How is Middleware Chaining Useful?

Middleware Chaining in Express.js is useful because it allows a modular and organized approach to managing and handling HTTP requests and responses. Below are some of the points that state why Middleware Chaining is useful in Express.js.

• Modularity: In the middleware function there are units of functionality that are independent, so due to this the managing and organizing of code become easier. Also, they have been reused across various routes or applications.
• Sequential Execution: The order of Middleware functions execution is sequential. This sequential order allows developers to properly control the overall flow of the request-response cycle and also performs the functional tasks in a specific order.
• Error Handling: Middleware Chaining allows error handling where if an error occurs during the request-response tasks then the middleware function can call the next function with the error object and execute the error-handling middleware.
• Authentication and Authorization: The middleware functions are also used for implementing authentication and authentication. These middleware functions can be chained together to perform the different levels of access control within the application.

In Express JS there is the process of Middleware chaining by which multiple middleware functions sequentially can be processed and also can be able to modify the incoming requests before they reach the final route handler. In this article, we will see the concept of Middleware Chaining in Express JS with a proper example demonstration.