Error Handling

Part of the Full Stack Developer Roadmap.

Summary

Designing how your backend surfaces failures — centralized error middleware and a consistent error response shape your frontend can handle predictably.

How to Learn This

1Build a centralized Express error-handling middleware that catches all thrown errors.
2Design a consistent JSON error shape, e.g. `{ error: { message, code } }`, used across your whole API.
3Handle errors on the frontend by checking this consistent shape, not guessing at each endpoint's format.

Request Validation

Environment Variables

More topics in Backend with Node.js & Express

Node.js Runtime & Event Loop NPM & Package Management Express Basics & Routing Middleware REST API Design Request Validation Environment Variables

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