diff --git a/.gitignore b/.gitignore
index 1f5bd69675..51f1480de2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 npm-debug.log
 *.pem
 run.bat
+api-docs.json
diff --git a/package.json b/package.json
index 13cf6dcaa1..e06b1dff41 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "scripts": {
     "config": "node ./init.js",
     "start": "node ./built/index.js",
+    "swagger": "node ./swagger.js",
     "build": "gulp build",
     "rebuild": "gulp rebuild",
     "clean": "gulp clean",
@@ -120,6 +121,7 @@
     "sortablejs": "1.5.0-rc1",
     "subdomain": "1.2.0",
     "summaly": "1.2.7",
+    "swagger-jsdoc": "^1.8.4",
     "syuilo-password-strength": "0.0.1",
     "syuilo-transformify": "0.1.2",
     "tcp-port-used": "0.1.2",
diff --git a/src/api/endpoints/auth/session/generate.js b/src/api/endpoints/auth/session/generate.js
index bb49cf090d..07ff8a8195 100644
--- a/src/api/endpoints/auth/session/generate.js
+++ b/src/api/endpoints/auth/session/generate.js
@@ -7,6 +7,36 @@ import * as uuid from 'uuid';
 import App from '../../../models/app';
 import AuthSess from '../../../models/auth-session';
 
+/**
+ * @swagger
+ * /auth/session/generate:
+ *   post:
+ *     summary: Generate a session
+ *     parameters:
+ *       -
+ *         name: app_secret
+ *         in: formData
+ *         required: true
+ *         type: string
+ *         
+ *     responses:
+ *       200:
+ *         description: OK
+ *         schema:
+ *           type: object
+ *           properties:
+ *             token:
+ *               type: string
+ *               description: API Token
+ *             url:
+ *               type: string
+ *               description: Callback URL
+ *       400:
+ *         description: Failed
+ *         schema:
+ *           $ref: "#/definitions/Error"
+ */
+
 /**
  * Generate a session
  *
diff --git a/swagger.js b/swagger.js
new file mode 100644
index 0000000000..eb82a72516
--- /dev/null
+++ b/swagger.js
@@ -0,0 +1,41 @@
+const swaggerJSDoc = require('swagger-jsdoc');
+const fs = require('fs');
+
+const apiRoot = './src/api/endpoints';
+const files = [
+  'auth/session/generate.js'
+];
+
+const errorDefinition = {
+  'type': 'object',
+  'properties':{
+    'error': {
+      'type': 'string',
+      'description': 'Error message'
+    }
+  }
+} 
+
+var options = {
+  swaggerDefinition: {
+    swagger: '2.0',
+    info: {
+      title: 'Misskey API',
+      version: 'aoi',
+    },
+    consumes: [
+      'application/x-www-form-urlencoded'
+    ],
+    produces: [
+      'application/json'
+    ]
+  },
+  apis: []
+};
+options.apis = files.map(c => {return `${apiRoot}/${c}`;});
+
+var swaggerSpec = swaggerJSDoc(options);
+swaggerSpec.definitions.Error = errorDefinition;
+
+fs.writeFileSync('api-docs.json', JSON.stringify(swaggerSpec));
+