The MERN stack is a widely adopted full-stack development framework that simplifies the creation of modern web applications. Using JavaScript for both the frontend and backend enables developers to efficiently build robust, scalable, and dynamic applications. MERN stack is a JavaScript-based full-stack framework. It is a combination of MongoDB, Express.js, React.js, and Node.js to create dynamic and efficient web applications using only one language. Is MERN a full-stack solution? Yes, MERN is a full stack, following the traditional three-tier architectural pattern, including the front-end display tier (React.js), application tier (Express.js and Node.js), and database tier (MongoDB). Learn what the MERN stack is, how it works, and why it's popular. The MERN stack consists of MongoDB, Express.js, React, and Node.js, four technologies that enable developers to build dynamic and modern websites and applications.