What are the best practices for error handling in Express.js?

What are the best practices for error handling in Express.js?

In Express.js, it's important to use middleware for error handling. You should define an error-handling middleware function that takes four arguments: err, req, res, and next. This allows you to centralize your error handling.

Can you give me an example of an 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 different types of errors?

You can differentiate between different types of errors by checking the error properties. For instance, you can handle validation errors differently from server errors by checking err.name or err.status.

How can I log errors for later analysis?

You can use logging libraries like winston or morgan to log errors. Integrate them into your error-handling middleware to capture error details.