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# Router - Express

To split routing code in multiple files:

Routes and controllers . (opens new window)

Useful to group route handlers for a particular part of a site together and access them using a common route-prefix -› express.Router

# Example 1

// wiki.js - Wiki route module

const express = require('express');
const router = express.Router();

// Home page route
router.get('/', function(req, res) {
  res.send('Wiki home page');
});

// About page route
router.get('/about', function(req, res) {
  res.send('About this wiki');
});

module.exports = router;

Note: Adding routes to the Router object is just like adding routes to the app object

To use the router in the main app file, require() the route module (wiki.js), then call use() on the Express application to add the Router to the middleware handling path. The two routes will then be accessible from /wiki/ and /wiki/about/.

const wiki = require('./wiki.js');
// ...
app.use('/wiki', wiki);

# Example 2

folder /routes

router is like a mini-express-app:

const express = require('express');

const router = express.Router();

router.get('/add-product', (req, res, next) => {
  console.log('in the first middleware');
  res.send(
    '<form action="/product" method="POST"><input type="text" name="title"><button type="submit">add product</button></form>'
  );
});

router.post('/product', (req, res, next) => {
  console.log(req.body);
  res.redirect('/');
});

module.exports = router;

and import in the main app - app.js

and put the imported Object in app.use() (not calling the function)

const adminRoutes = require('./routes/admin');
app.use(adminRoutes)

the Order matters!

if all routes in a routes-file start with the same segment, you can add that as a filter in the main app:

	app.use('/admin', adminRoutes);

-> only routes starting with /admin will go into the 'adminRoutes'-File

← Middleware - Express →