This is a repackaged open-source software product wherein additional charges apply for support and for providing it in a simple consumable AMI. MERN stack consists of four components to build an end-to-end web application, namely, MongoDB, Expressjs, Reactjs, and Nodejs. The application involves a backend server using Node.js and Express.js, connected to a MongoDB database, and a frontend application built with React.js. MERN is one of the most popular full-stack Javascript stacks that can be used to build scalable, production-ready web applications. The main purpose of using the MERN stack is to develop apps using JavaScript only. This is because the four technologies that make up the technology stack are all JS-based.