What is middleware in Express.js?

Can you explain what middleware is in Express.js?

Middleware in Express.js refers to functions that have access to the request, response, and the next middleware function in the application’s request-response cycle.

What are some common examples of middleware?

Common examples include body-parser for parsing request bodies, cookie-parser for handling cookies, and morgan for logging requests.

How do I create my own middleware?

You can create your own middleware by defining a function that takes three parameters: req, res, and next. Call next() to pass control to the next middleware.

Can middleware be used for error handling?

Yes, middleware can be used for error handling by defining an error-handling middleware function with four parameters: err, req, res, and next.