What is the difference between "express.Router" and routing using "app.get"?

Question

I have an app with following code for routing:

var router = express.Router(); 
router.post('/routepath', function(req, res) {});

Now I have to put routing code in different files so I tried to use this approach, but it is not working perhaps because instead of express.Router() it uses:

app.post("/routepath", function (req, res) {});

How can I put routing in different files using express.Router()?

Why app.get, app.post, app.delete, etc, are not working in app.js after using express.Router() in them?

Answer 1

Here's a simple example:

// myroutes.js
var router = require('express').Router();

router.get('/', function(req, res) {
    res.send('Hello from the custom router!');
});

module.exports = router;

---

// main.js
var app = require('express')();

app.use('/routepath', require('./myroutes'));

app.get('/', function(req, res) {
    res.send('Hello from the root path!');
});

Here, app.use() is mounting the Router instance at /routepath, so that any routes added to the Router instance will be relative to /routepath.