What are callbacks in Express.js?

Can you explain what callbacks are in Express.js?

Sure! In Express.js, callbacks are functions that are passed as arguments to other functions, allowing you to handle asynchronous operations.

How do callbacks work in middleware?

In middleware, callbacks are used to pass control to the next middleware function. You call next() to move to the next one.

Can you give me an example of a callback in a route?

Absolutely! Here's a simple example: app.get('/example', (req, res) => { res.send('Hello World!'); }); The function passed is the callback.

What happens if I forget to call the next function?

If you forget to call next(), the request will hang, and the client will not receive a response.