HTTP Header Parser

Summary

Paste raw HTTP request or response headers and get a structured, labeled table with explanations, plus a one-click copy as JSON.

How it works

1. Paste raw headers into the text box, one per line, in "Name: Value" format.
2. The first line is read as a request line (METHOD /path HTTP/1.1) or a status line (HTTP/1.1 200 OK).
3. Every following line is split on the first colon into a header name and value.
4. Known headers get a short explanation pulled from a built-in reference table.
5. Click "Copy as JSON" to copy the parsed headers as a JSON object to your clipboard.

Use cases

• Turn headers copied from browser dev tools into a readable table.
• Check what a Cache-Control or Content-Security-Policy value actually means.
• Convert a pasted response into JSON for a bug report or documentation.
• Spot duplicate or malformed header lines before debugging further.
• Review CORS-related headers (Access-Control-*) at a glance.
• Inspect Set-Cookie attributes without counting commas and semicolons by hand.

Frequently Asked Questions