How can I handle errors in my Express.js API?

How can I handle errors in my Express.js API?

You can handle errors in Express.js by using middleware. Define an error-handling middleware function that takes four arguments: err, req, res, and next. This function can then send a response based on the error.

Can you show me an example of error-handling middleware?

Sure! Here's a simple example:

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

What about handling validation errors?

For validation errors, you can check the request data before processing it. If validation fails, you can pass an error to the next middleware.

Is there a way to centralize error handling?

Yes, you can centralize error handling by creating a dedicated error-handling middleware and using it at the end of your middleware stack.