DevUtilsNow
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Web & HTTP

HTTP Headers Parser

Parse raw HTTP request or response headers into clean JSON.

No upload, ever No account needed Works offline
Input (Paste raw headers)
0 characters
Output
Auto-updated
// how to use it

Three steps, no reading required.

Paste your input

Drop text, code, or data into the input pane — from an API response, a file, anywhere.

See it process

The result updates instantly as you type.

Copy the result

Grab the output with Copy or Download, or fix the error shown if the input is invalid.

// examples

Try it with a sample.

Response
HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-cache
Set-Cookie: a=1
Set-Cookie: b=2
TYPICAL ONLINE TOOL

Raw headers pasted into a server

  • Headers can carry cookies and tokens
  • Drops the request or status line
  • Overwrites repeated headers
DEVUTILSNOW

Headers to clean JSON

  • Request or status line kept under _startLine
  • Repeated headers like Set-Cookie collapse into an array in order
  • Parsed locally in your tab
// faq

Questions worth answering upfront.

No. Parsing runs entirely in your browser. Your headers — which may contain tokens or cookies — never leave your device.

Yes. A request line (GET /path HTTP/1.1) or status line (HTTP/1.1 200 OK), if present, is kept under the _startLine key, and the rest are parsed as headers.

Repeated headers with the same name, like Set-Cookie, are collapsed into a JSON array in the order they appeared.

Yes. Every tool on DevUtilsNow is free to use with no account required.

No. Browsers block reading most response headers from other sites, and fetching them for you would mean routing your request through a server. Copy the headers from your browser's DevTools Network tab, or run curl -I https://example.com, and paste them here.

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// reference

Look it up

REFERENCE

HTTP headers reference

Request, response, caching, CORS and security headers

REFERENCE

Content-Type

Media types, charset and boundary

REFERENCE

Cache-Control

Directives for browsers and CDNs

// related guides

Guides that pair with this tool

All guides →
Aug 28, 2026 · 2 min read Anatomy of an HTTP Request and Response A line-by-line breakdown of an HTTP request and response — the request line, status line, headers, and body — so raw HTTP stops looking like noise. HTTP Headers Parser Aug 11, 2026 · 1 min read How to Read and Parse HTTP Headers The anatomy of HTTP request and response headers, how to turn raw headers into JSON, and why duplicates become arrays. HTTP Headers Parser
// reference

Handy reference

All references →
REFERENCE

HTTP Headers Reference

The HTTP request, response, caching, CORS and security headers you meet every day — what each one means, with a real-world example.

REFERENCE

HTTP Status Codes

Every common HTTP status code from 1xx to 5xx, with its name and what it means — grouped by category.

REFERENCE

MIME Types Reference

Common MIME (media) types by category — text, application, image, audio, video and fonts — with the file extension each maps to.

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Last updated: Oct 10, 2026