Express.js Error Handling Examples – next(err), 404s, Sync & Async Errors (Complete Guide)
Learn how to properly handle errors in Express.js — the right way. In this tutorial, you'll understand how to manage 404 Not Found errors, handled and unhandled errors, and especially async error handling using next(err). We break down the role of app.use(), why order matters, and how to avoid crashing your app with async bugs.
Whether you're new to Express or looking to level up your backend skills, this is the most complete and beginner-friendly explanation of Express error handling.
🔍 What You'll Learn:
How app.use() middleware works
How to handle 404 errors in Express
What makes the error handler different (4 parameters)
What happens with next(err)
How Express handles sync vs async errors
How to safely handle async/await errors
Real code examples and clean explanations
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