How can I use middleware for error handling in my application?

How can I use middleware for error handling in my application?

You can use middleware in your application to catch errors and handle them gracefully. This allows you to centralize error handling.

Can you give me an example of how to implement this in Express.js?

Sure! In Express.js, you can create an error-handling middleware function like this:

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});

What if I want to handle different types of errors differently?

You can check the error type within your middleware and respond accordingly. For example:

app.use((err, req, res, next) => {
  if (err instanceof ValidationError) {
    res.status(400).send(err.message);
  } else {
    res.status(500).send('Internal Server Error');
  }
});

Is it possible to log errors to an external service?

Yes, you can integrate logging libraries or services like Winston or Sentry to log errors in your middleware.