MoT
🛡️
Security & Privacy100% Client-Side0 Bytes Uploaded

CSP Evaluator & Security Validator

Evaluate, audit, and validate Content Security Policy (CSP Level 3) headers in real time. Detect XSS bypasses, wildcard origins, unsafe-eval/unsafe-inline risks, and missing fallback directives.

🖥️Open in Workspace
🛡️
Loading CSP Evaluator & Security Validator...
Ultra-low latency client-side execution

🛡️CSP Evaluator & Security Validator Documentation & Guide

Security & Privacy

📋How to Use CSP Evaluator & Security Validator

  1. Paste Policy or Meta Tag: Enter your raw Content-Security-Policy HTTP header string or HTML tag into the editor.
  2. Live AST & Threat Parsing: The engine tokenizes directives and checks against W3C Level 3 security rules, evaluating bypass risks for 'unsafe-inline', 'unsafe-eval', wildcards, and missing fallbacks.
  3. Review Grade & Hardened Output: Inspect the calculated security letter grade (A+ to F), review granular findings, and copy the auto-generated hardened policy recommendation.

⚙️Content Security Policy (CSP Level 3) Execution Architecture

CSP Level 3 is a declarative browser defense mechanism designed to restrict the resources (JavaScript, CSS, Images, Frames) that a browser is permitted to load:

• Defense in Depth: Neutralizes XSS attacks even if an attacker manages to inject arbitrary markup into the DOM.
• Strict Nonces & Hashes: Cryptographic nonces ('nonce-...') allow inline scripts while blocking attacker-injected snippets.
• strict-dynamic Delegation: Automatically trusts scripts loaded by an already-approved root script, simplifying modern bundler integration.
• Object & Base Locking: Setting object-src 'none' blocks Flash/applet injection, while base-uri 'none' prevents document base hijacking.
• 100% Client-Side Audit: Header evaluation runs locally using deterministic AST analysis with zero remote telemetry.

Deploying a rigorous CSP 3 header eliminates the root cause of DOM and reflected Cross-Site Scripting vulnerabilities.

💡Practical CSP Evaluation Use Cases

  • Auditing production HTTP headers before deploying web applications to identify inadvertent XSS bypasses.
  • Migrating legacy CSP policies reliant on 'unsafe-inline' to modern nonce-based Level 3 architectures.
  • Verifying that third-party analytics and tracking scripts do not widen your origin attack surface.
100% Client-Side Privacy Guarantee:All calculations, text manipulation, cryptographic hashing, and media conversions execute exclusively within your local browser sandbox. Zero user inputs, financial amounts, credentials, or proprietary files are ever transmitted across networks or logged on external servers.
✨