HTTP headers parser
About HTTP Headers Parser
The HTTP headers parser converts a copied request or response header block into JSON. Repeated fields stay separate and empty values are kept.
How it works
Request and status lines
An HTTP status line becomes response metadata. A method, request target and HTTP version become request metadata. Blocks with only headers work too.
Repeated fields kept apart
Duplicate names are matched without regard to case and collected into arrays, not joined. This matters for fields such as Set-Cookie, which break if you join them with commas.
Malformed input
Invalid field names and lines without a colon are reported with their line number. Obsolete folded continuation lines are unfolded and counted.
Frequently asked questions
Are HTTP header names case-sensitive?
No. Duplicates are always matched without regard to case. Output names can be lowercased or keep the first spelling seen.
Does this split comma-separated header values?
No. Comma rules differ by field, so each header line stays one value. Only repeated lines become arrays.
Does the parser send a request?
No. It only parses the text you paste and makes no network calls.
Learn more
Sources & last verified
We checked this tool's behavior and the claims on this page against the specifications below on . The tool runs in your browser, so the output you see is exactly what the engine produced. How we build and verify tools.
Last verified · Next review due
Found a wrong result or an outdated claim? Report an error and we will check it again.
MIME Type Lookup
Unicode & Encoding Inspector
JSONPath Tester
JSON Path Finder
jq Tester
Regex Tester