HTTP Headers & Security Auditor
Parse HTTP headers, audit critical security headers (HSTS, CSP, X-Frame-Options, CORS), and calculate a security grade.
Batch workspace
Format multiple files locally in one run.
How to use the HTTP Headers & Security Inspector
Paste code or file
Paste your raw TEXT text or upload directly.
Configure options
Choose indentation, dialect, or formatting preferences.
Format & export
Click format, then copy, download, or inspect in tree view.
What is a HTTP Headers & Security Inspector?
Parse HTTP headers, audit critical security headers (HSTS, CSP, X-Frame-Options, CORS), and calculate a security grade. This tool re-indents and organizes code according to standard style conventions while checking for syntax validity. Everything executes 100% inside your browser, guaranteeing zero latency and complete privacy for API keys, user tokens, and confidential database schemas.
Frequently Asked Questions
What security headers does this tool audit?
It checks Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Frame-Options (Clickjacking defense), X-Content-Type-Options (nosniff), Referrer-Policy, Permissions-Policy, and CORS wildcard configurations.
How can I copy headers from my browser DevTools?
Open DevTools (F12) → Network tab → Click any request → In the 'Headers' panel, copy 'Response Headers' and paste here.
Is my data uploaded when I use the HTTP Headers & Security Inspector?
No. All processing runs entirely in your browser. Nothing is sent to a server unless you explicitly create a share link.
Does this tool work offline?
Yes. After the first visit, the PWA service worker can serve the page and run the formatter without a network connection.
What is the maximum input size?
Most tools accept up to about 5MB in the editor. Very large inputs are processed preferentially in a Web Worker and may download instead of filling the output pane.
Free Developer Cheat Sheet
Download a handy, printable reference guide for HTTP Headers & Security Inspector syntax and best practices.
Download Free Cheat Sheet