Custom Software, Web & App Development Company – Logix Built

Building a Real-Time Chat Application with


Real-time chat applications have become an integral part of our daily lives, connecting people across the globe instantly. Whether it’s for social interactions, business collaborations, or customer support, building a real-time chat application is a valuable skill for web developers. In this blog, we’ll walk you through the process of creating a real-time chat application using, a popular and powerful JavaScript library for enabling real-time, bidirectional communication.


Before we dive into building the chat application, make sure you have the following prerequisites in place:
  • Basic knowledge of JavaScript and web development.
  • Node.js and npm installed on your machine.
  • A text editor or integrated development environment (IDE) of your choice.

Setting Up the Project

Let’s get started by creating a new project directory and initializing it with Node.js and npm:

1. Open your terminal and create a project directory

shell mkdir real-time-chat-app cd real-time-chat-app

2. Initialize the project

shell npm init -y

3. Install and Express (a web application framework for Node.js)

shell npm install express

Creating the Server

1. Create a server using Express and in a file named server.js

   const express = require('express');
   const http = require('http');
   const socketIo = require('');


   const app = express();
   const server = http.createServer(app);
   const io = socketIo(server);


   // Handle incoming socket connections
   io.on('connection', (socket) => {
     console.log('A user connected');


     // Handle chat messages
     socket.on('chat message', (message) => {
       io.emit('chat message', message); // Broadcast the message to all connected clients


     // Handle disconnects
     socket.on('disconnect', () => {
       console.log('User disconnected');


   // Start the server
   const port = process.env.PORT || 3000;
   server.listen(port, () => {
     console.log(Server listening on port ${port});

Creating the Client

1. Create an HTML file named index.html for the chat client

   <!DOCTYPE html>
     <title>Real-Time Chat</title>
     <ul id="messages"></ul>
     <input id="message" autocomplete="off" /><button>Send</button>
     <script src="/"></script>
       const socket = io();


       // Handle sending messages
       const messageInput = document.getElementById('message');
       const form = document.querySelector('form');
       form.addEventListener('submit', (e) => {
         socket.emit('chat message', messageInput.value);
         messageInput.value = '';
         return false;


       // Handle receiving messages
       socket.on('chat message', (message) => {
         const messages = document.getElementById('messages');
         const li = document.createElement('li');
         li.textContent = message;

2. In the server.js file, serve the index.html file using Express

javascript app.get('/', (req, res) => { res.sendFile(__dirname + '/index.html'); });

Running the Application

Now that you have the server and client in place, follow these steps to run the chat application:

1. Start the server

shell node server.js

2. Open your web browser and navigate to [http://localhost:3000.](http://localhost:3000/%60.)

3. You can open multiple browser tabs and chat with yourself in real time.

Congratulations! You’ve successfully built a real-time chat application using This is a basic example, and you can enhance it by adding features like user authentication, private messaging, and more.

Building real-time applications is an exciting field in web development, and simplifies the process. Explore its documentation to discover more possibilities and take your real-time chat application to the next level. Happy coding!

Scroll to Top