HTTP Status Code Lookup – Free Online Tool
Free HTTP Status Codes lookup tool with complete reference guide. Find meanings and descriptions for all HTTP response codes including 1xx informational, 2xx success, 3xx redirection, 4xx client error, and 5xx server error status codes. Perfect for debugging web applications and APIs.
Example Output
Each code with a one-line meaning and the typical scenario where you'd return it.
429 Too Many Requests — the user has sent too many requests in a given time (rate-limiting).
What is HTTP Status Code Lookup?
HTTP Status Code Lookup is a quick-reference table for every standard HTTP status code, grouped by class with searchable descriptions. Use it when reading an API response and the code isn't one you remember by heart, or when picking the right code to return from your own endpoint.
Why use this tool?
- 100% free with no hidden costs or daily limits
- Works offline after the first page load
- Lightweight page weight that loads quickly even on slow connections
- Built for developer workflows: copy-friendly output, syntax-aware highlighting where useful
- Works with very large inputs (multi-megabyte JSON, long regex patterns, big tables)
How to use
- Browse the full list grouped by class (1xx, 2xx, 3xx, 4xx, 5xx)
- Type a code or keyword (e.g. "418", "redirect") to filter instantly
- Click a code to see its description and a typical use case
Examples
Pick the right error code
User submits an invalid form? 400 Bad Request. Not authenticated? 401. Authenticated but no permission? 403. Resource gone forever? 410, not 404.
Recognise a 3xx redirect
301 = permanent (browsers cache), 302 = temporary, 307/308 = same as 302/301 but preserve method. Helpful when debugging redirect chains.
Common use cases
- Designing API responses with the correct semantic code
- Debugging a 4xx/5xx response without leaving the page
- Onboarding new engineers to HTTP semantics
- Writing documentation that needs accurate code references
Troubleshooting
- My code isn't in the list (e.g. 599).
- The list covers the IANA-registered standard codes. Non-standard codes (520-599 used by some CDNs/proxies) are typically vendor-specific — check your provider's docs.
Frequently Asked Questions
HTTP status codes are standardized codes returned by web servers to indicate the result of a request. They are grouped into classes: 1xx (informational), 2xx (success), 3xx (redirection), 4xx (client error), 5xx (server error).
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