Building Real-Time Chat Application using MERN Stack

In today’s digital age, communication plays a vital role in our personal and professional lives. Real-time chat applications have become an integral part of our daily routine. Whether it’s connecting with friends and family or collaborating with colleagues, the need for instant messaging is ever-growing. In this article, we will explore how to build a real-time chat application using the MERN stack.

The MERN stack, which stands for MongoDB, Express.js, React.js, and Node.js, is a powerful combination of technologies that allows developers to build robust and scalable web applications. It provides a seamless integration between the front end and back end, making it an ideal choice for building real-time chat applications.

To get started, let’s take a closer look at each component of the MERN stack and its role in building our chat application.


MongoDB is a NoSQL database that stores data in a flexible, document-like format called BSON (Binary JSON). It is highly scalable and provides excellent performance for real-time applications. In our chat application, we will use MongoDB to store and retrieve chat messages.


Express.js is a fast and minimalist web application framework for Node.js. It simplifies the process of building web applications by providing a set of robust features and middleware. In our chat application, Express.js will handle the server-side logic and API endpoints.


React.js is a popular JavaScript library for building user interfaces. It allows developers to create reusable UI components and efficiently update the user interface in response to changes in data. In our chat application, React.js will handle the front-end development and user interactions.


Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine. It allows developers to run JavaScript code on the server side, making it ideal for building scalable network applications. In our chat application, Node.js will handle the server-side logic and real-time communication using WebSockets.