HTTP status code reference · Guide
HTTP Status Codes Explained
Status codes are the API’s way of summarising what happened. Understanding the categories makes any code readable.
Categories at a glance
2xx means it worked, 3xx means look elsewhere, 4xx means the request was wrong, and 5xx means the server broke. That first digit is the fastest read on any response.
Codes worth knowing
200 OK, 201 Created, 301 and 302 redirects, 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, 422 Unprocessable Content and 500 Internal Server Error cover the bulk of what you will meet.
Frequently asked questions
Can I use this for production work?
Yes, for inspection, formatting and quick generation. Still review the output before committing it to production code or configuration.
Ready to try it?
Open the free browser-based HTTP status code reference and apply what you just read — no sign-up, runs locally.
Open the HTTP status code reference tool