Developer · 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
Search common HTTP status codes
API & HTTP
MIME Type List & Content-Type Reference
Look up reference MIME values by extension or media type
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 Headers to JSON)
Inspect request or response text while preserving repeated header fields and their order
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 a supported HTTPie command into a POSIX cURL snippet
API & HTTP
HTTP Request Builder
Build cURL and browser-compatible Fetch snippets from request fields
API & HTTP
Content-Type Parser (MIME, Charset, Boundary)
Parse Content-Type headers and extract MIME parameters
API & HTTP
Content-Type Generator (MIME Header Builder)
Build Content-Type values with optional charset and quoted parameters
API & HTTP
Data URL Parser
Inspect a data: declaration, decoded byte count, and UTF-8 text preview
API & HTTP
Set-Cookie Parser
Inspect response cookie pairs, ordered attributes, empty values and syntax diagnostics
API & HTTP
Cache-Control Parser
Parse cache directives and compare browser and shared-cache freshness
API & HTTP
CORS Header Generator
Generate static CORS response headers and check supplied preflight parameters
API & HTTP
HAR File Viewer and Analyzer
Inspect HAR requests, separate body/content sizes and supported cURL snippets
API & HTTP
GraphQL Formatter
Parse, format, or minify GraphQL operations and summarize variables and fragments
API & HTTP
Cookie Header Parser
Read ordered request-cookie pairs, preserve duplicates and optionally decode percent escapes
API & HTTP
Content-Disposition Parser & Generator
Inspect ordered filename parameters or generate an ASCII fallback with UTF-8 filename*
API & HTTP