Middleware

Middleware provides a composable set of functions that can be used to modify incoming requests or outgoing responses. It is a chain of processed that is executed sequentially on each request.

Each middleware has access to the request and response objects, as well as the next middleware in the chain.

Express middleware is a powerful tool that can be used to improve the performance of web applications. In this section, we will take a look at some of the most popular express middleware modules and how they can be used to boost the performance of your web app.