diff --git a/src/flags.c b/src/flags.c
new file mode 100644
index 0000000..58311ac
--- /dev/null
+++ b/src/flags.c
@@ -0,0 +1,155 @@
+#include "flags.h"
+#include "lib.h"
+#include "stream.h"
+
+#include <strings.h>
+
+static format_t get_file_extension(char *path) {
+	char *filename = strrchr(path, '/');
+	if (filename == NULL)
+		return NBT;
+	char *extension = strrchr(filename, '.');
+	if (extension == NULL)
+		return NBT;
+	else if (strcasecmp(extension, "json") == 0)
+		return JSON;
+	else if (strcasecmp(extension, "snbt") == 0)
+		return SNBT;
+	return NBT;
+}
+
+void parse_long_arg(flags_t *flags, char *arg) {
+
+	char *key = arg + 2;
+	char *value = strchr(key, '=');
+	if (value != NULL) {
+		*value = '\0';
+		value++;
+	}
+
+	if (strcmp(key, "help") == 0) {
+		flags->help = true;
+		return;
+	}
+
+	else if (strcmp(key, "version") == 0) {
+		flags->version = true;
+		return;
+	}
+
+	else if (strcmp(key, "in") == 0) {
+		if (value == NULL)
+			error_and_die("--in requires a value\n");
+		flags->in = stream_open(value, "r");
+		if (flags->__set_fin == false)
+			flags->fin = get_file_extension(value);
+	}
+	
+	else if (strcmp(key, "out") == 0) {
+		if (value == NULL)
+			error_and_die("--out requires a value\n");
+		flags->out = stream_open(value, "w");
+		if (flags->__set_fout == false)
+			flags->fout = get_file_extension(value);
+	}
+
+	else {
+		error_and_die("invalid argument '--%s'\n", key);
+	}
+
+}
+
+void parse_short_args(flags_t *flags, char *arg, int len) {
+	for (int i = 1; i < len; i++) {
+		char c = arg[i];
+		switch(c) {
+			case 'j':
+				flags->fin = JSON;
+				flags->__set_fin = true;
+				break;
+			case 'J':
+				flags->fout = JSON;
+				flags->__set_fout = true;
+				break;
+			case 's':
+				flags->fin = SNBT;
+				break;
+			case 'S':
+				flags->fout = SNBT;
+				break;
+			case 'n':
+				flags->fin = NBT;
+				break;
+			case 'N':
+				flags->fout = NBT;
+				break;
+			case 'h':
+				flags->help = true;
+				break;
+			case 'v':
+				flags->version = true;
+				break;
+			default:
+				error_and_die("invalid argument: '-%c'\n", c);
+		}
+	}
+}
+
+void parse_arg(flags_t *flags, char *arg, int len) {
+	if (len < 2) {
+		error_and_die("invalid argument: '%s'\n", arg);
+	} else if (arg[1] == '-') {
+		parse_long_arg(flags, arg);
+	} else {
+		parse_short_args(flags, arg, len);
+	}
+}
+
+void parse_flags(flags_t *flags, int argc, char **argv) {
+
+	flags->__set_fin = false;
+	flags->__set_fout = false;
+	flags->help = false;
+	flags->version = false;
+	flags->in.__file = stdin;
+	flags->in.__alloc = false;
+	flags->out.__file = stdout;
+	flags->out.__alloc = false;
+	flags->fin = NBT;
+	flags->fout = NBT;
+
+	int i;
+
+	for (i = 1; i < argc; i++) {
+		char *arg = argv[i];
+		int len = strlen(arg);
+	
+		if (len == 2 && arg[0] == '-' && arg[1] == '-') {
+			break;
+		} else if (arg[0] != '-') {
+			i--;
+			break;
+		} else {
+			parse_arg(flags, arg, len);
+		}
+	}
+
+	if (i + 1 < argc) {
+		char *arg = argv[i + 1];
+		flags->in = stream_open(arg, "r");
+		if (flags->__set_fin == false)
+			flags->fin = get_file_extension(arg);
+	}
+	
+	if (i + 2 < argc) {
+		char *arg = argv[i + 2];
+		flags->out = stream_open(arg, "w");
+		if (flags->__set_fout == false)
+			flags->fout = get_file_extension(arg);
+	}
+
+	if (i + 3 < argc) {
+		error_and_die("too many arguments passed\n");
+	}
+
+}
diff --git a/src/flags.h b/src/flags.h
new file mode 100644
index 0000000..a14580b
--- /dev/null
+++ b/src/flags.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "tag.h"
+#include "stream.h"
+
+typedef struct {
+	stream_t in;
+	stream_t out;
+	format_t fin;
+	format_t fout;
+	bool help;
+	bool version;
+	bool __set_fin;
+	bool __set_fout;
+} flags_t;
+
+void parse_flags(flags_t *flags, int argc, char **argv);
diff --git a/src/json/json.h b/src/json/json.h
new file mode 100644
index 0000000..73b4f52
--- /dev/null
+++ b/src/json/json.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include "../tag.h"
+#include "../stream.h"
+
+bool json_read(tag_t *tag, const stream_t *stream);
+bool json_print(const tag_t *tag, const stream_t *stream);
diff --git a/src/json/print.c b/src/json/print.c
new file mode 100644
index 0000000..e8b6996
--- /dev/null
+++ b/src/json/print.c
@@ -0,0 +1,173 @@
+#include "json.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+static char buf[1024];
+
+__attribute__((format(printf, 3, 4)))
+static bool printi(const stream_t *stream, int depth, const char *format, ...) {
+	for (int i = 0; i < depth; i++)
+		if (stream_write(stream, "\t", 1) == false)
+			return false;
+	va_list list;
+	va_start(list, format);
+	int len;
+	if ((len = vsnprintf(buf, 1024, format, list)) < 0)
+		return false;
+	if (stream_write(stream, buf, len) == false)
+		return false;
+	return true;
+}
+
+static bool json_print_impl(const tag_t *tag, const stream_t *stream, int depth);
+
+static bool json_print_byte_array(const tagdata_t *data, const stream_t *stream) {
+	if (printi(stream, 0, "[") == false)
+		return false;
+	for (int32_t i = 0; i < data->b_arr.size; i++) {
+		if (i != 0) 
+			if (printi(stream, 0, ",") == false)
+				return false;
+		if (printi(stream, 0, "%hhd", data->b_arr.data[i]) == false)
+			return false;
+	}
+	if (printi(stream, 0, "]") == false)
+		return false;
+	return true;
+}
+
+static bool json_print_int_array(const tagdata_t *data, const stream_t *stream) {
+	if (printi(stream, 0, "[") == false)
+		return false;
+	for (int32_t i = 0; i < data->i_arr.size; i++) {
+		if (i != 0) 
+			if (printi(stream, 0, ",") == false)
+				return false;
+		if (printi(stream, 0, "%d", data->i_arr.data[i]) == false)
+			return false;
+	}
+	if (printi(stream, 0, "]") == false)
+		return false;
+	return true;
+}
+
+static bool json_print_long_array(const tagdata_t *data, const stream_t *stream) {
+	if (printi(stream, 0, "[") == false)
+		return false;
+	for (int32_t i = 0; i < data->l_arr.size; i++) {
+		if (i != 0) 
+			if (printi(stream, 0, ",") == false)
+				return false;
+		if (printi(stream, 0, "%ld", data->l_arr.data[i]) == false)
+			return false;
+	}
+	if (printi(stream, 0, "]") == false)
+		return false;
+	return true;
+}
+
+static bool json_print_string(const tagdata_t *data, const stream_t *stream) {
+	if (data->string.size > 1) {
+		if (printi(stream, 0, "\"%.*s\"", data->string.size, data->string.data) == false)
+			return false;
+	} else {
+		if (printi(stream, 0, "\"\"") == false)
+			return false;
+	}
+	return true;
+}
+
+static bool json_print_compound(const tagdata_t *data, const stream_t *stream, int depth) {
+	if (printi(stream, 0, "{\n") == false)
+		return false;
+	for (int32_t i = 0; i < data->compound.size; i++) {
+		if (i != 0 && printi(stream, 0, ",\n") == false)
+			return false;
+		if (json_print_impl(&data->compound.tags[i], stream, depth + 1) == false)
+			return false;
+	}
+	if (printi(stream, 0, "\n") == false || printi(stream, depth, "}") == false)
+		return false;
+	return true;
+}
+
+static bool json_print_list(const tagdata_t *data, const stream_t *stream, int depth) {
+	if (printi(stream, 0, "[\n") == false)
+		return false;
+	for (int32_t i = 0; i < data->list.size; i++) {
+		if (i != 0 && printi(stream, 0, ",\n") == false)
+			return false;
+		if (json_print_impl(&data->list.tags[i], stream, depth + 1) == false)
+			return false;
+	}
+	if (printi(stream, 0, "\n") == false || printi(stream, depth, "]") == false)
+		return false;
+	return true;
+}
+
+static bool json_print_data(const tag_t *tag, const stream_t *stream, int depth) {
+
+	bool ok = true;
+
+	switch (tag->type) {
+        case TAG_BYTE:
+			ok = printi(stream, 0, "%hhd", tag->data.b);
+			break;
+        case TAG_SHORT:
+			ok = printi(stream, 0, "%hd", tag->data.s);
+			break;
+        case TAG_INT:
+			ok = printi(stream, 0, "%d", tag->data.i);
+			break;
+        case TAG_LONG:
+			ok = printi(stream, 0, "%ld", tag->data.l);
+			break;
+        case TAG_FLOAT:
+			ok = printi(stream, 0, "%f", tag->data.f);
+			break;
+        case TAG_DOUBLE:
+			ok = printi(stream, 0, "%lf", tag->data.d);
+			break;
+        case TAG_BYTE_ARRAY:
+			ok = json_print_byte_array(&tag->data, stream);
+			break;
+        case TAG_STRING:
+			ok = json_print_string(&tag->data, stream);
+			break;
+        case TAG_LIST:
+			ok = json_print_list(&tag->data, stream, depth);
+			break;
+        case TAG_COMPOUND:
+			ok = json_print_compound(&tag->data, stream, depth);
+			break;
+        case TAG_INT_ARRAY:
+			ok = json_print_int_array(&tag->data, stream);
+			break;
+        case TAG_LONG_ARRAY:
+			ok = json_print_long_array(&tag->data, stream);
+			break;
+        case TAG_END:
+            break;
+        }
+
+	return ok;
+}
+
+static bool json_print_impl(const tag_t *tag, const stream_t *stream, int depth) {
+	if (tag->name_len > 0) {
+		printi(stream, depth, "\"%.*s\":\t", tag->name_len, tag->name);
+	} else {
+		for (int i = 0; i < depth; i++) 
+			printi(stream, 0, "\t");
+	}
+	return json_print_data(tag, stream, depth);
+}
+
+bool json_print(const tag_t *tag, const stream_t *stream) {
+	if (json_print_impl(tag, stream, 0) == false)
+		return false;
+	if (stream_write(stream, "\n", 1) == false)
+		return false;
+	return true;
+}
diff --git a/src/json/read.c b/src/json/read.c
new file mode 100644
index 0000000..9b75597
--- /dev/null
+++ b/src/json/read.c
@@ -0,0 +1,634 @@
+#include "json.h"
+#include "../lib.h"
+
+#include <ctype.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static char ret = '\0';
+
+typedef enum {
+	TOK_LBRACE,
+	TOK_RBRACE,
+	TOK_LBRACK,
+	TOK_RBRACK,
+	TOK_COLON,
+	TOK_COMMA,
+	TOK_STRING,
+	TOK_NUMBER,
+	TOK_DOUBLE,
+	TOK_BOOL,
+	TOK_NULL
+} tokentype_t ;
+
+typedef union {
+	bool b;
+	int64_t number;
+	double decimal;
+	struct {
+		uint16_t len;
+		char *data;
+	} string;
+} tokendata_t;
+
+typedef struct {
+	tokentype_t type;
+	tokendata_t data;
+} token_t;
+
+static void json_token_free(token_t *token) {
+	if (token->type == TOK_STRING)
+		free(token->data.string.data);
+}
+
+static bool json_parse_unicode(char buf[4], int *read, const stream_t *stream) {
+	char temp[5];
+	temp[4] = '\0';
+	
+	if (stream_read(stream, temp, 4) == false)
+		return false;
+
+	uint16_t code_point;
+	char *end = NULL;
+	
+	code_point = strtol(temp, &end, 16);
+	
+	if (end != NULL)
+		return false;
+
+	int lead1		= 0b00000000;
+	int lead2		= 0b11000000;
+	int lead3		= 0b11100000;
+	int cont		= 0b10000000;
+	int contmask   = 0b00111111;
+
+	if (code_point < 0x0080) {
+		buf[0] = ((code_point >> 0)) | lead1;
+		*read = 1;
+	} else if (code_point < 0x0800) {
+		buf[0] = ((code_point >> 6)) | lead2;
+		buf[1] = ((code_point >> 0) & contmask) | cont;
+		*read = 2;
+	} else {
+		buf[0] = ((code_point >> 12)) | lead3;
+		buf[1] = ((code_point >> 6) & contmask) | cont;
+		buf[2] = ((code_point >> 0) & contmask) | cont;
+		*read = 3;
+	}
+
+	return true;
+}
+
+static bool json_parse_escape(char buf[4], int *read, const stream_t *stream) {
+	char n;
+	
+	char *c = &buf[0];
+	*read = 1;
+
+	if (stream_read(stream, &n, 1) == false)
+		return false;
+
+	switch (n) {
+		case '"':
+		case '\\':
+		case '/':
+			*c = n;
+			return true;
+		case 'b':
+			*c = '\b';
+			return true;
+		case 'f':
+			*c = '\f';
+			return true;
+		case 'n':
+			*c = '\n';
+			return true;
+		case 'r':
+			*c = '\r';
+			return true;
+		case 't':
+			*c = '\t';
+			return true;
+		case 'u': {
+			return json_parse_unicode(buf, read, stream);
+		default:
+			// invalid escape
+			return false;
+		};
+	}
+}
+
+static bool json_parse_string(tokendata_t *token, const stream_t *stream) {
+	
+	int capacity = 8;
+	int len = 0;
+	char *buf = xalloc(capacity * sizeof(char));
+
+	while (1) {
+
+		char tmp[4];
+		int read = 1;
+
+		if (stream_read(stream, tmp, 1) == false) {
+			free(buf);
+			return false;
+		}
+
+		uint8_t c = tmp[0];
+
+		if (c == '"')
+			break;
+
+		// non printable ascii character
+		if (c < 32 || c > 127) {
+			free(buf);
+			return false;
+		}
+		// an escape, dont push to buffer, get next char
+		if (c == '\\' && json_parse_escape(tmp, &read, stream) == false) {
+			free(buf);
+			return false;
+		}
+
+		if (len + read >= capacity) {
+			capacity *= 2;
+			buf = xrealloc(buf, capacity);
+		}
+
+		memcpy(buf + len, tmp, read);
+		len += read;
+
+	}
+
+	token->string.data = xalloc(len * sizeof(char));
+	token->string.len = len;
+	memcpy(token->string.data, buf, len);
+	free(buf);
+
+	return true;
+}
+
+static bool json_parse_ident(token_t *token, const stream_t *stream, char first) {
+
+	char buf[4];
+	buf[3] = '\0';
+
+	if (stream_read(stream, buf, 3) == false)
+		return false;
+
+	if (first == 't' && strcmp(buf, "rue") == 0) {
+		token->type = TOK_BOOL;
+		token->data.b = true;
+	} else if (first == 'f' && strcmp(buf, "als") == 0) {
+		if (stream_read(stream, buf, 1) == false)
+			return false;
+		if (*buf != 'e')
+			return false;
+		token->type = TOK_BOOL;
+		token->data.b = false;
+	} else if (first == 'n' && strcmp(buf, "ull") == 0) {
+		token->type = TOK_NULL;
+	} else {
+		return false;
+	}
+
+	return true;
+}
+
+static void push_char(char **buf, int *len, int *cap, char c) {
+	if (*len == *cap) {
+		*cap *= *cap * 2;
+		*buf = xrealloc(*buf, *cap * sizeof(char));
+	}
+	(*buf)[(*len)++] = c;
+}
+
+static bool json_parse_number(token_t *token, const stream_t *stream, char first) {
+
+	int capacity = 8;
+	int len = 0; 
+	char *buf = xalloc(capacity * sizeof(char));
+	bool isdec = false;
+	bool isneg = false;
+
+	char c = first;
+
+	// PARSE DIGITS AND NEGATIVITY
+
+	while (1) {
+		if (c == '\0' && stream_read(stream, &c, 1) == false) {
+			free(buf);
+			return false;
+		}
+
+		if (c == '-' && isneg) { 
+			// cannot negate twice
+			free(buf);
+			return false;
+		} else if (c == '-') {
+			isneg = true;
+			c = '\0';
+		} else if (c == '0' && len == 0) { 
+			// string starting with 0 cannot not have other digits
+			push_char(&buf, &len, &capacity, c);
+			c = '\0';
+			break;
+		} else if (c >= '0' && c <= '9') {
+			push_char(&buf, &len, &capacity, c);
+			c = '\0';
+		} else if (len == 0) {
+			// invalid start of digits
+			free(buf);
+			return false;
+		} else {
+			// end of starting digits
+			break;
+		}
+	}
+
+	// SET NEXT CHAR C IF NOT READ YET
+
+	if (c == '\0' && stream_read(stream, &c, 1) == false) {
+		free(buf);
+		return false;
+	}
+
+	// THERE IS A DECIMAL
+	// READ STREAM OF DIGITS
+
+	if (c == '.') {
+		isdec = true;
+		push_char(&buf,  &len, &capacity, c);
+		int declen = 0;
+		while (1) {
+			if (stream_read(stream, &c, 1) == false) {
+				free(buf);
+				return false;
+			}
+			if (c >= '0' && c <= '9') {
+				push_char(&buf,  &len, &capacity, c);
+				declen++;
+			} else if (declen == 0) {
+				// invalid decimal
+				free(buf);
+				return false;
+			} else {
+				// end of decimal
+				break;
+			}
+		}
+	}
+
+	// PARSE EXPONENT
+	if (c == 'e' || c == 'E') {
+		isdec = true;
+		push_char(&buf, &len, &capacity, 'E');
+
+		int explen = 0; // the exponent len
+
+		if (stream_read(stream, &c, 1) == false) {
+			free(buf);
+			return false;
+		}
+
+		if (c == '+' || c == '-') {
+			push_char(&buf, &len, &capacity, c);
+			c = '\0';
+		}
+
+		while (1) {
+			if (c == '\0' && stream_read(stream, &c, 1) == false) {
+				free(buf);
+				return false;
+			}
+
+			if (c >= '0' && c <= '9') {
+				push_char(&buf, &len, &capacity, c);
+				explen++;
+				c = '\0';
+			} else if (explen == 0) {
+				// invalid exponent
+				free(buf);
+				return false;
+			} else {
+				break;
+			}
+		}
+
+	}
+
+	char *end = NULL;
+	push_char(&buf, &len, &capacity, '\0');
+
+	if (isdec) {
+		token->type = TOK_DOUBLE;
+		token->data.decimal = strtod(buf, &end);
+	} else {
+		token->type = TOK_NUMBER;
+		token->data.number = strtol(buf, &end, 10);
+	}
+
+	if (end != NULL && *end != 0)
+		return false;
+	
+	free(buf);
+
+	ret = c;
+	return true;
+}
+
+static bool json_next_token(token_t *token, const stream_t *stream) {
+
+	memset(token, 0, sizeof(token_t));
+
+	char c;
+
+retry:
+
+	if (ret != '\0') {
+		c = ret;
+		ret = '\0';
+	} else if (stream_read(stream, &c, 1) == false) {
+		return false;
+	}
+
+	bool ok = true;
+
+	switch (c) {
+		case '{':
+			token->type = TOK_LBRACE;
+			break;
+		case '}':
+			token->type = TOK_RBRACE;
+			break;
+		case '[':
+			token->type = TOK_LBRACK;
+			break;
+		case ']':
+			token->type = TOK_RBRACK;
+			break;
+		case ':':
+			token->type = TOK_COLON;
+			break;
+		case ',':
+			token->type = TOK_COMMA;
+			break;
+		case '"':
+			token->type = TOK_STRING;
+			ok = json_parse_string(&token->data, stream);
+			break;
+		case 't':
+		case 'f':
+		case 'n':
+			// parse null or bool
+			ok = json_parse_ident(token, stream, c);
+			break;
+		case ' ':
+		case '\n':
+		case '\t':
+		case '\r':
+			goto retry;
+		default:
+			if (isdigit(c) || c == '-') {
+				// parse number
+				ok = json_parse_number(token, stream, c);
+			} else {
+				// disallowed symbol
+				ok = false;
+			}
+			break;
+	}
+
+	return ok;
+}
+
+static bool json_get_list_type(tagtype_t *type, const tag_t *tags, int len) {
+	if (len < 1) {
+		*type = TAG_END;
+		return true;
+	}
+
+	*type = tags[0].type;
+
+	for (int i = 0; i < len; i++)
+		if (tags[i].type != *type)
+			return false;
+
+	return true;
+}
+
+static bool json_read_value(tag_t *tag, const stream_t *stream, token_t *first);
+
+static bool json_read_list(tagdata_t *data, const stream_t *stream) {
+
+	token_t next = {0};
+	if (json_next_token(&next, stream) == false) {
+		json_token_free(&next);
+		return false;
+	}
+
+	token_t *ret = &next;
+
+	if (next.type == TOK_RBRACK) {
+		data->list.tags = NULL;
+		data->list.size = 0;
+		data->list.type = TAG_END;
+		return true;
+	}
+
+	int capacity = 8;
+	int len = 0;
+	tag_t *tags = xalloc(capacity * sizeof(tag_t));
+
+	while (1) {
+
+		tag_t value;
+		value.name = "";
+		value.name_len = 0;
+		
+		if (json_read_value(&value, stream, ret) == false) {
+			free(tags);
+			return false;
+		}
+
+		ret = NULL;
+		
+		if (len == capacity) {
+			capacity *= 2;
+			tags = xrealloc(tags, capacity * sizeof(tag_t));
+		}
+
+		tags[len++] = value;
+
+		if (json_next_token(&next, stream) == false) {
+			free(tags);
+			json_token_free(&next);
+			return false;
+		}
+
+		if (next.type == TOK_COMMA) {
+			continue;
+		} else if (next.type == TOK_RBRACK) {
+			break;
+		} else {
+			free(tags);
+			json_token_free(&next);
+			return false;
+		}
+
+	}
+
+	tagtype_t type;
+	if (json_get_list_type(&type, tags, len) == false) {
+		free(tags);
+		return false;
+	}
+
+	data->list.type = type;
+	data->list.size = len;
+	data->list.tags = xalloc(len * sizeof(tag_t));
+	memcpy(data->list.tags, tags, len * sizeof(tag_t));
+	free(tags);
+
+	return true;
+
+}
+
+static bool json_read_compound(tagdata_t *data, const stream_t *stream) {
+	
+	token_t next = {0};
+	if (json_next_token(&next, stream) == false) {
+		json_token_free(&next);
+		return false;
+	}
+
+	if (next.type == TOK_RBRACE) {
+		data->compound.tags = NULL;
+		data->compound.size = 0;
+		return true;
+	}
+
+	int capacity = 8;
+	int len = 0;
+	tag_t *tags = xalloc(capacity * sizeof(tag_t));
+
+	while (1) {
+
+		if (next.type != TOK_STRING) {
+			free(tags);
+			json_token_free(&next);
+			return false;
+		}
+
+		char *name = next.data.string.data;
+		int name_len = next.data.string.len;
+		
+		if (json_next_token(&next, stream) == false || next.type != TOK_COLON) {
+			free(tags);
+			free(name);
+			return false;
+		}
+		
+		tag_t value;
+		if (json_read_value(&value, stream, NULL) == false) {
+			free(tags);
+			free(name);
+			return false;
+		}
+
+		value.name = name;
+		value.name_len = name_len;
+
+		if (len == capacity) {
+			capacity *= 2;
+			tags = xrealloc(tags, capacity * sizeof(tag_t));
+		}
+
+		tags[len++] = value;
+
+		if (json_next_token(&next, stream) == false) {
+			free(tags);
+			free(value.name);
+			json_token_free(&next);
+			return false;
+		}
+
+		if (next.type == TOK_COMMA) {
+			continue;
+		} else if (next.type == TOK_RBRACE) {
+			break;
+		} else {
+			free(tags);
+			free(value.name);
+			json_token_free(&next);
+			return false;
+		}
+
+	}
+
+	data->compound.tags = xalloc(len * sizeof(tag_t));
+	data->compound.size = len;
+	memcpy(data->compound.tags, tags, len * sizeof(tag_t));
+	free(tags);
+
+	return true;
+}
+
+static bool json_read_value(tag_t *tag, const stream_t *stream, token_t *first) {
+	
+	token_t token;
+
+	if (first != NULL)
+		token = *first;
+	else if (json_next_token(&token, stream) == false)
+		return false;
+
+	tag->name = "";
+	tag->name_len = 0;
+
+	bool ok = true;
+
+	switch (token.type) {
+        case TOK_RBRACK:
+        case TOK_RBRACE:
+        case TOK_COLON:
+        case TOK_COMMA:
+        case TOK_NULL:
+			ok = false;
+			break;
+        case TOK_LBRACK:
+			tag->type = TAG_LIST;
+			ok = json_read_list(&tag->data, stream);
+			break;
+        case TOK_LBRACE:
+			tag->type = TAG_COMPOUND;
+			ok = json_read_compound(&tag->data, stream);
+			break;
+        case TOK_STRING:
+			tag->type = TAG_STRING;
+			tag->data.string.data = token.data.string.data;
+			tag->data.string.size = token.data.string.len;
+			break;
+        case TOK_NUMBER:
+			tag->type = TAG_LONG;
+			tag->data.l = token.data.number;
+			break;
+        case TOK_DOUBLE:
+			tag->type = TAG_DOUBLE;
+			tag->data.d = token.data.decimal;
+			break;
+        case TOK_BOOL:
+			tag->type = TAG_BYTE;
+			tag->data.b = token.data.b ? 1 : 0;
+			break;
+    }
+
+	return ok;
+}
+
+
+bool json_read(tag_t *tag, const stream_t *stream) {
+	return json_read_value(tag, stream, NULL);
+}
diff --git a/src/main.c b/src/main.c
index fec6d06..f4419eb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,24 +1,54 @@
-#include "tag.h"
 #include "lib.h"
+#include "tag.h"
+#include "flags.h"
+
 #include <stdio.h>
+#include <stdlib.h>
 
-int main (int argc, char** argv) {
+__attribute__((__noreturn__))
+void version() {
+	fprintf(stderr, "nbtvis v0.0.1\n");
+	fprintf(stderr, "Copyright (C) 2023 Freya Murphy\n");
+	exit(0);
+}
 
-	if (argc != 2) {
-		printf("usage: nbtvis file.nbt\n");
-		return 0;
-	}
+__attribute__((__noreturn__))
+void help() {
+	fprintf(stderr, "Usage: nbtvis [OPTION]... [INFILE] [OUTFILE]\n\n");
+	fprintf(stderr, "\t-j\tinput data is JSON\n");
+	fprintf(stderr, "\t-s\tinput data is SNBT\n");
+	fprintf(stderr, "\t-n\tinput data is NBT\n");
+	fprintf(stderr, "\t-J\toutput data is JSON\n");
+	fprintf(stderr, "\t-S\toutput data is SNBT\n");
+	fprintf(stderr, "\t-N\toutput data is NBT\n\n");
+	fprintf(stderr, "\t-h --help\tprint the help message\n");
+	fprintf(stderr, "\t-v --version\tprint the version\n");
+	fprintf(stderr, "\t--in=<file>\tset input file name\n");
+	fprintf(stderr, "\t--out=<file>\tset output file name\n");
+	exit(0);
+}
 
-	stream_t stream = stream_open(argv[1], "rb");
+int main(int argc, char **argv) {
+
+	flags_t flags;
+	parse_flags(&flags, argc, argv);
+
+	if (flags.help)
+		help();
+
+	if (flags.version)
+		version();
 
 	tag_t tag;
-	if (tag_read(&tag, &stream, true) == false)
-		error_and_die("failed to read tag\n");
+	if (tag_read(&tag, &flags.in, flags.fin) == false)
+		error_and_die("error: failed to read tag\n");
 
 	if (tag.type != TAG_COMPOUND)
-		error_and_die("root tag is not of type compound\n");
+		error_and_die("error: nbt tag not a valid compound tag\n");
 
-	tag_print(&tag);
+	if (tag_print(&tag, &flags.out, flags.fout) == false)
+		error_and_die("error: failed to write tag\n");
+	tag_free(&tag);
 
-	stream_close(&stream);
+	return 0;
 }
diff --git a/src/nbt/nbt.h b/src/nbt/nbt.h
new file mode 100644
index 0000000..13c0606
--- /dev/null
+++ b/src/nbt/nbt.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include "../tag.h"
+#include "../stream.h"
+
+bool nbt_read(tag_t *tag, const stream_t *stream);
+bool nbt_print(const tag_t *tag, const stream_t *stream);
diff --git a/src/nbt/print.c b/src/nbt/print.c
new file mode 100644
index 0000000..4eac31f
--- /dev/null
+++ b/src/nbt/print.c
@@ -0,0 +1,125 @@
+#include "nbt.h"
+
+static bool nbt_print_header(const tag_t *tag, const stream_t *stream, bool named) {
+	if (stream_write_i8(stream, tag->type) == false)
+		return false;
+	if (!named)
+		return true;
+	if (stream_write_u16(stream, tag->name_len) == false)
+		return false;
+	if (tag->name_len > 0)
+		if (stream_write(stream, tag->name, tag->name_len) == false)
+			return false;
+	return true;
+}
+
+static bool nbt_print_byte_array(const tagdata_t *data, const stream_t *stream) {
+	if (stream_write_i32(stream, data->b_arr.size) == false)
+		return false;
+	for (int32_t i = 0; i < data->b_arr.size; i++)
+		if (stream_write_i8(stream, data->b_arr.data[i]) == false)
+			return false;
+	return true;
+}
+
+static bool nbt_print_int_array(const tagdata_t *data, const stream_t *stream) {
+	if (stream_write_i32(stream, data->i_arr.size) == false)
+		return false;
+	for (int32_t i = 0; i < data->i_arr.size; i++)
+		if (stream_write_i32(stream, data->i_arr.data[i]) == false)
+			return false;
+	return true;
+}
+
+static bool nbt_print_long_array(const tagdata_t *data, const stream_t *stream) {
+	if (stream_write_i32(stream, data->l_arr.size) == false)
+		return false;
+	for (int32_t i = 0; i < data->l_arr.size; i++)
+		if (stream_write_i64(stream, data->l_arr.data[i]) == false)
+			return false;
+	return true;
+}
+
+static bool nbt_print_string(const tagdata_t *data, const stream_t *stream) {
+	if (stream_write_u16(stream, data->string.size) == false)
+		return false;
+	if (data->string.size < 1)
+		return true;
+	if (stream_write(stream, data->string.data, data->string.size) == false)
+		return false;
+	return true;
+}
+
+static bool nbt_print_data(const tag_t *tag, const stream_t *stream);
+
+static bool nbt_print_list(const tagdata_t *data, const stream_t *stream) {
+	if (stream_write_i8(stream, data->list.type) == false)
+		return false;
+	if (stream_write_i32(stream, data->list.size) == false)
+		return false;
+	for (int32_t i = 0; i < data->list.size; i++)
+		if (nbt_print_data(&data->list.tags[i], stream) == false)
+			return false;
+	return true;
+}
+
+static bool nbt_print_compound(const tagdata_t *data, const stream_t *stream) {
+	for (int32_t i = 0; i < data->compound.size; i++)
+		if (nbt_print(&data->compound.tags[i], stream) == false)
+			return false;
+	if (stream_write_i8(stream, TAG_END) == false)
+		return false;
+	return true;
+}
+
+static bool nbt_print_data(const tag_t *tag, const stream_t *stream) {
+	bool ok = true;
+
+	switch (tag->type) {
+        case TAG_END:
+			// tag end has no data
+			break;
+        case TAG_BYTE:
+			ok = stream_write_i8(stream, tag->data.b);
+			break;
+        case TAG_SHORT:
+			ok = stream_write_i16(stream, tag->data.s);
+			break;
+        case TAG_INT:
+        case TAG_FLOAT:
+			ok = stream_write_i32(stream, tag->data.i);
+			break;
+        case TAG_LONG:
+        case TAG_DOUBLE:
+			ok = stream_write_i64(stream, tag->data.l);
+			break;
+        case TAG_BYTE_ARRAY:
+			ok = nbt_print_byte_array(&tag->data, stream);
+			break;
+        case TAG_STRING:
+			ok = nbt_print_string(&tag->data, stream);
+			break;
+        case TAG_LIST:
+			ok = nbt_print_list(&tag->data, stream);
+			break;
+        case TAG_COMPOUND:
+			ok = nbt_print_compound(&tag->data, stream);
+			break;
+        case TAG_INT_ARRAY:
+			ok = nbt_print_int_array(&tag->data, stream);
+			break;
+        case TAG_LONG_ARRAY:
+			ok = nbt_print_long_array(&tag->data, stream);
+			break;
+        }
+
+	return ok;
+}
+
+bool nbt_print(const tag_t *tag, const stream_t *stream) {
+	if (nbt_print_header(tag, stream, true) == false)
+		return false;
+	if (nbt_print_data(tag, stream) == false)
+		return false;
+	return true;
+}
diff --git a/src/tag_read.c b/src/nbt/read.c
similarity index 74%
rename from src/tag_read.c
rename to src/nbt/read.c
index 5f43e7c..d5dd827 100644
--- a/src/tag_read.c
+++ b/src/nbt/read.c
@@ -1,10 +1,13 @@
-#include "tag.h"
-#include "lib.h"
+#include "nbt.h"
+#include "../lib.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-bool tag_read_header(tag_t *tag, stream_t *stream, bool named) {
+static bool nbt_read_data(tag_t *tag, const stream_t *stream);
+
+static bool nbt_read_header(tag_t *tag, const stream_t *stream, bool named) {
 	bool ok = true;
 
 	if (stream_read_i8(stream, &tag->type) == false)
@@ -34,7 +37,7 @@ bool tag_read_header(tag_t *tag, stream_t *stream, bool named) {
 }
 
 
-static bool tag_read_byte_array(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_byte_array(tagdata_t *data, const stream_t *stream) {
 	if (stream_read_i32(stream, &data->b_arr.size) == false)
 		return false;
 	if (data->b_arr.size == 0) {
@@ -48,7 +51,7 @@ static bool tag_read_byte_array(tagdata_t *data, stream_t *stream) {
 	return true;
 }
 
-static bool tag_read_int_array(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_int_array(tagdata_t *data, const stream_t *stream) {
 	if (stream_read_i32(stream, &data->i_arr.size) == false)
 		return false;
 	if (data->i_arr.size == 0) {
@@ -62,7 +65,7 @@ static bool tag_read_int_array(tagdata_t *data, stream_t *stream) {
 	return true;
 }
 
-static bool tag_read_long_array(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_long_array(tagdata_t *data, const stream_t *stream) {
 	if (stream_read_i32(stream, &data->l_arr.size) == false)
 		return false;
 	if (data->l_arr.size == 0) {
@@ -76,7 +79,7 @@ static bool tag_read_long_array(tagdata_t *data, stream_t *stream) {
 	return true;
 }
 
-static bool tag_read_string(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_string(tagdata_t *data, const stream_t *stream) {
 	if (stream_read_u16(stream, &data->string.size) == false)
 		return false;
 	if (data->string.size < 1) {
@@ -89,7 +92,7 @@ static bool tag_read_string(tagdata_t *data, stream_t *stream) {
 	return true;
 }
 
-static bool tag_read_list(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_list(tagdata_t *data, const stream_t *stream) {
 	if (stream_read_i8(stream, &data->list.type) == false)
 		return false;
 	if (stream_read_i32(stream, &data->list.size) == false)
@@ -107,14 +110,14 @@ static bool tag_read_list(tagdata_t *data, stream_t *stream) {
 		tag.type = data->list.type;
 		tag.name = "";
 		tag.name_len = 0;
-		if (tag_read_data(&tag, stream) == false)
+		if (nbt_read_data(&tag, stream) == false)
 			return false;
 		data->list.tags[i] = tag;
 	}
 	return true;
 }
 
-static bool tag_read_compound(tagdata_t *data, stream_t *stream) {
+static bool nbt_read_compound(tagdata_t *data, const stream_t *stream) {
 	int32_t size = 0;
 	int32_t capacity = 8;
 	tag_t *tags = xalloc(capacity * sizeof(tag_t));
@@ -123,14 +126,18 @@ static bool tag_read_compound(tagdata_t *data, stream_t *stream) {
 
 		tag_t tag;
 
-		if (tag_read_header(&tag, stream, true) == false)
+		if (nbt_read_header(&tag, stream, true) == false) {
+			free(tags);
 			return false;
+		}
 
 		if (tag.type == TAG_END)
 			break;
 
-		if (tag_read_data(&tag, stream) == false)
+		if (nbt_read_data(&tag, stream) == false) {
+			free(tags);
 			return false;
+		}
 		
 		if (size == capacity) {
 			capacity *= 2;
@@ -147,7 +154,8 @@ static bool tag_read_compound(tagdata_t *data, stream_t *stream) {
 
 	return true;
 }
-bool tag_read_data(tag_t *tag, stream_t *stream) {
+
+static bool nbt_read_data(tag_t *tag, const stream_t *stream) {
 	bool ok = true;
 
 	switch (tag->type) {
@@ -169,33 +177,33 @@ bool tag_read_data(tag_t *tag, stream_t *stream) {
 			ok = stream_read_i64(stream, &tag->data.l);
 			break;
         case TAG_BYTE_ARRAY:
-			ok = tag_read_byte_array(&tag->data, stream);
+			ok = nbt_read_byte_array(&tag->data, stream);
 			break;
         case TAG_STRING:
-			ok = tag_read_string(&tag->data, stream);
+			ok = nbt_read_string(&tag->data, stream);
 			break;
         case TAG_LIST:
-			ok = tag_read_list(&tag->data, stream);
+			ok = nbt_read_list(&tag->data, stream);
 			break;
         case TAG_COMPOUND:
-			ok = tag_read_compound(&tag->data, stream);
+			ok = nbt_read_compound(&tag->data, stream);
 			break;
         case TAG_INT_ARRAY:
-			ok = tag_read_int_array(&tag->data, stream);
+			ok = nbt_read_int_array(&tag->data, stream);
 			break;
         case TAG_LONG_ARRAY:
-			ok = tag_read_long_array(&tag->data, stream);
+			ok = nbt_read_long_array(&tag->data, stream);
 			break;
           break;
         };
     return ok;
 }
 
-bool tag_read(tag_t *tag, stream_t *stream, bool named) {
+bool nbt_read(tag_t *tag, const stream_t *stream) {
 	memset(tag, 0, sizeof(tag_t));
-	if (tag_read_header(tag, stream, named) == false)
+	if (nbt_read_header(tag, stream, true) == false)
 		return false;
-	if (tag_read_data(tag, stream) == false)
+	if (nbt_read_data(tag, stream) == false)
 		return false;
 	return true;
 }
diff --git a/src/stream.c b/src/stream.c
index 622fafa..6780d02 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -7,64 +7,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-stream_t stream_open(char *path, char* mode) {
-	stream_t stream;
-
-	if (strcmp("-", path) == 0) {
-		stream.__file = stdin;
-		stream.__alloc = false;
-	}
-
-	stream.__file = fopen(path, mode);
-	stream.__alloc = true;
-
-	if (stream.__file == NULL) {
-		perror_and_die("cannot read '%s'", path);
-	};
-
-	return stream;
-}
-
-void stream_close(stream_t *stream) {
-	if (stream->__alloc)
-		fclose(stream->__file);
-}
-
-bool stream_read(stream_t *stream, void *res, size_t amount) {
-	size_t read;
-	read = fread(res, 1, amount, stream->__file);
-
-	if (read == 0) {
-		if (feof(stream->__file) || errno == 0)
-			return false;
-		else
-		    perror_and_die("cannot read open stream");
-	}
-
-	return true;
-}
-
-bool stream_read_i8(stream_t *stream, int8_t *res) {
-	if (stream_read(stream, res, 1) == false)
-		return false;
-	return true;
-}
-
-bool stream_read_i16(stream_t *stream, int16_t *res) {
-	if (stream_read(stream, res, 2) == false)
-		return false;
-	*res = ntohs(*res);
-	return true;
-}
-
-bool stream_read_i32(stream_t *stream, int32_t *res) {
-	if (stream_read(stream, res, 4) == false)
-		return false;
-	*res = ntohl(*res);
-	return true;
-}
-
-static uint64_t ntohll(uint64_t ll) {
+static uint64_t longswap(uint64_t ll) {
 	if (htons(20) == 20)
 		return ll;
 
@@ -77,23 +20,125 @@ static uint64_t ntohll(uint64_t ll) {
 	return out.ll;
 }
 
-bool stream_read_i64(stream_t *stream, int64_t *res) {
-	if (stream_read(stream, res, 8) == false)
-		return false;
-	*res = ntohll(*res);
+
+stream_t stream_open(const char *path, const char* mode) {
+	stream_t stream;
+
+	if (strcmp("-", path) == 0) {
+		if (*mode == 'r')
+			stream.__file = stdin;
+		else
+			stream.__file = stdout;
+		stream.__alloc = false;
+		return stream;
+	}
+
+	stream.__file = fopen(path, mode);
+	stream.__alloc = true;
+
+	if (stream.__file == NULL) {
+		perror_and_die("cannot open '%s'", path);
+	};
+
+	return stream;
+}
+
+void stream_close(stream_t *stream) {
+	if (stream->__alloc)
+		fclose(stream->__file);
+}
+
+bool stream_read(const stream_t *stream, void *res, size_t amount) {
+	size_t read;
+	read = fread(res, 1, amount, stream->__file);
+
+	if (read == 0) {
+		if (feof(stream->__file) || errno == 0)
+			return false;
+		else
+		    perror_and_die("cannot read from stream");
+	}
+
 	return true;
 }
 
-bool stream_read_u16(stream_t *stream, uint16_t *res) {
+bool stream_read_i8(const stream_t *stream, int8_t *res) {
+	if (stream_read(stream, res, 1) == false)
+		return false;
+	return true;
+}
+
+bool stream_read_i16(const stream_t *stream, int16_t *res) {
 	if (stream_read(stream, res, 2) == false)
 		return false;
 	*res = ntohs(*res);
 	return true;
 }
 
-bool stream_read_u32(stream_t *stream, uint32_t *res) {
+bool stream_read_i32(const stream_t *stream, int32_t *res) {
 	if (stream_read(stream, res, 4) == false)
 		return false;
 	*res = ntohl(*res);
 	return true;
 }
+
+bool stream_read_i64(const stream_t *stream, int64_t *res) {
+	if (stream_read(stream, res, 8) == false)
+		return false;
+	*res = longswap(*res);
+	return true;
+}
+
+bool stream_read_u16(const stream_t *stream, uint16_t *res) {
+	if (stream_read(stream, res, 2) == false)
+		return false;
+	*res = ntohs(*res);
+	return true;
+}
+
+bool stream_write(const stream_t *stream, const void *buf, size_t amount) {
+	size_t wrote;
+	wrote = fwrite(buf, 1, amount, stream->__file);
+
+	if (wrote == 0)
+		perror_and_die("cannot write to stream");
+
+	if (wrote < amount)
+		return false;
+
+	return true;
+}
+
+bool stream_write_i8(const stream_t *stream, int8_t b) {
+	if (stream_write(stream, &b, 1) == false)
+		return false;
+	return true;
+}
+
+bool stream_write_i16(const stream_t *stream, int16_t s) {
+	s = htons(s);
+	if (stream_write(stream, &s, 2) == false)
+		return false;
+	return true;
+}
+
+bool stream_write_i32(const stream_t *stream, int32_t i) {
+	i = htonl(i);
+	if (stream_write(stream, &i, 4) == false)
+		return false;
+	return true;
+}
+
+bool stream_write_i64(const stream_t *stream, int64_t l) {
+	l = longswap(l);
+	if (stream_write(stream, &l, 8) == false)
+		return false;
+	return true;
+}
+
+bool stream_write_u16(const stream_t *stream, uint16_t s) {
+	s = htons(s);
+	if (stream_write(stream, &s, 2) == false)
+		return false;
+	return true;
+}
diff --git a/src/stream.h b/src/stream.h
index e9fd920..d9a05ce 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -9,14 +9,19 @@ typedef struct {
 	bool __alloc;
 } stream_t;
 
-stream_t stream_open(char *path, char* mode);
+stream_t stream_open(const char *path, const char* mode);
 void stream_close(stream_t *stream);
-bool stream_read(stream_t *stream, void *res, size_t amount);
 
-bool stream_read_i8(stream_t *stream, int8_t *res);
-bool stream_read_i16(stream_t *stream, int16_t *res);
-bool stream_read_i32(stream_t *stream, int32_t *res);
-bool stream_read_i64(stream_t *stream, int64_t *res);
+bool stream_read(const stream_t *stream, void *res, size_t amount);
+bool stream_read_i8(const stream_t *stream, int8_t *res);
+bool stream_read_i16(const stream_t *stream, int16_t *res);
+bool stream_read_i32(const stream_t *stream, int32_t *res);
+bool stream_read_i64(const stream_t *stream, int64_t *res);
+bool stream_read_u16(const stream_t *stream, uint16_t *res);
 
-bool stream_read_u16(stream_t *stream, uint16_t *res);
-bool stream_read_u32(stream_t *stream, uint32_t *res);
+bool stream_write(const stream_t *stream, const void *buf, size_t amount);
+bool stream_write_i8(const stream_t *stream, int8_t b);
+bool stream_write_i16(const stream_t *stream, int16_t s);
+bool stream_write_i32(const stream_t *stream, int32_t i);
+bool stream_write_i64(const stream_t *stream, int64_t l);
+bool stream_write_u16(const stream_t *stream, uint16_t s);
diff --git a/src/tag.c b/src/tag.c
new file mode 100644
index 0000000..25d9d32
--- /dev/null
+++ b/src/tag.c
@@ -0,0 +1,66 @@
+#include "tag.h"
+#include "nbt/nbt.h"
+#include "json/json.h"
+
+#include <stdlib.h>
+
+void tag_free(tag_t *tag) {
+	if (tag->name_len > 0 && tag->name != NULL)
+		free(tag->name);
+	switch(tag->type) {
+        case TAG_END:
+        case TAG_BYTE:
+        case TAG_SHORT:
+        case TAG_INT:
+        case TAG_LONG:
+        case TAG_FLOAT:
+        case TAG_DOUBLE:
+			break;
+        case TAG_BYTE_ARRAY:
+			free(tag->data.b_arr.data);
+			break;
+        case TAG_STRING:
+			free(tag->data.string.data);
+			break;
+        case TAG_LIST:
+			for (int32_t i = 0; i < tag->data.list.size; i++)
+				tag_free(&tag->data.list.tags[i]);
+			free(tag->data.list.tags);
+			break;
+        case TAG_COMPOUND:
+			for (int32_t i = 0; i < tag->data.compound.size; i++)
+				tag_free(&tag->data.compound.tags[i]);
+			free(tag->data.compound.tags);
+			break;
+        case TAG_INT_ARRAY:
+			free(tag->data.i_arr.data);
+			break;
+        case TAG_LONG_ARRAY:
+			free(tag->data.l_arr.data);
+			break;
+    }
+}
+
+bool tag_read(tag_t *tag, const stream_t *stream, format_t format) {
+	switch (format) {
+        case JSON:
+			return json_read(tag, stream);
+        case NBT:
+			return nbt_read(tag, stream);
+        case SNBT:
+		default:
+			return false;
+    }
+}
+
+bool tag_print(tag_t *tag, const stream_t *stream, format_t format) {
+	switch (format) {
+		case JSON:
+			return json_print(tag, stream);
+		case NBT:
+			return nbt_print(tag, stream);
+		case SNBT:
+		default:
+			return false;
+	}
+}
diff --git a/src/tag.h b/src/tag.h
index 93eff64..d0033a5 100644
--- a/src/tag.h
+++ b/src/tag.h
@@ -67,7 +67,13 @@ typedef struct tag_t {
 	char *name;
 } tag_t;
 
-bool tag_read_header(tag_t *tag, stream_t *stream, bool named);
-bool tag_read_data(tag_t *tag, stream_t *stream);
-bool tag_read(tag_t *tag, stream_t *stream, bool named);
-void tag_print(const tag_t *tag);
+typedef enum {
+	JSON,
+	NBT,
+	SNBT
+} format_t;
+
+void tag_free(tag_t *tag);
+bool tag_read(tag_t *tag, const stream_t *stream, format_t format);
+bool tag_print(tag_t *tag, const stream_t *stream, format_t format);
+
diff --git a/src/tag_print.c b/src/tag_print.c
deleted file mode 100644
index b6a8e1a..0000000
--- a/src/tag_print.c
+++ /dev/null
@@ -1,101 +0,0 @@
-#include "tag.h"
-#include <stdarg.h>
-#include <stdio.h>
-
-__attribute__((format(printf, 2, 3)))
-static void printi(int depth, const char *format, ...) {
-	for (int i = 0; i < depth; i++)
-		printf("\t");
-	va_list list;
-	va_start(list, format);
-	vprintf(format, list);
-}
-
-static void tag_print_impl(const tag_t *tag, int depth);
-
-static void tag_print_data(const tag_t *tag, int depth) {
-	switch (tag->type) {
-        case TAG_BYTE:
-			printf("%hhd", tag->data.b);
-			break;
-        case TAG_SHORT:
-			printf("%hd", tag->data.s);
-			break;
-        case TAG_INT:
-			printf("%d", tag->data.i);
-			break;
-        case TAG_LONG:
-			printf("%ld", tag->data.l);
-			break;
-        case TAG_FLOAT:
-			printf("%f", tag->data.f);
-			break;
-        case TAG_DOUBLE:
-			printf("%lf", tag->data.d);
-			break;
-        case TAG_BYTE_ARRAY:
-			printf("[");
-			for (int32_t i = 0; i < tag->data.b_arr.size; i++) {
-				if (i != 0) printf(",");
-				printf("%hhd", tag->data.b_arr.data[i]);
-			}
-			printf("]");
-			break;
-        case TAG_STRING:
-			if (tag->data.string.size > 1)
-				printf("\"%.*s\"", tag->data.string.size, tag->data.string.data);
-			else
-				printf("\"\"");
-			break;
-        case TAG_LIST:
-			printf("[\n");
-			for (int32_t i = 0; i < tag->data.list.size; i++) {
-				if (i != 0) printf(",\n");
-				tag_print_impl(&tag->data.list.tags[i], depth + 1);
-			}
-			printf("\n");
-			printi(depth, "]");
-			break;
-        case TAG_COMPOUND:
-			printf("{\n");
-			for (int32_t i = 0; i < tag->data.compound.size; i++) {
-				if (i != 0) printf(",\n");
-				tag_print_impl(&tag->data.compound.tags[i], depth + 1);
-			}
-			printf("\n");
-			printi(depth, "}");
-			break;
-        case TAG_INT_ARRAY:
-			printi(depth, "[");
-			for (int32_t i = 0; i < tag->data.i_arr.size; i++) {
-				if (i != 0) printf(",");
-				printf("%d", tag->data.i_arr.data[i]);
-			}
-			printf("]");
-			break;
-        case TAG_LONG_ARRAY:
-			printf("[");
-			for (int32_t i = 0; i < tag->data.l_arr.size; i++) {
-				if (i != 0) printf(",");
-				printf("%ld", tag->data.l_arr.data[i]);
-			}
-			printf("]");
-			break;
-        case TAG_END:
-          break;
-        }
-}
-
-static void tag_print_impl(const tag_t *tag, int depth) {
-	if (tag->name_len > 0) {
-		printi(depth, "\"%.*s\":\t", tag->name_len, tag->name);
-	} else {
-		for (int i = 0; i < depth; i++) printf("\t");
-	}
-	tag_print_data(tag, depth);
-}
-
-void tag_print(const tag_t *tag) {
-	tag_print_impl(tag, 0);
-	printf("\n");
-}