How to Write Middleware in MERN Backend

Learn how to implement middleware in a MERN stack backend to enhance security and efficiency. Explore the crucial role of middleware as an intermediary that processes requests before they reach the controller. Discover how to streamline user authentication by implementing a middleware function that decodes JWT tokens, verifies user identity against the database, and attaches user data to the request object. Master the technique of securing routes and managing user sessions while adhering to the DRY principle, ultimately creating a more robust and maintainable MERN application.