Developer Tools

HTTP Header Parser

Paste raw HTTP request or response headers and get a structured breakdown of each header, name, value, and a brief explanation of what the header does. Identifies security headers, caching directives, and content negotiation.

Runs in your browser No data sent to servers Copy or download result
text HTTP headers (raw)
Runs in your browser; code never leaves your device

Features

  • Parses raw HTTP header blocks into structured table
  • Identifies and explains common headers (Content-Type, Cache-Control, etc.)
  • Flags missing security headers (CSP, HSTS, X-Frame-Options)
  • Supports both request and response header formats
  • Copy or download header table as CSV
  • Browser-only

How to use it

  1. Paste your raw HTTP headers (copied from browser DevTools or curl) into the input.
  2. Headers are parsed into a structured table.
  3. See explanations and any flagged issues.
  4. Copy or download the structured output.

Use cases

  • Debugging API response headers
  • Auditing security headers before deploying
  • Understanding caching directives from CDN responses
  • Documenting API headers for developer reference

Limitations

  • Requires headers in standard HTTP/1.1 colon-separated format. HPACK-compressed HTTP/2 binary headers cannot be pasted directly.
See also

Related tools

Dev Browser

cURL Formatter

Format multi-line cURL commands into readable indented syntax. Paste a long cURL command and get a clean, copy-ready version. Browser-only.

Use tool
Dev Browser

URL Parser

Parse any URL into its components: protocol, host, port, path, query parameters, and hash fragment, instantly in your browser.

Use tool
Dev Browser

Log Prettifier

Prettify JSON log output from Node.js, Python, or any structured logging framework. Colorised, formatted, and readable, browser-only.

Use tool
Dev Browser

JSON Formatter

Format and beautify JSON online. Paste minified or messy JSON and get clean, 2-space indented output with syntax validation, instant, in-browser, no upload.

Use tool
Dev Browser

JSON Validator

Validate JSON syntax online with exact error messages. Get line number, column, and a human-readable explanation for every JSON error, processed in your browser.

Use tool
Dev Browser

JSON Minifier

Minify JSON by removing all whitespace and line breaks. Paste pretty JSON, get compact JSON for APIs, payloads, and config files. Browser-only, free.

Use tool
Questions & answers

Frequently asked

Does it make any HTTP requests?

No. It only parses header text you paste in. No outbound requests are made.