diff --git a/crowdin.yml b/crowdin.yml
index 160b9184d..4c050b1a9 100644
--- a/crowdin.yml
+++ b/crowdin.yml
@@ -5,3 +5,6 @@ files:
   - source: /src/docs/ja-JP/*.md
     translation: /src/docs/%locale%/%original_file_name%
     update_option: update_as_unapproved
+  - source: /src/api-docs/ja-JP/**/*.yml
+    translation: /src/api-docs/%locale%/**/%original_file_name%
+    update_option: update_as_unapproved
diff --git a/gulpfile.ts b/gulpfile.ts
index bdc20089c..f123ccd74 100644
--- a/gulpfile.ts
+++ b/gulpfile.ts
@@ -60,7 +60,14 @@ gulp.task('build:client:style', () => {
 		.pipe(gulp.dest('./built/server/web/'));
 });
 
-gulp.task('build:copy', gulp.parallel('build:copy:locales', 'build:copy:views', 'build:client:script', 'build:client:style', 'build:copy:fonts', () =>
+gulp.task('copy:api-docs', () =>
+		gulp.src([
+			'./src/api-docs/**/*',
+		])
+		.pipe(gulp.dest('./built/api-docs/'))
+);
+
+gulp.task('build:copy', gulp.parallel('build:copy:locales', 'copy:api-docs', 'build:copy:views', 'build:client:script', 'build:client:style', 'build:copy:fonts', () =>
 	gulp.src([
 		'./src/emojilist.json',
 		'./src/server/web/views/**/*',
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 992f6c842..ed53dfc4f 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1590,3 +1590,6 @@ _deck:
     list: "リスト"
     mentions: "あなた宛て"
     direct: "ダイレクト"
+
+_apiDoc:
+  accessTokenRequired: "アクセストークンが必要です"
diff --git a/src/api-docs/ja-JP/meta.yml b/src/api-docs/ja-JP/meta.yml
new file mode 100644
index 000000000..ce680b820
--- /dev/null
+++ b/src/api-docs/ja-JP/meta.yml
@@ -0,0 +1,10 @@
+description: "インスタンスのメタ情報を取得します。"
+
+params:
+  detail: "追加情報を含めるか否か"
+
+res:
+  version: "Misskeyのバージョン"
+  announcements: "お知らせ"
+  announcements.title: "タイトル"
+  announcements.text: "本文"
diff --git a/src/api-docs/ja-JP/notes/create.yml b/src/api-docs/ja-JP/notes/create.yml
new file mode 100644
index 000000000..add6ff5e3
--- /dev/null
+++ b/src/api-docs/ja-JP/notes/create.yml
@@ -0,0 +1,7 @@
+description: "ノートを作成します。"
+
+params:
+  visibility: "ノートの公開範囲"
+
+res:
+  createdNote: "作成したノート"
diff --git a/src/client/pages/api-console.vue b/src/client/pages/api-console.vue
index dd5cacaee..1d2012b5d 100644
--- a/src/client/pages/api-console.vue
+++ b/src/client/pages/api-console.vue
@@ -58,7 +58,7 @@ export default defineComponent({
 
 	created() {
 		os.api('endpoints').then(endpoints => {
-			this.endpoints = endpoints;
+			this.endpoints = endpoints.map(x => x.name);
 		});
 	},
 
diff --git a/src/client/pages/api-docs/endpoint.vue b/src/client/pages/api-docs/endpoint.vue
new file mode 100644
index 000000000..4eabedcb9
--- /dev/null
+++ b/src/client/pages/api-docs/endpoint.vue
@@ -0,0 +1,201 @@
+<template>
+<div class="rfbvytqb" v-size="{ max: [500] }">
+	<div class="title">{{ endpoint }}</div>
+	<div class="body" v-if="ep">
+		<div class="url _code">POST {{ apiUrl }}/{{ endpoint }}</div>
+		<section class="description">{{ ep.spec.description }}</section>
+		<MkA to="/api-console" :behavior="'window'">API console</MkA>
+		<section class="params">
+			<h2>Params</h2>
+			<XValue :value="ep.spec.requestBody.content['application/json'].schema" :schemas="ep.schemas"/>
+		</section>
+		<section class="res">
+			<h2>Response</h2>
+			<section v-for="status in Object.keys(ep.spec.responses)" :key="status">
+				<h3>{{ status }}</h3>
+				<XValue v-if="ep.spec.responses[status].content" :value="ep.spec.responses[status].content['application/json'].schema" :schemas="ep.schemas"/>
+			</section>
+		</section>
+		<section class="raw">
+			<h2>Raw spec info</h2>
+			<details>
+				<summary>Show</summary>
+				<pre class="_code">{{ JSON.stringify(ep.spec, null, '\t') }}</pre>
+			</details>
+		</section>
+	</div>
+	<div class="footer">
+		<MkLink :url="`https://github.com/syuilo/misskey/blob/master/src/docs/${lang}/${doc}.md`" class="at">{{ $ts.docSource }}</MkLink>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { computed, defineComponent } from 'vue';
+import { faQuestionCircle } from '@fortawesome/free-solid-svg-icons'
+import { url, lang, apiUrl } from '@/config';
+import MkLink from '@/components/link.vue';
+import XValue from './value.vue';
+import * as os from '@/os';
+
+export default defineComponent({
+	components: {
+		MkLink,
+		XValue,
+	},
+
+	props: {
+		endpoint: {
+			type: String,
+			required: true
+		}
+	},
+
+	data() {
+		return {
+			INFO: computed(() => this.ep ? {
+				title: this.endpoint,
+				icon: faQuestionCircle,
+			} : null),
+			ep: null,
+			lang,
+			apiUrl,
+		}
+	},
+
+	watch: {
+		endpoint: {
+			handler() {
+				this.fetchDoc();
+			},
+			immediate: true,
+		}
+	},
+
+	methods: {
+		fetchDoc() {
+			os.api('endpoint', {
+				endpoint: this.endpoint,
+				lang: lang
+			}).then(ep => {
+				this.ep = ep;
+			});
+		},
+	}
+});
+</script>
+
+<style lang="scss" scoped>
+.rfbvytqb {
+	padding: 32px;
+
+	&.max-width_500px {
+		padding: 16px;
+	}
+
+	> .title {
+		font-size: 1.5em;
+		font-weight: bold;
+		padding: 0 0 0.75em 0;
+		margin: 0 0 1em 0;
+		border-bottom: solid 2px var(--divider);
+	}
+
+	> .body {
+		> *:first-child {
+			margin-top: 0;
+		}
+
+		> *:last-child {
+			margin-bottom: 0;
+		}
+
+		> .url {
+			padding: 6px 12px;
+			border-radius: 4px;
+			margin-bottom: 16px;
+		}
+
+		> .raw {
+			> details {
+				> pre {
+					overflow: auto;
+				}
+			}
+		}
+
+		::v-deep(a) {
+			color: var(--link);
+		}
+
+		::v-deep(blockquote) {
+			display: block;
+			margin: 8px;
+			padding: 6px 0 6px 12px;
+			color: var(--fg);
+			border-left: solid 3px var(--fg);
+			opacity: 0.7;
+
+			p {
+				margin: 0;
+			}
+		}
+
+		::v-deep(h2) {
+			font-size: 1.25em;
+			padding: 0 0 0.5em 0;
+			margin: 1.5em 0 1em 0;
+			border-bottom: solid 1px var(--divider);
+		}
+
+		::v-deep(table) {
+			width: 100%;
+			max-width: 100%;
+			overflow: auto;
+		}
+
+		::v-deep(kbd.group) {
+			display: inline-block;
+			padding: 2px;
+			border: 1px solid var(--divider);
+			border-radius: 4px;
+			box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
+		}
+
+		::v-deep(kbd.key) {
+			display: inline-block;
+			padding: 6px 8px;
+			border: solid 1px var(--divider);
+			border-radius: 4px;
+			box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
+		}
+
+		::v-deep(code) {
+			display: inline-block;
+			font-family: Fira code, Fira Mono, Consolas, Menlo, Courier, monospace;
+			tab-size: 2;
+			background: #272822;
+			color: #f8f8f2;
+			border-radius: 6px;
+			padding: 4px 6px;
+		}
+
+		::v-deep(pre) {
+			background: #272822;
+			color: #f8f8f2;
+			border-radius: 6px;
+			padding: 12px 16px;
+
+			> code {
+				padding: 0;
+			}
+		}
+	}
+
+	> .footer {
+		padding: 1.5em 0 0 0;
+		margin: 1.5em 0 0 0;
+		border-top: solid 2px var(--divider);
+	}
+}
+</style>
diff --git a/src/client/pages/api-docs/index.vue b/src/client/pages/api-docs/index.vue
new file mode 100644
index 000000000..f47c8fc97
--- /dev/null
+++ b/src/client/pages/api-docs/index.vue
@@ -0,0 +1,67 @@
+<template>
+<div class="smzyuecx">
+	<div class="tags">
+		<button v-for="tag in tags" :key="tag" class="tag _button">
+			{{ tag }}
+		</button>
+	</div>
+
+	<ul>
+		<li v-for="endpoint in endpoints" :key="endpoint.name">
+			<MkA :to="`/api-docs/endpoints/${endpoint.name}`">{{ endpoint.name }}</MkA>
+		</li>
+	</ul>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import { faQuestionCircle } from '@fortawesome/free-solid-svg-icons'
+import { url, lang } from '@/config';
+import * as os from '@/os';
+
+export default defineComponent({
+	data() {
+		return {
+			INFO: {
+				title: 'Misskey API',
+				icon: faQuestionCircle
+			},
+			endpoints: [],
+			tags: [],
+			faQuestionCircle
+		}
+	},
+
+	created() {
+		os.api('endpoints').then(endpoints => {
+			this.endpoints = endpoints;
+
+			const tags = new Set();
+			for (const endpoint of this.endpoints) {
+				if (endpoint.tags) {
+					for (const tag of endpoint.tags) {
+						tags.add(tag);
+					}
+				}
+			}
+
+			this.tags = Array.from(tags);
+		});
+	},
+});
+</script>
+
+<style lang="scss" scoped>
+.smzyuecx {
+	> .tags {
+		> .tag {
+			display: inline-block;
+			border: solid 1px var(--divider);
+			border-radius: 6px;
+			padding: 12px 16px;
+			margin: 8px;
+		}
+	} 
+}
+</style>
diff --git a/src/client/pages/api-docs/value.array.vue b/src/client/pages/api-docs/value.array.vue
new file mode 100644
index 000000000..9ffd0e88b
--- /dev/null
+++ b/src/client/pages/api-docs/value.array.vue
@@ -0,0 +1,46 @@
+<template>
+<div class="">
+	Array of
+	<div class="">
+		<XValue class="" :value="array" :schemas="schemas"/>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import XValue from './value.vue';
+import MkContainer from '@/components/ui/container.vue';
+
+export default defineComponent({
+	name: 'XArray',
+
+	components: {
+		MkContainer,
+		XValue,
+	},
+
+	props: {
+		array: {
+			type: Object,
+			required: true
+		},
+		schemas: {
+			type: Object,
+			required: true
+		},
+	},
+
+	data() {
+		return {
+		};
+	},
+
+	created() {
+	},
+});
+</script>
+
+<style lang="scss" scoped>
+
+</style>
diff --git a/src/client/pages/api-docs/value.object.vue b/src/client/pages/api-docs/value.object.vue
new file mode 100644
index 000000000..8f1c8824f
--- /dev/null
+++ b/src/client/pages/api-docs/value.object.vue
@@ -0,0 +1,78 @@
+<template>
+<div class="jhpkzgfz">
+	<div class="empty" v-if="kvs.length === 0">
+		No fields
+	</div>
+	<div class="kvs" v-else>
+		<div class="kv" v-for="kv in kvs" :key="kv[0]">
+			<div class="k _monospace">{{ kv[0] }}</div>
+			<XValue class="v" :value="kv[1]" :schemas="schemas"/>
+		</div>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import XValue from './value.vue';
+import MkContainer from '@/components/ui/container.vue';
+
+export default defineComponent({
+	name: 'XObject',
+
+	components: {
+		MkContainer,
+		XValue,
+	},
+
+	props: {
+		obj: {
+			type: Object,
+			required: true
+		},
+		schemas: {
+			type: Object,
+			required: true
+		},
+	},
+
+	data() {
+		return {
+			kvs: Object.entries(this.obj)
+		};
+	},
+
+	created() {
+	},
+});
+</script>
+
+<style lang="scss" scoped>
+.jhpkzgfz {
+	border: solid 1px var(--divider);
+	border-radius: 4px;
+	padding: 16px;
+
+	> .kvs {
+		> .kv {
+			display: flex;
+
+			&:not(:first-child) {
+				margin-top: 16px;
+				padding-top: 16px;
+				border-top: solid 1px var(--divider);
+			}
+
+			> .k {
+				font-weight: bold;
+				margin-right: 1em;
+				min-width: 8em;
+			}
+
+			> .v {
+				flex: 1;
+			}
+		}
+	}
+}
+</style>
diff --git a/src/client/pages/api-docs/value.vue b/src/client/pages/api-docs/value.vue
new file mode 100644
index 000000000..d7f7c087a
--- /dev/null
+++ b/src/client/pages/api-docs/value.vue
@@ -0,0 +1,96 @@
+<template>
+<div class="ezkosiua">
+	<div class="header _monospace">
+		<span v-if="value.$ref" class="ref">
+			<button class="_textButton" @click="resolveRef = true">
+				{{ value.$ref.replace('#/components/schemas/', '') }}
+			</button>
+		</span>
+		<span class="type">{{ type }}</span>
+	</div>
+	<div class="body">
+		<div class="description">{{ value.description }}</div>
+
+		<div v-if="value.$ref" class="ref">
+			<div v-if="resolveRef">
+				<XValue :value="schemas[value.$ref.replace('#/components/schemas/', '')]" :schemas="schemas"/>
+			</div>
+		</div>
+		<div v-else-if="value.type === 'object'">
+			<XObject :obj="value.properties || {}" :schemas="schemas"/>
+		</div>
+		<div v-else-if="value.type === 'array'">
+			<XArray :array="value.items" :schemas="schemas"/>
+		</div>
+		<div v-else-if="value.type === 'string'">
+		</div>
+		<div v-else>
+			unknown
+		</div>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import Button from '@/components/ui/button.vue';
+import { defineComponent, defineAsyncComponent } from 'vue';
+import MkContainer from '@/components/ui/container.vue';
+
+function getType(value) {
+	let t = value.type === 'array' ? `${getType(value.items)}[]` : value.type;
+	if (value.nullable) t = `(${t} | null)`;
+	return t;
+}
+
+export default defineComponent({
+	name: 'XValue',
+
+	components: {
+		MkContainer,
+		XObject: defineAsyncComponent(() => import('./value.object.vue')),
+		XArray: defineAsyncComponent(() => import('./value.array.vue')),
+		Button,
+	},
+
+	props: {
+		value: {
+			type: Object,
+			required: true
+		},
+		schemas: {
+			type: Object,
+			required: true
+		},
+	},
+
+	data() {
+		return {
+			resolveRef: false,
+			type: getType(this.value)
+		};
+	},
+
+	created() {
+	},
+});
+</script>
+
+<style lang="scss" scoped>
+.ezkosiua {
+	> .header {
+		> .ref {
+			margin-right: 8px;
+		}
+
+		> .type {
+			border: solid 1px var(--divider);
+			border-radius: 4px;
+			padding: 3px 6px;
+		}
+	}
+
+	> .body {
+		margin-top: 8px;
+	}
+}
+</style>
diff --git a/src/client/pages/docs.vue b/src/client/pages/docs.vue
index 59d23efcb..05d1f407b 100644
--- a/src/client/pages/docs.vue
+++ b/src/client/pages/docs.vue
@@ -7,6 +7,11 @@
 					<MkA :to="`/docs/${doc.path}`">{{ doc.title }}</MkA>
 				</li>
 			</ul>
+			<ul>
+				<li>
+					<MkA :to="`/api-docs`">API reference</MkA>
+				</li>
+			</ul>
 		</div>
 	</main>
 </div>
diff --git a/src/client/router.ts b/src/client/router.ts
index 5f2a65745..db0870f3e 100644
--- a/src/client/router.ts
+++ b/src/client/router.ts
@@ -31,6 +31,9 @@ export const router = createRouter({
 		{ path: '/theme-editor', component: page('theme-editor') },
 		{ path: '/advanced-theme-editor', component: page('advanced-theme-editor') },
 		{ path: '/docs/:doc', component: page('doc'), props: route => ({ doc: route.params.doc }) },
+		{ path: '/api-docs', component: page('api-docs/index') },
+		{ path: '/api-docs/endpoints/:endpoint(.*)', component: page('api-docs/endpoint'), props: route => ({ endpoint: route.params.endpoint }) },
+		{ path: '/theme-editor', component: page('theme-editor') },
 		{ path: '/explore', component: page('explore') },
 		{ path: '/explore/tags/:tag', props: true, component: page('explore') },
 		{ path: '/search', component: page('search') },
diff --git a/src/client/style.scss b/src/client/style.scss
index f4da7cafe..f81a2b4e1 100644
--- a/src/client/style.scss
+++ b/src/client/style.scss
@@ -474,6 +474,7 @@ hr {
 	color: #ccc;
 	font-size: 14px;
 	line-height: 1.5;
+	tab-size: 2;
 	padding: 5px;
 }
 
diff --git a/src/server/api/endpoints/endpoint.ts b/src/server/api/endpoints/endpoint.ts
index 1a04d8bee..faa76b687 100644
--- a/src/server/api/endpoints/endpoint.ts
+++ b/src/server/api/endpoints/endpoint.ts
@@ -1,6 +1,8 @@
 import $ from 'cafy';
 import define from '../define';
 import endpoints from '../endpoints';
+import { genOpenapiSpecForEndpoint } from '../openapi/gen-spec';
+import { schemas } from '../openapi/schemas';
 
 export const meta = {
 	requireCredential: false as const,
@@ -9,18 +11,28 @@ export const meta = {
 
 	params: {
 		endpoint: {
+			// TODO: セキュリティリスクになりうるためバリデーションしたい
 			validator: $.str,
+		},
+		lang: {
+			// TODO: セキュリティリスクになりうるためバリデーションしたい
+			validator: $.str,
+			default: 'ja-JP'
 		}
 	},
 };
 
 export default define(meta, async (ps) => {
+	if (ps.endpoint.includes('.')) return null;
+	if (ps.lang.includes('.')) return null;
 	const ep = endpoints.find(x => x.name === ps.endpoint);
 	if (ep == null) return null;
 	return {
 		params: Object.entries(ep.meta.params || {}).map(([k, v]) => ({
 			name: k,
 			type: v.validator.name === 'ID' ? 'String' : v.validator.name
-		}))
+		})),
+		schemas: schemas,
+		spec: genOpenapiSpecForEndpoint(ep, ps.lang)
 	};
 });
diff --git a/src/server/api/endpoints/endpoints.ts b/src/server/api/endpoints/endpoints.ts
index 3ab14389a..e42d73935 100644
--- a/src/server/api/endpoints/endpoints.ts
+++ b/src/server/api/endpoints/endpoints.ts
@@ -11,5 +11,8 @@ export const meta = {
 };
 
 export default define(meta, async () => {
-	return endpoints.map(x => x.name);
+	return endpoints.map(x => ({
+		name: x.name,
+		tags: x.meta.tags,
+	}));
 });
diff --git a/src/server/api/openapi/gen-spec.ts b/src/server/api/openapi/gen-spec.ts
index 78e481037..87cddedac 100644
--- a/src/server/api/openapi/gen-spec.ts
+++ b/src/server/api/openapi/gen-spec.ts
@@ -1,44 +1,22 @@
-import endpoints from '../endpoints';
+import endpoints, { IEndpoint } from '../endpoints';
 import { Context } from 'cafy';
+import * as yaml from 'js-yaml';
+import * as fs from 'fs';
 import config from '../../../config';
 import { errors as basicErrors } from './errors';
 import { schemas, convertSchemaToOpenApiSchema } from './schemas';
 import { getDescription } from './description';
 
-export function genOpenapiSpec(lang = 'ja-JP') {
-	const spec = {
-		openapi: '3.0.0',
+export function genOpenapiSpecForEndpoint(endpoint: IEndpoint, lang = 'ja-JP') {
+	let locale;
 
-		info: {
-			version: 'v1',
-			title: 'Misskey API',
-			description: getDescription(lang),
-			'x-logo': { url: '/assets/api-doc.png' }
-		},
-
-		externalDocs: {
-			description: 'Repository',
-			url: 'https://github.com/syuilo/misskey'
-		},
-
-		servers: [{
-			url: config.apiUrl
-		}],
-
-		paths: {} as any,
-
-		components: {
-			schemas: schemas,
-
-			securitySchemes: {
-				ApiKeyAuth: {
-					type: 'apiKey',
-					in: 'body',
-					name: 'i'
-				}
-			}
-		}
-	};
+	try {
+		locale = yaml.safeLoad(fs.readFileSync(__dirname + `/../../../api-docs/${lang}/` + endpoint.name + '.yml', 'utf-8'));
+	} catch (e) {
+		locale = {
+			params: {}
+		};
+	}
 
 	function genProps(props: { [key: string]: Context; }) {
 		const properties = {} as any;
@@ -79,157 +57,195 @@ export function genOpenapiSpec(lang = 'ja-JP') {
 		};
 	}
 
-	for (const endpoint of endpoints.filter(ep => !ep.meta.secure)) {
-		const porops = {} as any;
-		const errors = {} as any;
+	const porops = {} as any;
+	const errors = {} as any;
 
-		if (endpoint.meta.errors) {
-			for (const e of Object.values(endpoint.meta.errors)) {
-				errors[e.code] = {
-					value: {
-						error: e
+	if (endpoint.meta.errors) {
+		for (const e of Object.values(endpoint.meta.errors)) {
+			errors[e.code] = {
+				value: {
+					error: e
+				}
+			};
+		}
+	}
+
+	if (endpoint.meta.params) {
+		for (const [k, v] of Object.entries(endpoint.meta.params)) {
+			if (v.validator.data == null) v.validator.data = {};
+			v.validator.data.desc = locale.params[k];
+			if (v.deprecated) v.validator.data.deprecated = v.deprecated;
+			if (v.default) v.validator.data.default = v.default;
+			porops[k] = v.validator;
+		}
+	}
+
+	const required = endpoint.meta.params ? Object.entries(endpoint.meta.params).filter(([k, v]) => !v.validator.isOptional).map(([k, v]) => k) : [];
+
+	const resSchema = endpoint.meta.res ? convertSchemaToOpenApiSchema(endpoint.meta.res) : {};
+
+	let desc = (locale.description || 'No description provided.') + '\n\n';
+	desc += `**Credential required**: *${endpoint.meta.requireCredential ? 'Yes' : 'No'}*`;
+	if (endpoint.meta.kind) {
+		const kind = endpoint.meta.kind;
+		desc += ` / **Permission**: *${kind}*`;
+	}
+
+	const info = {
+		operationId: endpoint.name,
+		summary: endpoint.name,
+		description: desc,
+		externalDocs: {
+			description: 'Source code',
+			url: `https://github.com/syuilo/misskey/blob/develop/src/server/api/endpoints/${endpoint.name}.ts`
+		},
+		...(endpoint.meta.tags ? {
+			tags: [endpoint.meta.tags[0]]
+		} : {}),
+		...(endpoint.meta.requireCredential ? {
+			security: [{
+				ApiKeyAuth: []
+			}]
+		} : {}),
+		requestBody: {
+			required: true,
+			content: {
+				'application/json': {
+					schema: {
+						type: 'object',
+						...(required.length > 0 ? { required } : {}),
+						properties: endpoint.meta.params ? genProps(porops) : {}
 					}
-				};
+				}
 			}
-		}
-
-		if (endpoint.meta.params) {
-			for (const [k, v] of Object.entries(endpoint.meta.params)) {
-				if (v.validator.data == null) v.validator.data = {};
-				if (v.desc) v.validator.data.desc = v.desc[lang];
-				if (v.deprecated) v.validator.data.deprecated = v.deprecated;
-				if (v.default) v.validator.data.default = v.default;
-				porops[k] = v.validator;
-			}
-		}
-
-		const required = endpoint.meta.params ? Object.entries(endpoint.meta.params).filter(([k, v]) => !v.validator.isOptional).map(([k, v]) => k) : [];
-
-		const resSchema = endpoint.meta.res ? convertSchemaToOpenApiSchema(endpoint.meta.res) : {};
-
-		let desc = (endpoint.meta.desc ? endpoint.meta.desc[lang] : 'No description provided.') + '\n\n';
-		desc += `**Credential required**: *${endpoint.meta.requireCredential ? 'Yes' : 'No'}*`;
-		if (endpoint.meta.kind) {
-			const kind = endpoint.meta.kind;
-			desc += ` / **Permission**: *${kind}*`;
-		}
-
-		const info = {
-			operationId: endpoint.name,
-			summary: endpoint.name,
-			description: desc,
-			externalDocs: {
-				description: 'Source code',
-				url: `https://github.com/syuilo/misskey/blob/develop/src/server/api/endpoints/${endpoint.name}.ts`
-			},
-			...(endpoint.meta.tags ? {
-				tags: [endpoint.meta.tags[0]]
-			} : {}),
-			...(endpoint.meta.requireCredential ? {
-				security: [{
-					ApiKeyAuth: []
-				}]
-			} : {}),
-			requestBody: {
-				required: true,
-				content: {
-					'application/json': {
-						schema: {
-							type: 'object',
-							...(required.length > 0 ? { required } : {}),
-							properties: endpoint.meta.params ? genProps(porops) : {}
+		},
+		responses: {
+			...(endpoint.meta.res ? {
+				'200': {
+					description: 'OK (with results)',
+					content: {
+						'application/json': {
+							schema: resSchema
 						}
 					}
 				}
+			} : {
+				'204': {
+					description: 'OK (without any results)',
+				}
+			}),
+			'400': {
+				description: 'Client error',
+				content: {
+					'application/json': {
+						schema: {
+							$ref: '#/components/schemas/Error'
+						},
+						examples: { ...errors, ...basicErrors['400'] }
+					}
+				}
 			},
-			responses: {
-				...(endpoint.meta.res ? {
-					'200': {
-						description: 'OK (with results)',
-						content: {
-							'application/json': {
-								schema: resSchema
-							}
-						}
+			'401': {
+				description: 'Authentication error',
+				content: {
+					'application/json': {
+						schema: {
+							$ref: '#/components/schemas/Error'
+						},
+						examples: basicErrors['401']
 					}
-				} : {
-					'204': {
-						description: 'OK (without any results)',
+				}
+			},
+			'403': {
+				description: 'Forbiddon error',
+				content: {
+					'application/json': {
+						schema: {
+							$ref: '#/components/schemas/Error'
+						},
+						examples: basicErrors['403']
 					}
-				}),
-				'400': {
-					description: 'Client error',
+				}
+			},
+			'418': {
+				description: 'I\'m Ai',
+				content: {
+					'application/json': {
+						schema: {
+							$ref: '#/components/schemas/Error'
+						},
+						examples: basicErrors['418']
+					}
+				}
+			},
+			...(endpoint.meta.limit ? {
+				'429': {
+					description: 'To many requests',
 					content: {
 						'application/json': {
 							schema: {
 								$ref: '#/components/schemas/Error'
 							},
-							examples: { ...errors, ...basicErrors['400'] }
+							examples: basicErrors['429']
 						}
 					}
-				},
-				'401': {
-					description: 'Authentication error',
-					content: {
-						'application/json': {
-							schema: {
-								$ref: '#/components/schemas/Error'
-							},
-							examples: basicErrors['401']
-						}
+				}
+			} : {}),
+			'500': {
+				description: 'Internal server error',
+				content: {
+					'application/json': {
+						schema: {
+							$ref: '#/components/schemas/Error'
+						},
+						examples: basicErrors['500']
 					}
-				},
-				'403': {
-					description: 'Forbiddon error',
-					content: {
-						'application/json': {
-							schema: {
-								$ref: '#/components/schemas/Error'
-							},
-							examples: basicErrors['403']
-						}
-					}
-				},
-				'418': {
-					description: 'I\'m Ai',
-					content: {
-						'application/json': {
-							schema: {
-								$ref: '#/components/schemas/Error'
-							},
-							examples: basicErrors['418']
-						}
-					}
-				},
-				...(endpoint.meta.limit ? {
-					'429': {
-						description: 'To many requests',
-						content: {
-							'application/json': {
-								schema: {
-									$ref: '#/components/schemas/Error'
-								},
-								examples: basicErrors['429']
-							}
-						}
-					}
-				} : {}),
-				'500': {
-					description: 'Internal server error',
-					content: {
-						'application/json': {
-							schema: {
-								$ref: '#/components/schemas/Error'
-							},
-							examples: basicErrors['500']
-						}
-					}
-				},
-			}
-		};
+				}
+			},
+		}
+	};
 
+	return info;
+}
+
+export function genOpenapiSpec(lang = 'ja-JP') {
+	const spec = {
+		openapi: '3.0.0',
+
+		info: {
+			version: 'v1',
+			title: 'Misskey API',
+			description: getDescription(lang),
+			'x-logo': { url: '/assets/api-doc.png' }
+		},
+
+		externalDocs: {
+			description: 'Repository',
+			url: 'https://github.com/syuilo/misskey'
+		},
+
+		servers: [{
+			url: config.apiUrl
+		}],
+
+		paths: {} as any,
+
+		components: {
+			schemas: schemas,
+
+			securitySchemes: {
+				ApiKeyAuth: {
+					type: 'apiKey',
+					in: 'body',
+					name: 'i'
+				}
+			}
+		}
+	};
+
+	for (const endpoint of endpoints.filter(ep => !ep.meta.secure)) {
 		spec.paths['/' + endpoint.name] = {
-			post: info
+			post: genOpenapiSpecForEndpoint(endpoint, lang)
 		};
 	}