HTTP Toolkit
cURL to fetch, status codes, headers, content types, and MIME lookup.
HTTP debugging and client translation utilities
HTTP integrations fail in predictable places: wrong verb, malformed headers, unexpected status families, or MIME types that do not match the response body. A toolkit hub groups cURL translation, status references, and header inspection so you can move from browser network tabs to reproducible code quickly.
Translating cURL to fetch or another client runtime removes guesswork about cookie jars, compressed responses, and header casing. Always re-check authentication headers and body serialization after conversion because runtimes differ in default JSON handling.
Status code and content-type lookups help when logs only print numeric codes or abbreviated MIME strings. They are especially useful during on-call when you are correlating gateway errors with upstream application responses.
Use these utilities beside your API client when reproducing partner bugs. Local translation keeps bearer tokens and session cookies out of public paste bins while you iterate on a minimal failing request.
Reference Guide
HTTP helpers for cURL translation, status codes, headers, and MIME lookup during API debugging.
| Task | Tip |
|---|---|
| cURL to fetch | Re-check auth headers and JSON body serialization |
| Status codes | 4xx is client error, 5xx is server error |
| Content-Type | Charset suffix affects parser choice |
Current mode
Operation: curl-to-fetch
All processing runs locally in your browser. Paste input, click Run, and copy the result.
Example Input
curl -X POST https://api.example.com/v1/items -H 'Content-Type: application/json'
A sample loads automatically when you open this tool. Use Load Sample to reset it.