diff --git a/lib/app.js b/lib/app.js
deleted file mode 100644
index 720da7f71..000000000
--- a/lib/app.js
+++ /dev/null
@@ -1,94 +0,0 @@
-const moduleAlias = require('module-alias');
-moduleAlias.addAlias('@', () => __dirname);
-
-require('./utils/request-wrapper');
-
-const Koa = require('koa');
-const logger = require('./utils/logger');
-
-const onerror = require('./middleware/onerror');
-const header = require('./middleware/header');
-const utf8 = require('./middleware/utf8');
-const cache = require('./middleware/cache');
-const parameter = require('./middleware/parameter');
-const template = require('./middleware/template');
-const favicon = require('koa-favicon');
-const serve = require('koa-static');
-const debug = require('./middleware/debug');
-const accessControl = require('./middleware/access-control');
-const antiHotlink = require('./middleware/anti-hotlink');
-const loadOnDemand = require('./middleware/load-on-demand');
-
-const router = require('./router');
-const core_router = require('./core-router');
-const protected_router = require('./protected-router');
-const mount = require('koa-mount');
-
-// API related
-const apiTemplate = require('./middleware/api-template');
-const api_router = require('./api-router');
-const apiResponseHandler = require('./middleware/api-response-handler');
-
-process.on('uncaughtException', (e) => {
-    logger.error('uncaughtException: ' + e);
-});
-
-const app = new Koa();
-app.proxy = true;
-
-// favicon
-app.use(favicon(__dirname + '/favicon.png', { maxAge: 31_536_000_000 }));
-app.use(serve(__dirname + '/static', { maxage: 31_536_000_000 }));
-
-// global error handing
-app.use(onerror);
-
-app.use(accessControl);
-
-// 7 debug
-app.context.debug = {
-    hitCache: 0,
-    request: 0,
-    etag: 0,
-    paths: [],
-    routes: [],
-    errorPaths: [],
-    errorRoutes: [],
-};
-app.use(debug);
-
-// 6 set header
-app.use(header);
-
-// 5 fix incorrect `utf-8` characters
-app.use(utf8);
-
-app.use(apiTemplate);
-app.use(apiResponseHandler());
-
-// 4 generate body
-app.use(template);
-// anti-hotlink
-app.use(antiHotlink);
-
-// 3 filter content
-app.use(parameter);
-
-// No Cache routes
-app.use(mount('/', core_router.routes())).use(core_router.allowedMethods());
-// API router
-app.use(mount('/api', api_router.routes())).use(api_router.allowedMethods());
-
-// 2 cache
-app.use(cache(app));
-
-// 1 load on demand
-app.use(loadOnDemand(app));
-
-// router
-app.use(mount('/', router.routes())).use(router.allowedMethods());
-
-// routes the require authentication
-app.use(mount('/protected', protected_router.routes())).use(protected_router.allowedMethods());
-
-module.exports = app;
diff --git a/lib/app.ts b/lib/app.ts
new file mode 100644
index 000000000..c4a66907f
--- /dev/null
+++ b/lib/app.ts
@@ -0,0 +1,52 @@
+import '@/utils/request-wrapper'
+
+import { Handler, Hono } from 'hono'
+
+import cache from '@/middleware/cache'
+import template from '@/middleware/template'
+import onerror from '@/middleware/onerror'
+import accessControl from '@/middleware/access-control'
+import debug from '@/middleware/debug'
+import header from '@/middleware/header'
+import antiHotlink from '@/middleware/anti-hotlink'
+import parameter from '@/middleware/parameter'
+import logger from '@/utils/logger'
+
+import routes from '@/routes'
+import index from '@/v3/index'
+import { errorHandler } from '@/errors'
+
+process.on('uncaughtException', (e) => {
+    logger.error('uncaughtException: ' + e);
+});
+
+const app = new Hono()
+
+app.use('*', onerror);
+app.use('*', accessControl);
+app.use('*', debug);
+app.use('*', template);
+app.use('*', header);
+app.use('*', antiHotlink);
+app.use('*', parameter);
+app.use('*', cache);
+
+for (const name in routes) {
+  const subApp = app.basePath(`/${name}`)
+  routes[name]({
+    get: (path, handler) => {
+      const wrapedHandler: Handler = async (ctx, ...args) => {
+        if (!ctx.get('data')) {
+          await handler(ctx, ...args)
+        }
+      }
+      subApp.get(path, wrapedHandler)
+    },
+  })
+}
+
+app.get('/', index)
+
+app.onError(errorHandler)
+
+export default app
diff --git a/lib/index.ts b/lib/index.ts
index 633baddf2..e846fd95f 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -1,55 +1,7 @@
-import '@/utils/request-wrapper'
-
 import { serve } from '@hono/node-server'
-import { Handler, Hono } from 'hono'
-
-import cache from '@/middleware/cache'
-import template from '@/middleware/template'
-import onerror from '@/middleware/onerror'
-import accessControl from '@/middleware/access-control'
-import debug from '@/middleware/debug'
-import header from '@/middleware/header'
-import antiHotlink from '@/middleware/anti-hotlink'
-import parameter from '@/middleware/parameter'
 import logger from '@/utils/logger'
-
-import routes from '@/routes'
-import index from '@/v3/index'
 import { config } from '@/config'
-import { errorHandler } from '@/errors'
-
-process.on('uncaughtException', (e) => {
-    logger.error('uncaughtException: ' + e);
-});
-
-const app = new Hono()
-
-app.use('*', onerror);
-app.use('*', accessControl);
-app.use('*', debug);
-app.use('*', template);
-app.use('*', header);
-app.use('*', antiHotlink);
-app.use('*', parameter);
-app.use('*', cache);
-
-for (const name in routes) {
-  const subApp = app.basePath(`/${name}`)
-  routes[name]({
-    get: (path, handler) => {
-      const wrapedHandler: Handler = async (ctx, ...args) => {
-        if (!ctx.get('data')) {
-          await handler(ctx, ...args)
-        }
-      }
-      subApp.get(path, wrapedHandler)
-    },
-  })
-}
-
-app.get('/', index)
-
-app.onError(errorHandler)
+import app from '@/app'
 
 const port = config.connect.port
 
@@ -60,3 +12,5 @@ serve({
   fetch: app.fetch,
   port
 })
+
+export default app