JavaScript – codewindow.in

In this example, the loggerMiddleware function is a custom middleware that logs information about the incoming requests. It uses console.log to display the HTTP method and URL of the request. The app.use() method is used to register the middleware, and it will be executed for every incoming request before the route handler for the root path (‘/’).

Middleware functions offer several benefits in server-side development:

1. Modularity: Middleware functions allow developers to modularize the application’s functionality into smaller, reusable components. This improves code organization and maintainability.

2. Chaining: Multiple middleware functions can be chained together, each handling specific tasks, leading to a clean and organized codebase.

3. Customization: Middleware functions can be tailored to specific routes or groups of routes, providing flexibility in handling different parts of the application.

4. Error Handling: Middleware functions can be used to handle errors and pass them to an error-handling middleware to centralize error management.

5. Authentication and Authorization: Middleware functions can be used for implementing authentication and authorization checks before granting access to certain routes.

6. Request and Response Manipulation: Middleware functions can modify the request or response objects, enabling features like request data parsing, response compression, and adding custom headers.

7. Logging and Debugging: Middleware functions can be used to log important information about incoming requests and responses, making debugging and monitoring easier.