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HTTP Header Parser

Parse raw HTTP headers into structured JSON.

Use the tool

Use HTTP Header Parser to turn raw request or response headers into structured fields you can review during debugging.

Dev Workbench

HTTP Header Parser

Parse raw HTTP headers into structured JSON.

Input

Parsed Headers

Run the tool to see output.
Lines: 0Chars: 0

Why use HTTP Header Parser

  • Parse headers copied from browser DevTools, curl, Postman, proxies, or logs.
  • Inspect Cache-Control, ETag, Vary, CORS, cookies, content type, and security headers.
  • Share a readable header breakdown in support, QA, performance, or security tickets.
  • Compare headers before and after a CDN, proxy, deploy, or API gateway change.

About this tool

HTTP header parsing for debugging

HTTP Header Parser separates raw header text into readable name and value pairs so teams can inspect how clients, servers, CDNs, and APIs are communicating.

Caching, CORS, and security checks

Headers often explain stale content, blocked browser requests, wrong content types, missing cookies, redirects, and weak security policy. Parsing makes those signals easier to review.

Preserve exact values

When debugging headers, keep original casing, duplicate fields, commas, directives, and ordering in mind. Some behavior depends on exact values and how the client interprets them.

Example usage

Input

HTTP/2 200\ncontent-type: text/html\ncache-control: max-age=3600

Output

Status: 200\ncontent-type: text/html\ncache-control: max-age=3600

Practical guide for HTTP Header Parser

Best practices

  • Mask cookies, bearer tokens, and private IDs before sharing parsed headers.
  • Compare origin and CDN headers when debugging stale content.
  • Check CORS and security headers in the browser context where the issue appears.

Common mistakes

  • Ignoring duplicate headers or comma-separated directives.
  • Assuming DevTools and curl show identical request behavior.
  • Sharing sensitive auth or cookie headers in public tickets.

How this tool works

  1. Step 1

    Open HTTP Header Parser and review the default example input.

  2. Step 2

    Paste your own input or upload source data when required.

  3. Step 3

    Run HTTP Header Parser to generate output instantly in the browser.

  4. Step 4

    Verify the output using the preview and formatting helpers on the page.

  5. Step 5

    Copy the final result and continue with a related tool if needed.

Use related links to continue your workflow and keep your output consistent across ToolHarbor pages.

JSON FormatterFormat JSON with readable indentation.JSON MinifierMinify JSON by removing extra whitespace.Query String ParserParse query strings into JSON key-value data.URL ParserParse a URL into protocol, host, path, and params.User Agent ParserParse user-agent strings into readable device data.

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FAQ

Where can I copy raw HTTP headers from?

Common sources include browser DevTools, curl -I output, Postman, API logs, reverse proxies, CDN dashboards, and network captures.

What header problems can this reveal?

It can help spot caching directives, CORS settings, content types, redirects, cookies, auth headers, and security policy fields.

Can duplicate headers matter?

Yes. Some headers can appear multiple times, and clients may combine or interpret them differently depending on the specification.

Should I paste authorization headers?

Avoid pasting real secrets, cookies, bearer tokens, session IDs, or private request IDs into shared screenshots or tickets.