What is middleware in an Express app?

What is middleware in an Express app?

Middleware in Express is a function that processes requests and responses in the application. It can modify the request, end the request-response cycle, or call the next middleware function.

Can you give me an example of middleware?

Sure! A common example is the body-parser middleware, which parses incoming request bodies in a middleware before your handlers, available under the req.body property.

How do I use middleware in my Express app?

You can use middleware by calling app.use(middlewareFunction) in your Express app, where middlewareFunction is your custom or third-party middleware.

What are some common middleware functions?

Some common middleware functions include logging, authentication, error handling, and body parsing.