What is error middleware in Node.js?

What is error middleware in Node.js?

Error middleware in Node.js is a function that handles errors in your application, allowing you to centralize error management.

How do I implement error middleware in my Express app?

To implement error middleware in Express, define a function with four parameters: err, req, res, and next. Then, use app.use() to register it.

Can you show me a code example?

Sure! Here's a simple example:

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

What types of errors can I handle with this middleware?

You can handle any errors that occur in your application, including syntax errors, database errors, and validation errors.