors: {
 		noSuchAnnouncement: {
 			message: 'No such announcement.',
@@ -34,8 +17,19 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+		title: { type: 'string', minLength: 1 },
+		text: { type: 'string', minLength: 1 },
+		imageUrl: { type: 'string', nullable: true, minLength: 1 },
+	},
+	required: ['id', 'title', 'text', 'imageUrl'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const announcement = await Announcements.findOne(ps.id);
 
 	if (announcement == null) throw new ApiError(meta.errors.noSuchAnnouncement);
diff --git a/packages/backend/src/server/api/endpoints/admin/delete-all-files-of-a-user.ts b/packages/backend/src/server/api/endpoints/admin/delete-all-files-of-a-user.ts
index 249e63a0f8..41e2c23488 100644
--- a/packages/backend/src/server/api/endpoints/admin/delete-all-files-of-a-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/delete-all-files-of-a-user.ts
@@ -1,24 +1,24 @@
-import $ from 'cafy';
 import define from '../../define';
 import { deleteFile } from '@/services/drive/delete-file';
 import { DriveFiles } from '@/models/index';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	tags: ['admin'],
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const files = await DriveFiles.find({
 		userId: ps.userId,
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/drive/clean-remote-files.ts b/packages/backend/src/server/api/endpoints/admin/drive/clean-remote-files.ts
index acabbfef5c..9b127eb5d3 100644
--- a/packages/backend/src/server/api/endpoints/admin/drive/clean-remote-files.ts
+++ b/packages/backend/src/server/api/endpoints/admin/drive/clean-remote-files.ts
@@ -8,7 +8,13 @@ export const meta = {
 	requireModerator: true,
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	createCleanRemoteFilesJob();
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/drive/cleanup.ts b/packages/backend/src/server/api/endpoints/admin/drive/cleanup.ts
index 452e7069a8..1c63af6a17 100644
--- a/packages/backend/src/server/api/endpoints/admin/drive/cleanup.ts
+++ b/packages/backend/src/server/api/endpoints/admin/drive/cleanup.ts
@@ -10,8 +10,14 @@ export const meta = {
 	requireModerator: true,
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const files = await DriveFiles.find({
 		userId: IsNull(),
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/drive/files.ts b/packages/backend/src/server/api/endpoints/admin/drive/files.ts
index 264f549867..56a8c1c642 100644
--- a/packages/backend/src/server/api/endpoints/admin/drive/files.ts
+++ b/packages/backend/src/server/api/endpoints/admin/drive/files.ts
@@ -1,8 +1,6 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { DriveFiles } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	tags: ['admin'],
@@ -10,39 +8,6 @@ export const meta = {
 	requireCredential: false,
 	requireModerator: true,
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-
-		type: {
-			validator: $.optional.nullable.str.match(/^[a-zA-Z0-9\/\-*]+$/),
-		},
-
-		origin: {
-			validator: $.optional.str.or([
-				'combined',
-				'local',
-				'remote',
-			]),
-			default: 'local',
-		},
-
-		hostname: {
-			validator: $.optional.nullable.str,
-			default: null,
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -54,8 +19,21 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+		type: { type: 'string', nullable: true, pattern: /^[a-zA-Z0-9\/\-*]+$/.toString().slice(1, -1) },
+		origin: { type: 'string', enum: ['combined', 'local', 'remote'], default: "local" },
+		hostname: { type: 'string', nullable: true, default: null },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const query = makePaginationQuery(DriveFiles.createQueryBuilder('file'), ps.sinceId, ps.untilId);
 
 	if (ps.origin === 'local') {
@@ -76,7 +54,7 @@ export default define(meta, async (ps, me) => {
 		}
 	}
 
-	const files = await query.take(ps.limit!).getMany();
+	const files = await query.take(ps.limit).getMany();
 
 	return await DriveFiles.packMany(files, { detail: true, withUser: true, self: true });
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/drive/show-file.ts b/packages/backend/src/server/api/endpoints/admin/drive/show-file.ts
index 5d9a1f2703..bb1ed1072a 100644
--- a/packages/backend/src/server/api/endpoints/admin/drive/show-file.ts
+++ b/packages/backend/src/server/api/endpoints/admin/drive/show-file.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { ApiError } from '../../../error';
 import { DriveFiles } from '@/models/index';
@@ -10,16 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		fileId: {
-			validator: $.optional.type(ID),
-		},
-
-		url: {
-			validator: $.optional.str,
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -161,8 +149,17 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+		url: { type: 'string' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const file = ps.fileId ? await DriveFiles.findOne(ps.fileId) : await DriveFiles.findOne({
 		where: [{
 			url: ps.url,
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/add-aliases-bulk.ts b/packages/backend/src/server/api/endpoints/admin/emoji/add-aliases-bulk.ts
index f0fd73c276..9aeb04d247 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/add-aliases-bulk.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/add-aliases-bulk.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection, In } from 'typeorm';
 import { ApiError } from '../../../error';
@@ -10,20 +8,23 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		ids: {
-			validator: $.arr($.type(ID)),
-		},
-
-		aliases: {
-			validator: $.arr($.str),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		ids: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
+		aliases: { type: 'array', items: {
+			type: 'string',
+		} },
 	},
+	required: ['ids', 'aliases'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const emojis = await Emojis.find({
 		id: In(ps.ids),
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/add.ts b/packages/backend/src/server/api/endpoints/admin/emoji/add.ts
index 1dfeae262f..718ecae4b1 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/add.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/add.ts
@@ -1,11 +1,9 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Emojis, DriveFiles } from '@/models/index';
 import { genId } from '@/misc/gen-id';
 import { getConnection } from 'typeorm';
 import { insertModerationLog } from '@/services/insert-moderation-log';
 import { ApiError } from '../../../error';
-import { ID } from '@/misc/cafy-id';
 import rndstr from 'rndstr';
 import { publishBroadcastStream } from '@/services/stream';
 
@@ -15,12 +13,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchFile: {
 			message: 'No such file.',
@@ -30,8 +22,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['fileId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const file = await DriveFiles.findOne(ps.fileId);
 
 	if (file == null) throw new ApiError(meta.errors.noSuchFile);
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/copy.ts b/packages/backend/src/server/api/endpoints/admin/emoji/copy.ts
index 17cbf208aa..fc20ff0a84 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/copy.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/copy.ts
@@ -1,11 +1,9 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Emojis } from '@/models/index';
 import { genId } from '@/misc/gen-id';
 import { getConnection } from 'typeorm';
 import { ApiError } from '../../../error';
 import { DriveFile } from '@/models/entities/drive-file';
-import { ID } from '@/misc/cafy-id';
 import { uploadFromUrl } from '@/services/drive/upload-from-url';
 import { publishBroadcastStream } from '@/services/stream';
 
@@ -15,12 +13,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		emojiId: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchEmoji: {
 			message: 'No such emoji.',
@@ -42,8 +34,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		emojiId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['emojiId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const emoji = await Emojis.findOne(ps.emojiId);
 
 	if (emoji == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/delete-bulk.ts b/packages/backend/src/server/api/endpoints/admin/emoji/delete-bulk.ts
index 797a5de672..792e72ff97 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/delete-bulk.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/delete-bulk.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection, In } from 'typeorm';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -11,16 +9,20 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		ids: {
-			validator: $.arr($.type(ID)),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		ids: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
 	},
+	required: ['ids'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const emojis = await Emojis.find({
 		id: In(ps.ids),
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/delete.ts b/packages/backend/src/server/api/endpoints/admin/emoji/delete.ts
index 1580439024..15d44b3a0e 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/delete.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/delete.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection } from 'typeorm';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -12,12 +10,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-	},
-
 	errors: {
 		noSuchEmoji: {
 			message: 'No such emoji.',
@@ -27,8 +19,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['id'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const emoji = await Emojis.findOne(ps.id);
 
 	if (emoji == null) throw new ApiError(meta.errors.noSuchEmoji);
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/import-zip.ts b/packages/backend/src/server/api/endpoints/admin/emoji/import-zip.ts
index 8856a38f24..5ee6dd4c8d 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/import-zip.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/import-zip.ts
@@ -1,21 +1,22 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { createImportCustomEmojisJob } from '@/queue/index';
 import ms from 'ms';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	secure: true,
 	requireCredential: true,
 	requireModerator: true,
-	params: {
-		fileId: {
-			validator: $.type(ID),
-		},
+} as const;
+
+const paramDef = {
+	type: 'object',
+	properties: {
+		fileId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['fileId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	createImportCustomEmojisJob(user, ps.fileId);
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/list-remote.ts b/packages/backend/src/server/api/endpoints/admin/emoji/list-remote.ts
index 6e502547f5..865715968a 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/list-remote.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/list-remote.ts
@@ -1,9 +1,7 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Emojis } from '@/models/index';
 import { toPuny } from '@/misc/convert-host';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	tags: ['admin'],
@@ -11,31 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		query: {
-			validator: $.optional.nullable.str,
-			default: null,
-		},
-
-		host: {
-			validator: $.optional.nullable.str,
-			default: null,
-		},
-
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -77,8 +50,20 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		query: { type: 'string', nullable: true, default: null },
+		host: { type: 'string', nullable: true, default: null },
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const q = makePaginationQuery(Emojis.createQueryBuilder('emoji'), ps.sinceId, ps.untilId);
 
 	if (ps.host == null) {
@@ -93,7 +78,7 @@ export default define(meta, async (ps) => {
 
 	const emojis = await q
 		.orderBy('emoji.id', 'DESC')
-		.take(ps.limit!)
+		.take(ps.limit)
 		.getMany();
 
 	return Emojis.packMany(emojis);
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/list.ts b/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
index 76ef190f94..0e23132d99 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/list.ts
@@ -1,8 +1,6 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Emojis } from '@/models/index';
 import { makePaginationQuery } from '../../../common/make-pagination-query';
-import { ID } from '@/misc/cafy-id';
 import { Emoji } from '@/models/entities/emoji';
 
 export const meta = {
@@ -11,26 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		query: {
-			validator: $.optional.nullable.str,
-			default: null,
-		},
-
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -72,8 +50,19 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		query: { type: 'string', nullable: true, default: null },
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const q = makePaginationQuery(Emojis.createQueryBuilder('emoji'), ps.sinceId, ps.untilId)
 		.andWhere(`emoji.host IS NULL`);
 
@@ -81,7 +70,7 @@ export default define(meta, async (ps) => {
 
 	if (ps.query) {
 		//q.andWhere('emoji.name ILIKE :q', { q: `%${ps.query}%` });
-		//const emojis = await q.take(ps.limit!).getMany();
+		//const emojis = await q.take(ps.limit).getMany();
 
 		emojis = await q.getMany();
 
@@ -90,9 +79,9 @@ export default define(meta, async (ps) => {
 			emoji.aliases.some(a => a.includes(ps.query!)) ||
 			emoji.category?.includes(ps.query!));
 
-		emojis.splice(ps.limit! + 1);
+		emojis.splice(ps.limit + 1);
 	} else {
-		emojis = await q.take(ps.limit!).getMany();
+		emojis = await q.take(ps.limit).getMany();
 	}
 
 	return Emojis.packMany(emojis);
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/remove-aliases-bulk.ts b/packages/backend/src/server/api/endpoints/admin/emoji/remove-aliases-bulk.ts
index c49f84b7fb..e6ccbf684d 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/remove-aliases-bulk.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/remove-aliases-bulk.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection, In } from 'typeorm';
 import { ApiError } from '../../../error';
@@ -10,20 +8,23 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		ids: {
-			validator: $.arr($.type(ID)),
-		},
-
-		aliases: {
-			validator: $.arr($.str),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		ids: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
+		aliases: { type: 'array', items: {
+			type: 'string',
+		} },
 	},
+	required: ['ids', 'aliases'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const emojis = await Emojis.find({
 		id: In(ps.ids),
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/set-aliases-bulk.ts b/packages/backend/src/server/api/endpoints/admin/emoji/set-aliases-bulk.ts
index 06197820f0..30a1c28af6 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/set-aliases-bulk.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/set-aliases-bulk.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection, In } from 'typeorm';
 import { ApiError } from '../../../error';
@@ -10,20 +8,23 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		ids: {
-			validator: $.arr($.type(ID)),
-		},
-
-		aliases: {
-			validator: $.arr($.str),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		ids: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
+		aliases: { type: 'array', items: {
+			type: 'string',
+		} },
 	},
+	required: ['ids', 'aliases'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	await Emojis.update({
 		id: In(ps.ids),
 	}, {
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/set-category-bulk.ts b/packages/backend/src/server/api/endpoints/admin/emoji/set-category-bulk.ts
index f0645f111b..9679e4a369 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/set-category-bulk.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/set-category-bulk.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection, In } from 'typeorm';
 import { ApiError } from '../../../error';
@@ -10,20 +8,21 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		ids: {
-			validator: $.arr($.type(ID)),
-		},
-
-		category: {
-			validator: $.optional.nullable.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		ids: { type: 'array', items: {
+			type: 'string', format: 'misskey:id',
+		} },
+		category: { type: 'string', nullable: true },
 	},
+	required: ['ids'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	await Emojis.update({
 		id: In(ps.ids),
 	}, {
diff --git a/packages/backend/src/server/api/endpoints/admin/emoji/update.ts b/packages/backend/src/server/api/endpoints/admin/emoji/update.ts
index 54a2cf9517..da5a5f005e 100644
--- a/packages/backend/src/server/api/endpoints/admin/emoji/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/emoji/update.ts
@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../../define';
-import { ID } from '@/misc/cafy-id';
 import { Emojis } from '@/models/index';
 import { getConnection } from 'typeorm';
 import { ApiError } from '../../../error';
@@ -11,24 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		id: {
-			validator: $.type(ID),
-		},
-
-		name: {
-			validator: $.str,
-		},
-
-		category: {
-			validator: $.optional.nullable.str,
-		},
-
-		aliases: {
-			validator: $.arr($.str),
-		},
-	},
-
 	errors: {
 		noSuchEmoji: {
 			message: 'No such emoji.',
@@ -38,8 +18,21 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		id: { type: 'string', format: 'misskey:id' },
+		name: { type: 'string' },
+		category: { type: 'string', nullable: true },
+		aliases: { type: 'array', items: {
+			type: 'string',
+		} },
+	},
+	required: ['id', 'name', 'aliases'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const emoji = await Emojis.findOne(ps.id);
 
 	if (emoji == null) throw new ApiError(meta.errors.noSuchEmoji);
diff --git a/packages/backend/src/server/api/endpoints/admin/federation/delete-all-files.ts b/packages/backend/src/server/api/endpoints/admin/federation/delete-all-files.ts
index db023c6f0b..e98de40ff8 100644
--- a/packages/backend/src/server/api/endpoints/admin/federation/delete-all-files.ts
+++ b/packages/backend/src/server/api/endpoints/admin/federation/delete-all-files.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { deleteFile } from '@/services/drive/delete-file';
 import { DriveFiles } from '@/models/index';
@@ -8,16 +7,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		host: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		host: { type: 'string' },
 	},
+	required: ['host'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const files = await DriveFiles.find({
 		userHost: ps.host,
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/federation/refresh-remote-instance-metadata.ts b/packages/backend/src/server/api/endpoints/admin/federation/refresh-remote-instance-metadata.ts
index b68252ef2e..d6e3a15c61 100644
--- a/packages/backend/src/server/api/endpoints/admin/federation/refresh-remote-instance-metadata.ts
+++ b/packages/backend/src/server/api/endpoints/admin/federation/refresh-remote-instance-metadata.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Instances } from '@/models/index';
 import { toPuny } from '@/misc/convert-host';
@@ -9,16 +8,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		host: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		host: { type: 'string' },
 	},
+	required: ['host'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const instance = await Instances.findOne({ host: toPuny(ps.host) });
 
 	if (instance == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/federation/remove-all-following.ts b/packages/backend/src/server/api/endpoints/admin/federation/remove-all-following.ts
index 4de8ad1336..7c2d6dc391 100644
--- a/packages/backend/src/server/api/endpoints/admin/federation/remove-all-following.ts
+++ b/packages/backend/src/server/api/endpoints/admin/federation/remove-all-following.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import deleteFollowing from '@/services/following/delete';
 import { Followings, Users } from '@/models/index';
@@ -8,16 +7,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		host: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		host: { type: 'string' },
 	},
+	required: ['host'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const followings = await Followings.find({
 		followerHost: ps.host,
 	});
diff --git a/packages/backend/src/server/api/endpoints/admin/federation/update-instance.ts b/packages/backend/src/server/api/endpoints/admin/federation/update-instance.ts
index 6ac2f1f467..04cad3b9f7 100644
--- a/packages/backend/src/server/api/endpoints/admin/federation/update-instance.ts
+++ b/packages/backend/src/server/api/endpoints/admin/federation/update-instance.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { Instances } from '@/models/index';
 import { toPuny } from '@/misc/convert-host';
@@ -8,20 +7,19 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		host: {
-			validator: $.str,
-		},
-
-		isSuspended: {
-			validator: $.bool,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		host: { type: 'string' },
+		isSuspended: { type: 'boolean' },
 	},
+	required: ['host', 'isSuspended'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const instance = await Instances.findOne({ host: toPuny(ps.host) });
 
 	if (instance == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/get-index-stats.ts b/packages/backend/src/server/api/endpoints/admin/get-index-stats.ts
index 9a2bccec77..9379379aef 100644
--- a/packages/backend/src/server/api/endpoints/admin/get-index-stats.ts
+++ b/packages/backend/src/server/api/endpoints/admin/get-index-stats.ts
@@ -6,13 +6,16 @@ export const meta = {
 	requireModerator: true,
 
 	tags: ['admin'],
+} as const;
 
-	params: {
-	},
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async () => {
+export default define(meta, paramDef, async () => {
 	const stats = await
 		getConnection().query(`SELECT * FROM pg_indexes;`)
 		.then(recs => {
diff --git a/packages/backend/src/server/api/endpoints/admin/get-table-stats.ts b/packages/backend/src/server/api/endpoints/admin/get-table-stats.ts
index 1c5f250676..28856cd41c 100644
--- a/packages/backend/src/server/api/endpoints/admin/get-table-stats.ts
+++ b/packages/backend/src/server/api/endpoints/admin/get-table-stats.ts
@@ -7,9 +7,6 @@ export const meta = {
 
 	tags: ['admin'],
 
-	params: {
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -22,8 +19,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async () => {
+export default define(meta, paramDef, async () => {
 	const sizes = await
 		getConnection().query(`
 			SELECT relname AS "table", reltuples as "count", pg_total_relation_size(C.oid) AS "size"
diff --git a/packages/backend/src/server/api/endpoints/admin/invite.ts b/packages/backend/src/server/api/endpoints/admin/invite.ts
index 3428709c04..a21777937c 100644
--- a/packages/backend/src/server/api/endpoints/admin/invite.ts
+++ b/packages/backend/src/server/api/endpoints/admin/invite.ts
@@ -9,8 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -26,8 +24,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async () => {
+export default define(meta, paramDef, async () => {
 	const code = rndstr({
 		length: 8,
 		chars: '2-9A-HJ-NP-Z', // [0-9A-Z] w/o [01IO] (32 patterns)
diff --git a/packages/backend/src/server/api/endpoints/admin/moderators/add.ts b/packages/backend/src/server/api/endpoints/admin/moderators/add.ts
index 0308cf2761..6b7e549c35 100644
--- a/packages/backend/src/server/api/endpoints/admin/moderators/add.ts
+++ b/packages/backend/src/server/api/endpoints/admin/moderators/add.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { Users } from '@/models/index';
 
@@ -8,16 +6,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireAdmin: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/moderators/remove.ts b/packages/backend/src/server/api/endpoints/admin/moderators/remove.ts
index bdb976e9ec..585d6fbfa7 100644
--- a/packages/backend/src/server/api/endpoints/admin/moderators/remove.ts
+++ b/packages/backend/src/server/api/endpoints/admin/moderators/remove.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { Users } from '@/models/index';
 
@@ -8,16 +6,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireAdmin: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/promo/create.ts b/packages/backend/src/server/api/endpoints/admin/promo/create.ts
index f2735ac9f8..2ba35306db 100644
--- a/packages/backend/src/server/api/endpoints/admin/promo/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/promo/create.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../../define';
 import { ApiError } from '../../../error';
 import { getNote } from '../../../common/getters';
@@ -11,16 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		noteId: {
-			validator: $.type(ID),
-		},
-
-		expiresAt: {
-			validator: $.num.int(),
-		},
-	},
-
 	errors: {
 		noSuchNote: {
 			message: 'No such note.',
@@ -36,8 +24,17 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		noteId: { type: 'string', format: 'misskey:id' },
+		expiresAt: { type: 'integer' },
+	},
+	required: ['noteId', 'expiresAt'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	const note = await getNote(ps.noteId).catch(e => {
 		if (e.id === '9725d0ce-ba28-4dde-95a7-2cbb2c15de24') throw new ApiError(meta.errors.noSuchNote);
 		throw e;
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/clear.ts b/packages/backend/src/server/api/endpoints/admin/queue/clear.ts
index 3c8e7a27a2..27bb9cc858 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/clear.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/clear.ts
@@ -7,12 +7,16 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {},
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	destroy();
 
 	insertModerationLog(me, 'clearQueue');
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts b/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
index 4760e2c310..38eac5a135 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/deliver-delayed.ts
@@ -8,9 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -35,8 +32,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const jobs = await deliverQueue.getJobs(['delayed']);
 
 	const res = [] as [string, number][];
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts b/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
index a95aabc506..9669cfd3b8 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/inbox-delayed.ts
@@ -8,9 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -35,8 +32,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const jobs = await inboxQueue.getJobs(['delayed']);
 
 	const res = [] as [string, number][];
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/stats.ts b/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
index dab0be5dbc..3f7e6be5fb 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
@@ -7,8 +7,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -33,8 +31,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const deliverJobCounts = await deliverQueue.getJobCounts();
 	const inboxJobCounts = await inboxQueue.getJobCounts();
 	const dbJobCounts = await dbQueue.getJobCounts();
diff --git a/packages/backend/src/server/api/endpoints/admin/relays/add.ts b/packages/backend/src/server/api/endpoints/admin/relays/add.ts
index 65890a00f7..ecf77b87df 100644
--- a/packages/backend/src/server/api/endpoints/admin/relays/add.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/add.ts
@@ -1,5 +1,4 @@
 import { URL } from 'url';
-import $ from 'cafy';
 import define from '../../../define';
 import { addRelay } from '@/services/relay';
 import { ApiError } from '../../../error';
@@ -10,12 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		inbox: {
-			validator: $.str,
-		},
-	},
-
 	errors: {
 		invalidUrl: {
 			message: 'Invalid URL',
@@ -52,8 +45,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		inbox: { type: 'string' },
+	},
+	required: ['inbox'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	try {
 		if (new URL(ps.inbox).protocol !== 'https:') throw 'https only';
 	} catch {
diff --git a/packages/backend/src/server/api/endpoints/admin/relays/list.ts b/packages/backend/src/server/api/endpoints/admin/relays/list.ts
index bdddf13374..6cdaa418a7 100644
--- a/packages/backend/src/server/api/endpoints/admin/relays/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/list.ts
@@ -7,9 +7,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -42,7 +39,13 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	return await listRelay();
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/relays/remove.ts b/packages/backend/src/server/api/endpoints/admin/relays/remove.ts
index 4b04e620c1..d452c2e6a5 100644
--- a/packages/backend/src/server/api/endpoints/admin/relays/remove.ts
+++ b/packages/backend/src/server/api/endpoints/admin/relays/remove.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../../define';
 import { removeRelay } from '@/services/relay';
 
@@ -7,15 +6,17 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		inbox: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		inbox: { type: 'string' },
 	},
+	required: ['inbox'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, user) => {
+export default define(meta, paramDef, async (ps, user) => {
 	return await removeRelay(ps.inbox);
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/reset-password.ts b/packages/backend/src/server/api/endpoints/admin/reset-password.ts
index b6cf1ee2d0..87424782c5 100644
--- a/packages/backend/src/server/api/endpoints/admin/reset-password.ts
+++ b/packages/backend/src/server/api/endpoints/admin/reset-password.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import * as bcrypt from 'bcryptjs';
 import rndstr from 'rndstr';
@@ -11,12 +9,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -31,8 +23,16 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['userId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/resolve-abuse-user-report.ts b/packages/backend/src/server/api/endpoints/admin/resolve-abuse-user-report.ts
index a47b69ec1a..4139f77614 100644
--- a/packages/backend/src/server/api/endpoints/admin/resolve-abuse-user-report.ts
+++ b/packages/backend/src/server/api/endpoints/admin/resolve-abuse-user-report.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { AbuseUserReports, Users } from '@/models/index';
 import { getInstanceActor } from '@/services/instance-actor';
@@ -12,22 +10,19 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		reportId: {
-			validator: $.type(ID),
-		},
-
-		forward: {
-			validator: $.optional.boolean,
-			required: false,
-			default: false,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		reportId: { type: 'string', format: 'misskey:id' },
+		forward: { type: 'boolean', default: false },
 	},
+	required: ['reportId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const report = await AbuseUserReports.findOne(ps.reportId);
 
 	if (report == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/send-email.ts b/packages/backend/src/server/api/endpoints/admin/send-email.ts
index c2972c35fa..2ebe7e0bc9 100644
--- a/packages/backend/src/server/api/endpoints/admin/send-email.ts
+++ b/packages/backend/src/server/api/endpoints/admin/send-email.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { sendEmail } from '@/services/send-email';
 
@@ -7,21 +6,19 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		to: {
-			validator: $.str,
-		},
-		subject: {
-			validator: $.str,
-		},
-		text: {
-			validator: $.str,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		to: { type: 'string' },
+		subject: { type: 'string' },
+		text: { type: 'string' },
 	},
+	required: ['to', 'subject', 'text'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	await sendEmail(ps.to, ps.subject, ps.text, ps.text);
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/server-info.ts b/packages/backend/src/server/api/endpoints/admin/server-info.ts
index cd282e364c..44e069d603 100644
--- a/packages/backend/src/server/api/endpoints/admin/server-info.ts
+++ b/packages/backend/src/server/api/endpoints/admin/server-info.ts
@@ -10,9 +10,6 @@ export const meta = {
 
 	tags: ['admin', 'meta'],
 
-	params: {
-	},
-
 	res: {
 		type: 'object',
 		optional: false, nullable: false,
@@ -90,8 +87,14 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async () => {
+export default define(meta, paramDef, async () => {
 	const memStats = await si.mem();
 	const fsStats = await si.fsSize();
 	const netInterface = await si.networkInterfaceDefault();
diff --git a/packages/backend/src/server/api/endpoints/admin/show-moderation-logs.ts b/packages/backend/src/server/api/endpoints/admin/show-moderation-logs.ts
index 84e2b84bb5..c08acaeca9 100644
--- a/packages/backend/src/server/api/endpoints/admin/show-moderation-logs.ts
+++ b/packages/backend/src/server/api/endpoints/admin/show-moderation-logs.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { ModerationLogs } from '@/models/index';
 import { makePaginationQuery } from '../../common/make-pagination-query';
@@ -10,21 +8,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		sinceId: {
-			validator: $.optional.type(ID),
-		},
-
-		untilId: {
-			validator: $.optional.type(ID),
-		},
-	},
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -65,11 +48,21 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps) => {
+export default define(meta, paramDef, async (ps) => {
 	const query = makePaginationQuery(ModerationLogs.createQueryBuilder('report'), ps.sinceId, ps.untilId);
 
-	const reports = await query.take(ps.limit!).getMany();
+	const reports = await query.take(ps.limit).getMany();
 
 	return await ModerationLogs.packMany(reports);
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/show-user.ts b/packages/backend/src/server/api/endpoints/admin/show-user.ts
index 0d0cc9087a..b883aff494 100644
--- a/packages/backend/src/server/api/endpoints/admin/show-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/show-user.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Users } from '@/models/index';
 
@@ -9,20 +7,22 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
-	},
-
 	res: {
 		type: 'object',
 		nullable: false, optional: false,
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['userId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/show-users.ts b/packages/backend/src/server/api/endpoints/admin/show-users.ts
index d3dde99b72..c373021d0e 100644
--- a/packages/backend/src/server/api/endpoints/admin/show-users.ts
+++ b/packages/backend/src/server/api/endpoints/admin/show-users.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { Users } from '@/models/index';
 
@@ -8,61 +7,6 @@ export const meta = {
 	requireCredential: true,
 	requireModerator: true,
 
-	params: {
-		limit: {
-			validator: $.optional.num.range(1, 100),
-			default: 10,
-		},
-
-		offset: {
-			validator: $.optional.num.min(0),
-			default: 0,
-		},
-
-		sort: {
-			validator: $.optional.str.or([
-				'+follower',
-				'-follower',
-				'+createdAt',
-				'-createdAt',
-				'+updatedAt',
-				'-updatedAt',
-			]),
-		},
-
-		state: {
-			validator: $.optional.str.or([
-				'all',
-				'available',
-				'admin',
-				'moderator',
-				'adminOrModerator',
-				'silenced',
-				'suspended',
-			]),
-			default: 'all',
-		},
-
-		origin: {
-			validator: $.optional.str.or([
-				'combined',
-				'local',
-				'remote',
-			]),
-			default: 'local',
-		},
-
-		username: {
-			validator: $.optional.str,
-			default: null,
-		},
-
-		hostname: {
-			validator: $.optional.str,
-			default: null,
-		},
-	},
-
 	res: {
 		type: 'array',
 		nullable: false, optional: false,
@@ -74,8 +18,22 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
+		offset: { type: 'integer', default: 0 },
+		sort: { type: 'string', enum: ['+follower', '-follower', '+createdAt', '-createdAt', '+updatedAt', '-updatedAt'] },
+		state: { type: 'string', enum: ['all', 'available', 'admin', 'moderator', 'adminOrModerator', 'silenced', 'suspended'], default: "all" },
+		origin: { type: 'string', enum: ['combined', 'local', 'remote'], default: "local" },
+		username: { type: 'string', default: null },
+		hostname: { type: 'string', default: null },
+	},
+	required: [],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const query = Users.createQueryBuilder('user');
 
 	switch (ps.state) {
@@ -111,7 +69,7 @@ export default define(meta, async (ps, me) => {
 		default: query.orderBy('user.id', 'ASC'); break;
 	}
 
-	query.take(ps.limit!);
+	query.take(ps.limit);
 	query.skip(ps.offset);
 
 	const users = await query.getMany();
diff --git a/packages/backend/src/server/api/endpoints/admin/silence-user.ts b/packages/backend/src/server/api/endpoints/admin/silence-user.ts
index 872bd2a6ac..df547184ad 100644
--- a/packages/backend/src/server/api/endpoints/admin/silence-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/silence-user.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Users } from '@/models/index';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -9,16 +7,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/suspend-user.ts b/packages/backend/src/server/api/endpoints/admin/suspend-user.ts
index 2bb1875fc0..31867a4055 100644
--- a/packages/backend/src/server/api/endpoints/admin/suspend-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/suspend-user.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import deleteFollowing from '@/services/following/delete';
 import { Users, Followings, Notifications } from '@/models/index';
@@ -13,16 +11,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/unsilence-user.ts b/packages/backend/src/server/api/endpoints/admin/unsilence-user.ts
index a4c6ff2ade..42c7e776a8 100644
--- a/packages/backend/src/server/api/endpoints/admin/unsilence-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/unsilence-user.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Users } from '@/models/index';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -9,16 +7,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/unsuspend-user.ts b/packages/backend/src/server/api/endpoints/admin/unsuspend-user.ts
index 5ab56d51c7..011f485277 100644
--- a/packages/backend/src/server/api/endpoints/admin/unsuspend-user.ts
+++ b/packages/backend/src/server/api/endpoints/admin/unsuspend-user.ts
@@ -1,5 +1,3 @@
-import $ from 'cafy';
-import { ID } from '@/misc/cafy-id';
 import define from '../../define';
 import { Users } from '@/models/index';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -10,16 +8,18 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		userId: {
-			validator: $.type(ID),
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
 	},
+	required: ['userId'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const user = await Users.findOne(ps.userId as string);
 
 	if (user == null) {
diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index 1764d230a3..b845eb4d5b 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -1,310 +1,107 @@
-import $ from 'cafy';
 import define from '../../define';
 import { getConnection } from 'typeorm';
 import { Meta } from '@/models/entities/meta';
 import { insertModerationLog } from '@/services/insert-moderation-log';
 import { DB_MAX_NOTE_TEXT_LENGTH } from '@/misc/hard-limits';
-import { ID } from '@/misc/cafy-id';
 
 export const meta = {
 	tags: ['admin'],
 
 	requireCredential: true,
 	requireAdmin: true,
+} as const;
 
-	params: {
-		disableRegistration: {
-			validator: $.optional.nullable.bool,
-		},
-
-		disableLocalTimeline: {
-			validator: $.optional.nullable.bool,
-		},
-
-		disableGlobalTimeline: {
-			validator: $.optional.nullable.bool,
-		},
-
-		useStarForReactionFallback: {
-			validator: $.optional.nullable.bool,
-		},
-
-		pinnedUsers: {
-			validator: $.optional.nullable.arr($.str),
-		},
-
-		hiddenTags: {
-			validator: $.optional.nullable.arr($.str),
-		},
-
-		blockedHosts: {
-			validator: $.optional.nullable.arr($.str),
-		},
-
-		themeColor: {
-			validator: $.optional.nullable.str,
-		},
-
-		mascotImageUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		bannerUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		errorImageUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		iconUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		backgroundImageUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		logoImageUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		name: {
-			validator: $.optional.nullable.str,
-		},
-
-		description: {
-			validator: $.optional.nullable.str,
-		},
-
-		maxNoteTextLength: {
-			validator: $.optional.num.min(0).max(DB_MAX_NOTE_TEXT_LENGTH),
-		},
-
-		localDriveCapacityMb: {
-			validator: $.optional.num.min(0),
-		},
-
-		remoteDriveCapacityMb: {
-			validator: $.optional.num.min(0),
-		},
-
-		cacheRemoteFiles: {
-			validator: $.optional.bool,
-		},
-
-		proxyRemoteFiles: {
-			validator: $.optional.bool,
-		},
-
-		emailRequiredForSignup: {
-			validator: $.optional.bool,
-		},
-
-		enableHcaptcha: {
-			validator: $.optional.bool,
-		},
-
-		hcaptchaSiteKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		hcaptchaSecretKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		enableRecaptcha: {
-			validator: $.optional.bool,
-		},
-
-		recaptchaSiteKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		recaptchaSecretKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		proxyAccountId: {
-			validator: $.optional.nullable.type(ID),
-		},
-
-		maintainerName: {
-			validator: $.optional.nullable.str,
-		},
-
-		maintainerEmail: {
-			validator: $.optional.nullable.str,
-		},
-
-		pinnedPages: {
-			validator: $.optional.arr($.str),
-		},
-
-		pinnedClipId: {
-			validator: $.optional.nullable.type(ID),
-		},
-
-		langs: {
-			validator: $.optional.arr($.str),
-		},
-
-		summalyProxy: {
-			validator: $.optional.nullable.str,
-		},
-
-		deeplAuthKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		deeplIsPro: {
-			validator: $.optional.bool,
-		},
-
-		enableTwitterIntegration: {
-			validator: $.optional.bool,
-		},
-
-		twitterConsumerKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		twitterConsumerSecret: {
-			validator: $.optional.nullable.str,
-		},
-
-		enableGithubIntegration: {
-			validator: $.optional.bool,
-		},
-
-		githubClientId: {
-			validator: $.optional.nullable.str,
-		},
-
-		githubClientSecret: {
-			validator: $.optional.nullable.str,
-		},
-
-		enableDiscordIntegration: {
-			validator: $.optional.bool,
-		},
-
-		discordClientId: {
-			validator: $.optional.nullable.str,
-		},
-
-		discordClientSecret: {
-			validator: $.optional.nullable.str,
-		},
-
-		enableEmail: {
-			validator: $.optional.bool,
-		},
-
-		email: {
-			validator: $.optional.nullable.str,
-		},
-
-		smtpSecure: {
-			validator: $.optional.bool,
-		},
-
-		smtpHost: {
-			validator: $.optional.nullable.str,
-		},
-
-		smtpPort: {
-			validator: $.optional.nullable.num,
-		},
-
-		smtpUser: {
-			validator: $.optional.nullable.str,
-		},
-
-		smtpPass: {
-			validator: $.optional.nullable.str,
-		},
-
-		enableServiceWorker: {
-			validator: $.optional.bool,
-		},
-
-		swPublicKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		swPrivateKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		tosUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		repositoryUrl: {
-			validator: $.optional.str,
-		},
-
-		feedbackUrl: {
-			validator: $.optional.str,
-		},
-
-		useObjectStorage: {
-			validator: $.optional.bool,
-		},
-
-		objectStorageBaseUrl: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStorageBucket: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStoragePrefix: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStorageEndpoint: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStorageRegion: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStoragePort: {
-			validator: $.optional.nullable.num,
-		},
-
-		objectStorageAccessKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStorageSecretKey: {
-			validator: $.optional.nullable.str,
-		},
-
-		objectStorageUseSSL: {
-			validator: $.optional.bool,
-		},
-
-		objectStorageUseProxy: {
-			validator: $.optional.bool,
-		},
-
-		objectStorageSetPublicRead: {
-			validator: $.optional.bool,
-		},
-
-		objectStorageS3ForcePathStyle: {
-			validator: $.optional.bool,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		disableRegistration: { type: 'boolean', nullable: true },
+		disableLocalTimeline: { type: 'boolean', nullable: true },
+		disableGlobalTimeline: { type: 'boolean', nullable: true },
+		useStarForReactionFallback: { type: 'boolean', nullable: true },
+		pinnedUsers: { type: 'array', nullable: true, items: {
+			type: 'string',
+		} },
+		hiddenTags: { type: 'array', nullable: true, items: {
+			type: 'string',
+		} },
+		blockedHosts: { type: 'array', nullable: true, items: {
+			type: 'string',
+		} },
+		themeColor: { type: 'string', nullable: true },
+		mascotImageUrl: { type: 'string', nullable: true },
+		bannerUrl: { type: 'string', nullable: true },
+		errorImageUrl: { type: 'string', nullable: true },
+		iconUrl: { type: 'string', nullable: true },
+		backgroundImageUrl: { type: 'string', nullable: true },
+		logoImageUrl: { type: 'string', nullable: true },
+		name: { type: 'string', nullable: true },
+		description: { type: 'string', nullable: true },
+		maxNoteTextLength: { type: 'integer', maximum: 8192 },
+		localDriveCapacityMb: { type: 'integer' },
+		remoteDriveCapacityMb: { type: 'integer' },
+		cacheRemoteFiles: { type: 'boolean' },
+		proxyRemoteFiles: { type: 'boolean' },
+		emailRequiredForSignup: { type: 'boolean' },
+		enableHcaptcha: { type: 'boolean' },
+		hcaptchaSiteKey: { type: 'string', nullable: true },
+		hcaptchaSecretKey: { type: 'string', nullable: true },
+		enableRecaptcha: { type: 'boolean' },
+		recaptchaSiteKey: { type: 'string', nullable: true },
+		recaptchaSecretKey: { type: 'string', nullable: true },
+		proxyAccountId: { type: 'string', format: 'misskey:id', nullable: true },
+		maintainerName: { type: 'string', nullable: true },
+		maintainerEmail: { type: 'string', nullable: true },
+		pinnedPages: { type: 'array', items: {
+			type: 'string',
+		} },
+		pinnedClipId: { type: 'string', format: 'misskey:id', nullable: true },
+		langs: { type: 'array', items: {
+			type: 'string',
+		} },
+		summalyProxy: { type: 'string', nullable: true },
+		deeplAuthKey: { type: 'string', nullable: true },
+		deeplIsPro: { type: 'boolean' },
+		enableTwitterIntegration: { type: 'boolean' },
+		twitterConsumerKey: { type: 'string', nullable: true },
+		twitterConsumerSecret: { type: 'string', nullable: true },
+		enableGithubIntegration: { type: 'boolean' },
+		githubClientId: { type: 'string', nullable: true },
+		githubClientSecret: { type: 'string', nullable: true },
+		enableDiscordIntegration: { type: 'boolean' },
+		discordClientId: { type: 'string', nullable: true },
+		discordClientSecret: { type: 'string', nullable: true },
+		enableEmail: { type: 'boolean' },
+		email: { type: 'string', nullable: true },
+		smtpSecure: { type: 'boolean' },
+		smtpHost: { type: 'string', nullable: true },
+		smtpPort: { type: 'integer', nullable: true },
+		smtpUser: { type: 'string', nullable: true },
+		smtpPass: { type: 'string', nullable: true },
+		enableServiceWorker: { type: 'boolean' },
+		swPublicKey: { type: 'string', nullable: true },
+		swPrivateKey: { type: 'string', nullable: true },
+		tosUrl: { type: 'string', nullable: true },
+		repositoryUrl: { type: 'string' },
+		feedbackUrl: { type: 'string' },
+		useObjectStorage: { type: 'boolean' },
+		objectStorageBaseUrl: { type: 'string', nullable: true },
+		objectStorageBucket: { type: 'string', nullable: true },
+		objectStoragePrefix: { type: 'string', nullable: true },
+		objectStorageEndpoint: { type: 'string', nullable: true },
+		objectStorageRegion: { type: 'string', nullable: true },
+		objectStoragePort: { type: 'integer', nullable: true },
+		objectStorageAccessKey: { type: 'string', nullable: true },
+		objectStorageSecretKey: { type: 'string', nullable: true },
+		objectStorageUseSSL: { type: 'boolean' },
+		objectStorageUseProxy: { type: 'boolean' },
+		objectStorageSetPublicRead: { type: 'boolean' },
+		objectStorageS3ForcePathStyle: { type: 'boolean' },
 	},
+	required: [],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const set = {} as Partial<Meta>;
 
 	if (typeof ps.disableRegistration === 'boolean') {
diff --git a/packages/backend/src/server/api/endpoints/admin/vacuum.ts b/packages/backend/src/server/api/endpoints/admin/vacuum.ts
index 4229ef0d29..07a4517bd4 100644
--- a/packages/backend/src/server/api/endpoints/admin/vacuum.ts
+++ b/packages/backend/src/server/api/endpoints/admin/vacuum.ts
@@ -1,4 +1,3 @@
-import $ from 'cafy';
 import define from '../../define';
 import { getConnection } from 'typeorm';
 import { insertModerationLog } from '@/services/insert-moderation-log';
@@ -8,19 +7,19 @@ export const meta = {
 
 	requireCredential: true,
 	requireModerator: true,
+} as const;
 
-	params: {
-		full: {
-			validator: $.bool,
-		},
-		analyze: {
-			validator: $.bool,
-		},
+const paramDef = {
+	type: 'object',
+	properties: {
+		full: { type: 'boolean' },
+		analyze: { type: 'boolean' },
 	},
+	required: ['full', 'analyze'],
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const params: string[] = [];
 
 	if (ps.full) {