optimize directory structure

lib/api_router.js

@@ -0,0 +1,28 @@
+const Router = require('koa-router');
+const router = new Router();
+const routes = require('./router');
+
+router.get('/routes/:name?', (ctx) => {
+    const allRoutes = Array.from(routes.stack);
+    allRoutes.shift();
+    const result = {};
+    let counter = 0;
+
+    allRoutes.forEach((i) => {
+        const path = i.path;
+        const top = path.split('/')[1];
+
+        if (!ctx.params.name || top === ctx.params.name) {
+            if (result[top]) {
+                result[top].routes.push(path);
+            } else {
+                result[top] = { routes: [path] };
+            }
+            counter++;
+        }
+    });
+
+    ctx.body = { counter, result };
+});
+
+module.exports = router;