Express Error Handling: Stop Your Node.js App From Crashing | Node.js Course #9

Express Error Handling & Async Errors – Lecture 9 of the Node.js & Express Full Course, a free Node.js and Express.js tutorial for beginners. Learn Express error handling, async errors Express, error middleware with hands-on code examples for backend JavaScript development. Lecture 9 shows how to handle errors in Express the professional way: error-handling middleware with four arguments, a custom AppError class, async errors in Express 4 and 5, consistent JSON error responses, hiding stack traces in production, and handling crashes at the process level. What you'll learn • How Express error middleware works (err, req, res, next) • Throwing vs next(err) • Async errors in Express 4 vs Express 5 • A custom AppError class with status codes • unhandledRejection and graceful shutdown Chapters 00:00 Intro 00:59 Error-handling middleware 02:32 Async errors: Express 4 vs 5 04:13 A custom AppError class 05:38 Production-ready error handler 06:48 Recap 07:36 Next: project structure Altered or synthetic content: The presenter visuals and narration in this video are AI-generated/AI-assisted from the instructor's own photo and an original teaching script. All code, diagrams and teaching content are original. #NodeJS #ExpressJS #ExpressErrorHandling