How to use in Express.js 4, Express-generator’s /bin/www, and JavaScript?

Estimated read time 2 min read

To use in an Express.js 4 application created with the Express generator, you’ll need to perform the following steps:

  1. Install the and packages:
npm install --save
  1. In the /bin/www file, set up the server:
// /bin/www

var app = require('../app');
var http = require('http');
var io = require('')();

var server = http.createServer(app);

server.on('error', onError);
server.on('listening', onListening);

  1. In a separate file, such as /routes/index.js, set up the event listeners:
// /routes/index.js

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

router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });

var socket = io.connect('http://localhost:3000');
socket.on('connect', function() {
  console.log('Connected to server');

socket.on('event', function(data) {
  console.log('Received event:', data);

socket.on('disconnect', function() {
  console.log('Disconnected from server');

module.exports = router;

In this example, the library is used to connect to the server and listen for events. You can emit events from the client-side code by calling the emit method on the socket object, and you can handle those events on the server-side by listening to the socket events.

Note that in this example, the server is attached to the Express server created in the /bin/www file, and the client-side code is included in the /routes/index.js file. You can structure your application as needed, but this example demonstrates one possible way to set up in an Express.js 4 application.

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