How to separate the routes and models from app.js using NodeJS and Express

Question

As of express 4.x Router is added to support your case.

A router object is an isolated instance of middleware and routes. You can think of it as a “mini-application,” capable only of performing middleware and routing functions. Every Express application has a built-in app router.

Example from expressjs site:

// routes/calendarRouter.js

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

// invoked for any requested passed to this router
router.use(function(req, res, next) {
  // .. some logic here .. like any other middleware
  next();
});

// will handle any request that ends in /events
// depends on where the router is "use()'d"
router.get('/events', function(req, res, next) {
  // ..
});

module.exports = router;

Then in app.js:

// skipping part that sets up app

var calendarRouter = require('./routes/calendarRouter');

// only requests to /calendar/* will be sent to our "router"
app.use('/calendar', calendarRouter);

// rest of logic

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