HTTP Header Parser
Parse and analyze HTTP headers. Displays request/response headers in readable format.
About HTTP Header Parser
Paste raw HTTP request or response headers and parse them into a clean, readable table. Each header name and value is displayed with a brief explanation of what it does. Highlights security headers (CSP, HSTS, X-Frame-Options), CORS headers, caching headers, and authentication headers. Useful for debugging API responses, analyzing server configurations, and learning about HTTP.
All processing happens entirely in your browser using modern web APIs. Nothing is uploaded to our servers — your data stays local and private. Free to use forever.
Common use cases
- Analyzing CORS headers from an API response to debug cross-origin issues
- Checking security headers (HSTS, CSP, X-Frame-Options) on a server response
- Understanding caching headers (Cache-Control, ETag, Last-Modified) from an API
- Parsing Authorization headers to understand the auth scheme being used
- Debugging webhook delivery failures by inspecting headers in logs
How it works
Splits the input on newlines. Each line is split on the first colon (": ") to separate the header name from its value. The parsed pairs are matched against a built-in dictionary of ~100 common HTTP headers to provide descriptions and documentation links. Headers are categorized by function (security, caching, CORS, content, auth, etc.).