HTTP Header Parser

Parses raw HTTP headers into JSON.

The HTTP Header Parser turns raw HTTP request or response headers into clean, formatted JSON. Paste headers copied from your browser's network tab, curl -v output, or a server log, and get each header name mapped to its value. It's handy when you need to inspect, compare, or feed HTTP headers into other tools as structured data.

Common uses

• Convert headers copied from the browser DevTools Network panel into JSON
• Parse the raw headers from `curl -v` or `curl -i` output
• Inspect response headers like Content-Type, Cache-Control, or Set-Cookie as key/value pairs
• Normalize pasted request headers before saving them in tests or fixtures
• Quickly check which headers a server returns while debugging an API

FAQ

Is my data sent to a server?

No. Parsing runs entirely in your browser and nothing is uploaded. The headers you paste never leave your device.

How does it handle the request or status line?

Lines without a colon, or with a colon at the very start, are skipped. So a request line like `GET / HTTP/1.1` or a status line like `HTTP/1.1 200 OK` is ignored, and only real header lines are parsed.

What is the output format?

The result is a pretty-printed JSON object (indented with two spaces) where each header name is a key and its value is the corresponding string.

What happens with duplicate header names?

Each header is stored as a single JSON key, so if the same header name appears more than once, the last occurrence overwrites the earlier ones.

Why do I get a "No headers found" error?

That error appears when no line contains a valid `Name: value` pair. Make sure each header is on its own line and includes a colon separating the name from the value.

Related tools

• Basic Auth Header
• IP ↔ Integer
• MAC Address Formatter
• Subnet Calculator
• User-Agent Parser