HTTP Status Codes

HTTP status codes reference with search by code, name, category, and typical API scenarios.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

HTTP Status Codes is a free online reference for API, backend/frontend debugging, nginx logs, fetch/axios errors, integrations, and documentation. Processing runs locally in your browser.

What it does

Output

Processing

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How to use

Enter an HTTP code such as 404, 422, or 502, or a search word: unauthorized, redirect, rate limit.
Choose category 1xx, 2xx, 3xx, 4xx, or 5xx to filter the list if needed.
Open a code card and see meaning, typical scenario, common cause, and sample API response.
Copy the reference or JSON example for documentation, issues, API responses, or dev team communication.

More about this tool

HTTP Status Codes is a reference for API, backend/frontend debugging, nginx logs, fetch/axios errors, integrations, and documentation.

Quickly find meaning of codes 200, 201, 204, 301, 302, 400, 401, 403, 404, 409, 422, 429, 500, 502, 503, 504, and others.

For each code the tool can show category, short explanation, when to use it, common cause, sample JSON response, and similar codes that are often confused.

Processing runs locally in your browser.

Fast search by HTTP code
Search by name and error meaning
Categories 1xx, 2xx, 3xx, 4xx, and 5xx
API response examples
Hints for similar codes
Useful for API, logs, fetch, axios, and backend debugging
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What is an HTTP status code?

An HTTP status code is a numeric server response code showing request result: success, redirect, client error, or server error.

What do 2xx, 3xx, 4xx, and 5xx mean?

2xx means success, 3xx redirect, 4xx client/request error, 5xx server or gateway error.

How is 401 different from 403?

401 usually means the user is not authenticated or the token is invalid. 403 means the user is known but lacks permission for the resource or action.

How is 400 different from 422?

400 is used for a bad request in general. 422 is often used when the request is syntactically valid but data fails business validation.

What does 404 mean?

404 Not Found means the server did not find the resource at the given URL or ID.

How are 500, 502, 503, and 504 different?

500 is an internal application or server error. 502 means a gateway got a bad upstream response. 503 means service temporarily unavailable. 504 means a gateway timed out waiting for upstream.

Which code to return after creating an object?

Usually 201 Created, often with the created object or a link to it.

Which code for an empty successful response body?

204 No Content is often used for successful requests with no response body.

Does the tool execute HTTP requests?

No. This is an HTTP codes reference. It does not send requests or check real URLs.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

How to use

Enter an HTTP code such as 404, 422, or 502, or a search word: unauthorized, redirect, rate limit.

Choose category 1xx, 2xx, 3xx, 4xx, or 5xx to filter the list if needed.

Open a code card and see meaning, typical scenario, common cause, and sample API response.

Copy the reference or JSON example for documentation, issues, API responses, or dev team communication.

More about this tool

HTTP Status Codes is a reference for API, backend/frontend debugging, nginx logs, fetch/axios errors, integrations, and documentation.

Quickly find meaning of codes 200, 201, 204, 301, 302, 400, 401, 403, 404, 409, 422, 429, 500, 502, 503, 504, and others.

For each code the tool can show category, short explanation, when to use it, common cause, sample JSON response, and similar codes that are often confused.

Processing runs locally in your browser.

Fast search by HTTP code
Search by name and error meaning
Categories 1xx, 2xx, 3xx, 4xx, and 5xx
API response examples
Hints for similar codes
Useful for API, logs, fetch, axios, and backend debugging
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What is an HTTP status code?

An HTTP status code is a numeric server response code showing request result: success, redirect, client error, or server error.

What do 2xx, 3xx, 4xx, and 5xx mean?

2xx means success, 3xx redirect, 4xx client/request error, 5xx server or gateway error.

How is 401 different from 403?

401 usually means the user is not authenticated or the token is invalid. 403 means the user is known but lacks permission for the resource or action.

How is 400 different from 422?

400 is used for a bad request in general. 422 is often used when the request is syntactically valid but data fails business validation.

What does 404 mean?

404 Not Found means the server did not find the resource at the given URL or ID.

How are 500, 502, 503, and 504 different?

500 is an internal application or server error. 502 means a gateway got a bad upstream response. 503 means service temporarily unavailable. 504 means a gateway timed out waiting for upstream.

Which code to return after creating an object?

Usually 201 Created, often with the created object or a link to it.

Which code for an empty successful response body?

204 No Content is often used for successful requests with no response body.

Does the tool execute HTTP requests?

No. This is an HTTP codes reference. It does not send requests or check real URLs.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.