API & HTTP Debugging Tools
Debug APIs, clean content, format data, and run release checks directly in your browser.
A focused set of tools for HTTP debugging: convert raw headers to JSON, look up status code meanings, switch between cURL, Fetch, and HTTPie syntax, and decode Set-Cookie, Cache-Control, and CORS response headers field by field.
Filter by Focus
HTTP Status Codes
Reference for all HTTP status codes
API & HTTP
MIME Type List & Content-Type Reference
Find MIME types by extension (png, jpg, mp3, pdf, json) with copy-ready output
API & HTTP
cURL to Fetch
Convert cURL commands to JavaScript fetch
API & HTTP
User-Agent Parser
Parse browser, OS, device from UA string
API & HTTP
HTTP Headers Parser (Raw Header to JSON)
Parse raw HTTP request/response headers into structured JSON
API & HTTP
HTTP Header Generator
Generate HTTP request header blocks
API & HTTP
Email Header Parser
Parse raw email headers into structured fields
API & HTTP
HTTPie to cURL Converter
Convert HTTPie commands to cURL
API & HTTP
HTTP Request Builder
Build cURL and fetch requests from structured inputs
API & HTTP
Content-Type Parser (MIME, Charset, Boundary)
Parse Content-Type headers and extract MIME parameters
API & HTTP
Content-Type Generator (MIME Header Builder)
Generate valid Content-Type headers with charset and boundary
API & HTTP
Data URL Parser
Parse data: URLs and preview decoded payload content
API & HTTP
Set-Cookie Parser
Parse Set-Cookie headers into name, value, flags, and attributes
API & HTTP
Cache-Control Parser
Parse Cache-Control directives and inspect TTL and conflicts
API & HTTP
CORS Header Generator
Generate Access-Control-* headers for API and preflight responses
API & HTTP