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How to Build A Facebook Messenger Clone

How to Build A Facebook Messenger Clone

Building a Facebook Messenger clone can be a great way to learn about real-time chat applications. We’ll cover everything from setting up your development environment to implementing chat features like sending and receiving messages, typing indicators, and others. By the end of this tutorial, you’ll have a working knowledge of how to build a real-time chat application with ZEGOCLOUD chat API.

What is Facebook Messenger

Facebook Messenger is a versatile instant messaging platform that has revolutionized the way we connect with friends, family, and colleagues. With its user-friendly interface and seamless integration with other Facebook features, Messenger has become a go-to communication tool for billions of people worldwide.

Considering the immense popularity and functionality of Facebook Messenger, building a clone app holds tremendous potential. A clone app can replicate the core features of Messenger while offering unique customization options to cater to specific user needs. This makes it an ideal solution for businesses and entrepreneurs looking to tap into the thriving messaging market and provide users with an alternative or enhanced experience.

By creating a clone app, you can leverage the familiarity and user base of Messenger while adding your own distinct features and branding. This is an opportunity to offer a seamless, personalized messaging experience and potentially carve out a niche in the competitive messaging app industry.

Best 3 APIs for Facebook Messenger Clone

When it comes to building a Facebook Messenger clone app, choosing the right APIs is crucial for ensuring a smooth and feature-rich user experience. Here are three top APIs, starting with ZEGOCLOUD, that can enhance your Messenger clone app and provide an exceptional messaging platform.


ZEGOCLOUD offers a comprehensive API suite for building messaging apps. It provides a wide range of features, including real-time messaging, push notifications, user authentication, and multimedia sharing. With ZEGOCLOUD’s API, you can easily integrate messaging capabilities into your clone app and ensure seamless communication between users. The messaging API also offers robust security measures to protect user data and privacy.

zegocloud adds chat feature

2. Twilio API

Twilio is a renowned cloud communications platform that offers a powerful API for messaging applications. With Twilio’s API, you can enable SMS and MMS messaging, voice calls, and even video calls within your Messenger clone app. Twilio API also provides intelligent routing capabilities, allowing your app to deliver messages efficiently and reliably. Additionally, the API offers various customization options to tailor the messaging experience to your app’s unique requirements.

twilio api

3. Firebase Cloud Messaging API

Firebase, Google’s mobile and web application development platform, provides the Firebase Cloud Messaging (FCM) API for enabling real-time messaging capabilities. FCM allows you to send messages to users on various platforms, including Android, iOS, and the web. The API supports both device-to-device and server-to-device messaging, making it an excellent choice for building a Facebook Messenger clone app. FCM also offers powerful features like topic messaging, delivery analytics, and notification management.

firebase api

How Do I Clone Facebook Messenger App

Is it possible to clone Facebook Messenger? If you want to create a unique messaging experience for users, cloning the Facebook Messenger app can be an exciting venture. To start, you’ll need a reliable communication SDK like the In-app Chat SDK offered by ZEGOCLOUD. This powerful SDK provides all the necessary tools and features to seamlessly integrate real-time messaging capabilities into your app.

By using ZEGOCLOUD’s In-app Chat API & SDK, you can simplify the process of building a Messenger app. The SDK offers pre-built chat functionality components such as text messaging, multimedia sharing, push notifications, and user authentication.

With this chat SDK, you can easily create a user-friendly interface, implement secure communication channels, and deliver a smooth messaging experience to users. The In-app Chat SDK provided by ZEGOCLOUD ensures that your Messenger app performs reliably while meeting the high standards set by established messaging platforms.


  • A ZEGOCLOUD developer account – Sign up
  • A computer with internet access
  • Web development fundamentals
  • Have NodeJS installed

If you have the preparations ready, follow these steps to get started with creating your real-time messaging apps:

Create you app

  1. Set up a project folder for audio and video by creating a folder following the structure outlined below:
├── assets
│   ├── css
│   │   └── index.css # Page styling.
│   └── js
│       ├── biz.js    # Your JavaScript code implementation here
│       └── zim.js    # zim sdk
├── index.html        # UI file of the application
  1. Paste the code provided below into the index.html.
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
    <meta name="renderer" content="webkit" />
    <link rel="stylesheet" href="assets/css/index.css" />


<script src="./assets/js/zim.js"></script>
<script src="./assets/js/biz.js"></script>

Integrate the SDK

To build a real-time messaging app, you first need to integrate ZEGOCLOUD’s In-chat SDK into your project. You can do this by following these steps:

  1. To install the required dependencies, run the following command:
npm i zego-zim-web
  1. In your project’s zim.js file, add the following import statement:
import { ZIM } from 'zego-zim-web';

Create a ZIM SDK instance

To initiate a ZIM instance, the initial step is to create an instance for each client who logs into the system. Let’s consider two clients, A and B. For them to exchange messages, both clients need to utilize the create method with the AppID from the Prerequisites section to generate their individual ZIM SDK instances.

var appID = xxxx; // The appID is a sequence of digits, not a text string.

// The [create] method creates a ZIM instance only once. Subsequent calls to the [create] method will return null.

ZIM.create({ appID });

// Use [getInstance] to avoid hot updates and multiple [create] calls.

var zim = ZIM.getInstance();

Set event callbacks

Prior to a client user’s login, it is essential to utilize the on method to customize event callbacks. This allows you to receive notifications for SDK errors and message-related callbacks, ensuring effective handling of various events.

// configure or set up a callback to receive error codes.

zim.on('error', function (zim, errorInfo) {
    console.log('error', errorInfo.code, errorInfo.message);

// Register a callback to be notified of connection status changes.

zim.on('connectionStateChanged', function (zim, { state, event, extendedData }) {
    console.log('connectionStateChanged', state, event, extendedData);
    // If the SDK logs out due to a long period of network disconnection, you will need to log in again.

    if (state == 0 && event == 3) {
        zim.login(userInfo, token)

// Configure a callback to be notified of incoming one-to-one messages.

zim.on('receivePeerMessage', function (zim, { messageList, fromConversationID }) {
    console.log('receivePeerMessage', messageList, fromConversationID);

// Configure a callback to be notified when the token expires.

zim.on('tokenWillExpire', function (zim, { second }) {
    console.log('tokenWillExpire', second);
    // To refresh the token, you have the option to utilize the renewToken method. 

        .then(function({ token }){
            // Renewed successfully.
            // Renew failed.

Log in to the ZIM SDK

To enable message exchange and token renewal after creating their ZIM SDK instances, both client A and client B must log in to the ZIM SDK. The following steps need to be followed by both clients:

  1. Create a user object using the ZIMUserInfo method.
  1. Utilize the login method, providing their respective user information and the Token obtained in the previous Prerequisites steps.
var userInfo = { userID: 'xxxx', userName: 'xxxx' };
var token = '';

zim.login(userInfo, token)
    .then(function () {
        // Login successful.
    .catch(function (err) {
        // Login failed.

Send messages

Once client A successfully logs in, they can start sending messages to client B.

The ZIM SDK currently supports various message types, including:

To send one-to-one messages, client A can call the sendMessage method, providing client B’s userID, message content, and relevant information. The ZIMMessageSentResult callback will notify client A about the successful delivery of the message.

Additionally, the onMessageAttached callback allows access to a temporary ZIMMessage object for messages that have not been sent yet. This enables implementation of customized business logic, such as retrieving the message ID before sending it or creating a loading UI effect when sending large content like videos.

//  Send one-to-one text messages. 

var toConversationID = ''; // Peer user's ID.
var conversationType = 0; // Message type; 1-on- chat: 0, in-room chat: 1, group chat:2 
var config = { 
    priority: 1, // Set message priority [1,2,3]. Low (default), Medium, or High.


var messageTextObj = { type: 1, message: 'Message text', extendedData: 'Additional information for the message (optional)' };

var notification = {
    onMessageAttached: function(message) {
        // todo: Loading

zim.sendMessage(messageTextObj, toConversationID, conversationType, config, notification)
    .then(function ({ message }) {
        // Successful message
    .catch(function (err) {
        // Failed message.

Receive messages

Once client B logs in, they will receive client A’s message through the specified callback in the receivePeerMessage method. This callback is already configured to handle incoming messages, ensuring client B can seamlessly receive and process messages from client A.

// Configure a callback to receive one-to-one messages.

zim.on('receivePeerMessage', function (zim, { messageList, fromConversationID }) {
    console.log('receivePeerMessage', messageList, fromConversationID);

Log out

In order to disconnect a client, call the logout method. This will end their session and log them out of the system.


Destroy the ZIM SDK instance

To completely remove the ZIM SDK instance, utilize the destroy method. This will effectively dismantle and remove all traces of the SDK instance from the system.


Run a Demo

To explore the features of a messaging application akin to Facebook’s Messenger, you can utilize the In-app Chat SDK sample demo app.


Building a Facebook Messenger clone is a great way to learn how to build a real-time messaging app. There are many different frameworks and libraries that you can use, but ZEGOCLOUD’s In-app Chat SDK is a great option for those who want a reliable and scalable solution. With ZEGOCLOUD’s In-app Chat SDK, you can quickly and easily build a high-quality messaging app that your users will love. Sign up to get started!

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