How can I use middleware in a MERN application?

How can I use middleware in a MERN application?

Middleware in a MERN application can be used to handle requests, responses, and errors. You can create custom middleware functions in your Express server.

Can you give me an example of a middleware function?

Sure! Here's a simple logging middleware:

function logger(req, res, next) {
    console.log(`${req.method} ${req.url}`);
    next();
}

This logs the HTTP method and URL of incoming requests.

How do I apply this middleware in my Express app?

You can apply it by using app.use(logger); in your Express app setup. This will ensure that the logger runs for every incoming request.

What other types of middleware can I use?

You can use middleware for authentication, error handling, parsing JSON, and serving static files, among others.