Node.js Error Handling

Introduction

Example

1/* this catches errors */
2app.use((err, req, res, next) => {
3  console.error(err.message);
4  res.status(500).send('Something broke on the server!');
5});

Key Points

• Error handling middleware takes four arguments instead of three.
• The arguments are `(err, req, res, next)`.
• It belongs at the very bottom of the file, after all other routes.
• Sending a 500 status code tells the browser the server failed.