HTTP Status Codes - Free Online Tool | PivaBox

Quick reference for HTTP status codes with descriptions grouped by category

HTTP Status Codes Reference — Complete Guide to All HTTP Response Codes

1. Browse the complete HTTP status code reference organized by category: 1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, and 5xx Server Error. Each code includes its official description, common use cases, and practical examples.
2. Search for a specific code by number or keyword, or filter by category. The interactive reference shows detailed information about each status code, when to use it in your API, and common pitfalls to avoid.
3. Use the reference to design RESTful APIs correctly, debug HTTP responses, understand error logs, or study for technical interviews. Each code entry includes the official RFC reference number.

Frequently Asked Questions

Is the HTTP Status Codes reference free?

Yes, completely free. Access the full reference anytime — bookmark it for quick lookups during development and debugging.

Does this tool collect my browsing or search data?

No. This is a static reference page. All searching and filtering happens in your browser — no queries are sent to any server.

What are the most important HTTP status codes every developer should know?

Essential codes: 200 OK (request succeeded — the default for GET, PUT, PATCH), 201 Created (resource created — use for POST responses with a Location header), 204 No Content (success with no response body — use for DELETE), 301 Moved Permanently (URL has changed forever — search engines update their index), 302 Found (temporary redirect — use sparingly, prefer 307/308 for method preservation), 400 Bad Request (client sent invalid data — include error details in the response body), 401 Unauthorized (authentication required — the client must log in), 403 Forbidden (authenticated but not allowed — don't retry without changing permissions), 404 Not Found (resource doesn't exist — the most recognized code), 409 Conflict (resource state conflict — use for duplicate entries or version mismatches), 422 Unprocessable Entity (semantic validation error — the format is correct but the content is invalid), 429 Too Many Requests (rate limiting), 500 Internal Server Error (generic server failure — log details server-side, don't expose to client), 502 Bad Gateway, 503 Service Unavailable (server temporarily down — include a Retry-After header). For REST APIs, always use the most specific 4xx code available rather than defaulting to 400.