What are the different types of middleware in Express.js?

What are the different types of middleware in Express.js?

In Express.js, middleware can be categorized into three main types: application-level, router-level, and error-handling middleware.

Can you explain application-level middleware?

Application-level middleware is bound to an instance of the Express application. It can execute code, modify the request and response objects, and end the request-response cycle.

What about router-level middleware?

Router-level middleware works similarly to application-level middleware but is bound to an instance of the Express Router. It can be used to modularize your routes.

And error-handling middleware?

Error-handling middleware is defined with four arguments: err, req, res, and next. It is used to handle errors that occur during request processing.