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HTTP Header Parser - Parse Request & Response Headers Online

Parse and format raw HTTP header strings into structured key-value tables and JSON with security and caching diagnostics.

This tool runs in your browser.

Processed locally in your browser.

How to use

  1. 01Enter or upload the source data.
  2. 02Run the tool in your browser.
  3. 03Review, copy, or download the result.

FAQ

What critical server policies can be audited via HTTP headers?

Headers reveal caching directives (Cache-Control, ETag), CORS allowances (Access-Control-Allow-Origin), and security protections (CSP, HSTS).

Does the parser accept both request and response header text?

Yes. Any standard RFC 7230 header text is recognized and parsed into separated status lines and key-value attributes.

Are sensitive tokens or headers safe during parsing?

Yes. All parsing executes purely within your browser memory without submitting credentials over external networks.