Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
HTTP Status Code Lookup
Browse all HTTP status codes with descriptions, troubleshooting guides, and common use cases.
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About HTTP Status Codes
HTTP status codes are standard response codes issued by web servers in response to client requests. They are grouped into five categories based on the first digit of the code:
- 1xx Informational — Request received, continuing process
- 2xx Success — Request successfully received, understood, and accepted
- 3xx Redirection — Further action needed to complete the request
- 4xx Client Error — Request contains bad syntax or cannot be fulfilled
- 5xx Server Error — Server failed to fulfill a valid request
How to Use This Tool
- Search by code or keyword — Type a status code (e.g.,
404) or a keyword (e.g., "redirect") in the search bar. - Filter by category — Use the category dropdown to show only 1xx, 2xx, 3xx, 4xx, or 5xx codes.
- Sort the results — Choose to sort by code number or by name alphabetically.
- Browse all codes — Scroll through the complete list or use the category cards for a quick overview.
- Click any code — Expand a status code card to see its full description, common use cases, and troubleshooting tips.
Frequently Asked Questions
How many HTTP status codes are there?
There are over 60 standard HTTP status codes registered with IANA, ranging from 100 Continue to 511 Network Authentication Required. This tool includes all official codes with detailed descriptions.
What is the most common HTTP error?
The most common client error is 404 Not Found, indicating the requested resource does not exist. The most common server error is 500 Internal Server Error, a generic server-side failure. 403 Forbidden and 401 Unauthorized are also very common.
What do the different categories mean?
1xx codes are informational (request received). 2xx codes indicate success (request accepted). 3xx codes mean redirection (further action needed). 4xx codes are client errors (bad request). 5xx codes are server errors (server failed to fulfill request).
Can I look up codes by their numeric value?
Yes. Simply type the code number (e.g., "301") in the search bar to find it instantly. You can also search by name, description, or partial matches.
Is this tool up to date?
Yes. The status code database is regularly updated to include new codes registered by IANA, as well as widely used unofficial codes like 418 I’m a Teapot and 429 Too Many Requests.
Last updated: 17 Aug 2026
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