All utilities
Reference
HTTP status codes
Searchable reference of common HTTP response codes.
About this tool
Browse HTTP status codes with this practical reference for API development and debugging. The HTTP status reference explains response classes and common edge cases from informational to server error codes.
Engineers use it to align backend behavior, frontend handling, and monitoring alerts around consistent semantics. Clear status code usage improves observability and client integration reliability.
Frequently asked questions
- Why use an HTTP status reference during development?
- It helps choose correct response codes for each outcome so clients can handle success and failure conditions predictably.
- What is the difference between 4xx and 5xx?
- 4xx indicates client-side request issues, while 5xx indicates server-side failure or unavailable upstream behavior.
- Can this help improve API monitoring?
- Yes, understanding status semantics enables better alert thresholds and faster diagnosis of incident patterns.