JSON to Rust Struct
Generate serde-ready Rust structs from a sample JSON document.
HTTP Status Codes
Every HTTP status code, searchable, with what it actually means.
Quick Tool Overview
The complete HTTP status code list, searchable by number, name or intent, with a practical explanation of each rather than its specification wording — including which codes require a companion header to be implemented correctly.
- What it does
- Lists and explains every HTTP status code
- You give it
- A number, a name or a phrase
- You get back
- The matching codes with what they mean in practice
- Best for
- Choosing the right code, and decoding an unexpected one
About the HTTP Status Codes
The complete list of HTTP status codes, searchable by number, by name or by what you are trying to describe. Each entry says what the code means in practice rather than quoting the specification back at you.
The distinctions that actually matter are spelled out: why 401 means unauthenticated despite being named Unauthorized, why 403 means authentication will not help, when to send 422 rather than 400, and why 307 exists when 302 already did. Codes that require a companion header — 405 needs Allow, 401 needs WWW-Authenticate, 429 should carry Retry-After — are marked, because omitting them is the most common way a correct status code is still implemented wrongly.
Key features of the HTTP Status Codes
Practical meanings
Why 401 means unauthenticated, why 403 means authenticating will not help, and when 422 beats 400 — the distinctions that decide which code to send.
Companion headers flagged
405 needs Allow, 401 needs WWW-Authenticate, 429 should carry Retry-After. Omitting those is the usual way a correct code is still implemented wrongly.
Search anything
Type a number, part of a name, or a phrase such as "rate limit" and the matching codes surface.
Filter by class
Narrow to informational, success, redirection, client error or server error when you are choosing rather than looking up.
The whole range
From 100 through 511, including the WebDAV codes and 418, which every framework implements anyway.
How to use the HTTP Status Codes
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1
Search or browse
Type a number, a name, or a phrase such as "rate limit".
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2
Filter by class
Narrow to informational, success, redirection, client error or server error.
-
3
Read what it means
Each code has a practical explanation, not just its official name.
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4
Copy what you need
Click a code or its name to copy it.
Frequently asked questions
401 means the server does not know who you are — authenticate and try again. 403 means it knows exactly who you are and is refusing anyway, so authenticating will not help.
400 when the request cannot be parsed at all, such as malformed JSON. 422 when it parses fine but the values are wrong. Many APIs use 400 for both, which is acceptable but less informative.
301 only when the move is genuinely permanent — browsers and search engines cache it aggressively and it is very hard to undo. For anything temporary use 302, or 307 if the method must be preserved.
It began as an April Fools joke in 1998 and was never a serious part of HTTP. It is, however, implemented by most major frameworks and defended often enough that it is not going away.
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