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Abstract: With the development and enhancement in internet, more and more people have been choosing chatting tools for communication. Applications such as these facilitates communication over great distances. Therefore this application must both be real time and multi-platform to be used by many users. Chatting is a method of using technology to bring people and ideas together despite of the geographical barriers. The technology has been available for years but the acceptance was quite recent. Our project is an example of chat server. It is made up of two applications – the client application, which runs on the user’s web browser and server application, runs on any hosting servers on the network. To start chatting client should get connected to server where they can do private and group chat. Security measures were taken during the last one. The programming tools used in building this application is React.js, Node.js with Express framework and Mongo DB database. The text communication is transferred through and from servers and the data transmission is facilitated through point to point connection between servers. The advantage of building chat application with MERN is the fact that one can benefit from its enhanced flexibility. One can basically avoid any syntax error or any confusion by just coding in one programming language, Java script. While there are many, MEAN and MERN are just two of the popular stack that have evolved out of Java script. Both stacks are made up of open source components and offer an end-to-end framework for building comprehensive web apps that enable browsers to connect with databases. The common theme between the two is Java script and this is also the key benefit of using either stack. In order to understand MERN stack, we need to understand the four components that make up the MERN stack, namely- Mongo DB, Express.js, React and Node.js.