HTTP Headers Formatter

Parse raw HTTP headers into a readable table or JSON instantly — free HTTP header parser.

About

About the HTTP Headers Formatter

Parses a raw block of "Key: Value" HTTP header lines into a readable table or a JSON object.

Developers use it to quickly make sense of a wall of raw response headers, while API integrators use the JSON output to drop the same headers straight into a config or a test script. It's one of many free developer tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

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Guide

Using the HTTP Headers Formatter

  1. 1

    Step 1

    Paste your raw headers, one per line, as "Key: Value".

  2. 2

    Step 2

    Click "Parse" to see them laid out in a table.

  3. 3

    Step 3

    Click "Copy as JSON" to copy the same headers as a JSON object.

  4. 4

    Step 4

    Clear to start over with a different block of headers.

  • Parses any number of "Key: Value" header lines into a clean table
  • Also gives you the same headers as a ready-to-copy JSON object
  • Ignores lines that aren't in "Key: Value" form instead of failing
  • Runs entirely in your browser — your headers are never uploaded anywhere
  • Free to use, with no limit on how many times you run it
  • Fully responsive, so it works just as well on a phone as on a desktop

Developers

Developers use the HTTP Headers Formatter for quickly making sense of a wall of raw response headers copied from a browser's network tab.

API integrators

API integrators use the HTTP Headers Formatter for turning a raw header dump into JSON to drop straight into a test script or request config.

Support and QA engineers

Support and QA engineers use the HTTP Headers Formatter for reading through the headers in a bug report or a curl -v output at a glance.

Students learning HTTP

Students learning HTTP use the HTTP Headers Formatter for seeing a raw header block laid out clearly, one field at a time.

Examples

HTTP Headers Formatter examples

3 worked examples

01

Typical response headers

Paste "Content-Type: application/json" and "Cache-Control: no-cache" and click Parse to see both headers laid out as a table, with the same 2 headers also available as JSON.

02

Copy as JSON

Paste "Authorization: Bearer abc123" and click Copy as JSON to get {"Authorization": "Bearer abc123"}, ready to paste into a script or config file.

03

A line with no colon

Paste "GET /path HTTP/1.1" among your header lines and it's silently skipped, since only valid "Key: Value" lines are parsed as headers.

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FAQ

Frequently asked questions

Quick answers to common questions about the HTTP Headers Formatter.

What does the HTTP Headers Formatter do?

It parses a raw block of "Key: Value" HTTP header lines into a readable table, and can give you the same headers as a JSON object.

Is the HTTP Headers Formatter free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my data safe when I use this tool?

Yes, even if your headers include tokens or cookies — everything is parsed entirely on your own device, nothing is sent to a server.

What format do the headers need to be in?

One header per line, as "Key: Value" — the same format you'd see in a browser's network tab or a curl -v response.

What happens to lines that aren't valid headers?

Lines without a colon separating a key from a value are skipped, so stray blank lines or a request line at the top won't break the parse.

Can I go from JSON back to raw headers?

Not directly — this tool parses raw header lines into a table and JSON; it doesn't currently convert a JSON object back into "Key: Value" lines.

Can I use the HTTP Headers Formatter on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

Does the HTTP Headers Formatter have any limitations?

It treats every header as a simple string value; it doesn't further parse structured header values like cookies or cache-control directives into their own sub-fields.

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