express.Router()
Creates a modular, mountable group of routes and middleware.
Syntax
const router = express.Router([options])Parameters
| Name | Type | Required | Description |
|---|---|---|---|
options | object | No | `caseSensitive`, `strict`, `mergeParams` (inherit params from the parent router). |
Returns
Router — A router instance with the same routing API as app.
Examples
// routes/users.js
import { Router } from 'express';
const router = Router();
router.get('/', (req, res) => res.json(listUsers()));
router.get('/:id', (req, res) => res.json(getUser(req.params.id)));
export default router;
// app.js
import usersRouter from './routes/users.js';
app.use('/api/users', usersRouter);
Output
$ curl localhost:3000/api/users/1
{"id":"1"}
Notes
Routers let you split a large app into feature modules mounted with
`app.use(prefix, router)`. Paths inside the router are relative to
the mount point. Use `mergeParams: true` to access params from a
parent router (e.g. nested resources).