Description: A middleware function is a function that can perform operations on request and response objects, and can call the next middleware function. In the context of web development, middleware acts as an intermediary that allows manipulation of HTTP requests before they reach their final destination, which is usually a specific route. These functions can perform various tasks, such as user authentication, data validation, error handling, and modification of requests and responses. Middleware is fundamental to the architecture of web applications, as it allows for separation of concerns and code reuse. Additionally, they can be applied globally to all routes or specifically to individual routes, providing flexibility in request handling. The ability to chain multiple middleware functions allows for building complex and customized workflows, enhancing code modularity and maintainability. In summary, middleware functions are powerful tools that facilitate the management of interactions between clients and servers, optimizing web application development.
