Modularized Express

index.js

var express = require('express');
var server = express();

server.use('/products', require('./products'))

server.listen(8080);

products.js

var express = require('express');
var products = module.exports = express();
var Products = require('./lib/products');

products.get('/', function (req, res, next) {
  Products.find(function (err, products) {
    if (err) {
      return next(err);
    }
    
    res.json(products);    
  });  
})