Stop 04 · JavaScript & TypeScript for BackendTopics · 3/12
Error Handling
Part of the Backend Developer Roadmap
In short
Designing how your backend surfaces failures — custom error classes, centralized error middleware, and consistent error response shapes for API consumers.
How to learn this
- 1Create a custom `AppError` class carrying a status code and message.
- 2Build a centralized Express error-handling middleware that catches all thrown errors.
- 3Design a consistent JSON error response shape used across your entire API.
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