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.
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
- Paste your raw HTTP headers (copied from browser DevTools or curl) into the input.
- Headers are parsed into a structured table.
- See explanations and any flagged issues.
- 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
- Common security and cache headers are labeled with short notes.
- Very large input can be slower on older devices.
- This utility is designed for common snippets and local inspection, not as a full security or language-specific validator.
Related tools
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 toolURL Parser
Parse any URL into its components: protocol, host, port, path, query parameters, and hash fragment, instantly in your browser.
Use toolLog Prettifier
Prettify JSON log output from Node.js, Python, or any structured logging framework. Colorised, formatted, and readable, browser-only.
Use toolJSON 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 toolJSON 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 toolJSON 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 toolFrequently asked
Does it make any HTTP requests?
No. It only parses header text you paste in. No outbound requests are made.
Does HTTP Header Parser upload my input?
Your file or text is processed in your browser and is not uploaded.
What does HTTP Header Parser output?
It outputs a header table. Common security and cache headers are labeled with short notes.
Should I review HTTP Header Parser output before using it?
Yes. Developer formats and snippets can be context-sensitive, so review generated output before using it in production.