HTTP Status Codes

Part of the Full Stack Developer Roadmap.

Summary

Three-digit codes (200, 201, 400, 401, 404, 500...) that tell the client what happened with their request — your frontend will branch its behavior based on these constantly.

How to Learn This

1Memorize the 5 status code classes (1xx-5xx) and what each range signals.
2Practice returning and handling the correct status code for common scenarios.
3Learn the difference between 401 (unauthenticated) and 403 (unauthorized).

JSON

Browsers vs Servers

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