🛡️Content Security Policy (CSP) Generator Documentation & Guide
Web & Developer
Build and validate strict, injection-proof Content Security Policy (CSP Level 3) header rules visually. Mitigate Cross-Site Scripting (XSS), clickjacking, and data exfiltration attacks across modern web applications.
📋How to Build a Content Security Policy
- Choose Deployment Format: Select between raw HTTP response header, HTML tag, Nginx add_header, or Apache .htaccess format.
- Configure Fallback Policy: Set default-src to 'self' or 'none' as the baseline defense-in-depth restriction.
- Whitelist Trusted Origins: Specify approved domains for script-src, style-src, img-src, connect-src, and web fonts.
- Generate & Copy: Click 🛡️ Build CSP Header to inspect and copy your validated policy directive.
⚙️Technical & Security Architecture Details
Content Security Policy acts as a client-side firewall enforced by modern web browsers:
• default-src Fallback: Acts as the parent directive for any omitted specific fetch directives (script-src, style-src, font-src, connect-src). Setting 'none' delivers maximum zero-trust security.
• frame-ancestors vs X-Frame-Options: Modern CSP Level 3 frame-ancestors supersedes legacy X-Frame-Options headers for granular iframe clickjacking prevention.
• upgrade-insecure-requests: Automatically rewrites all insecure HTTP asset requests (images, scripts, styles) to encrypted HTTPS before network dispatch.
💡Practical Use Cases & Best Practices
- XSS Defense: Forbid inline script execution ('unsafe-inline') and eval() to neutralize reflected and stored Cross-Site Scripting vulnerabilities.
- Third-Party Vendor Control: Explicitly whitelist allowed third-party analytics and CDN origins while blocking unapproved data exfiltration endpoints.
- CSP Report-Only Mode: Deploy Content-Security-Policy-Report-Only during staging audits to monitor policy violations without breaking live production features.
100% Client-Side Privacy Guarantee:All CSP policies are generated and formatted 100% locally within your client browser. Zero security configurations are sent across any network.
