Express is a widely used framework of Node.js for backend development. Express provides robust middleware support, which helps developers write reusable and maintainable code. In this blog, we are diving deep into middleware. By the end of this blog, you will understand all the important concepts of middleware. What is Middleware? Middleware is a function that runs during the request-response cycle, sitting between the incoming request and the final route handler. Every middleware function accepts three arguments: req (request) res (response) next req (Request) The request object contains incoming data sent by the client. res (Response) The response object is used by the server to send data back to the client. next() The next() function passes control to the next middleware function. If there is no next middleware, the request moves to the final route handler.…