What is router middleware?

The term is composed of 2 words router and middleware. Middleware. It is a piece of code that comes in the middle of request and response . It kind of hijacks your request so that you can do anything that you want with your request or response eg: Modify the data or call the next middleware.

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What is application level middleware?

Application-level middleware METHOD() functions, where METHOD is the HTTP method of the request that the middleware function handles (such as GET, PUT, or POST) in lowercase . This example shows a middleware function with no mount path. The function is executed every time the app receives a request.

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