Content Security Policy (CSP) Generator
Build hardened Content Security Policy headers for Nginx, Next.js, and Apache with instant security audit scoring.
1. Quick Security Profile Presets
CSP Directives Configuration
Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' https://www.google-analytics.com https://www.googletagmanager.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data: https:; font-src 'self' data: https://fonts.gstatic.com; connect-src 'self' https:; frame-src 'self'; frame-ancestors 'none'; object-src 'none'; base-uri 'self'; upgrade-insecure-requests;
Defending Modern Web Applications with CSP
Even with modern frontend frameworks that automatically escape HTML, supply-chain attacks via compromised NPM packages or malicious third-party tracking scripts can hijack user sessions and exfiltrate credentials. A well-constructed Content Security Policy acts as a cryptographic firewall inside the user's browser.
Implementation Scenarios
- ✓Cross-Site Scripting (XSS) Defenses
Neutralize stored and reflected XSS attacks by restricting JavaScript execution solely to trusted origins or cryptographic nonces.
- ✓Anti-Clickjacking & Frame Ancestors
Replace deprecated X-Frame-Options with modern `frame-ancestors 'none'` to guarantee your web application cannot be embedded inside malicious IFrames.
- ✓Google Analytics & Tag Manager Integration
Whitelist Google Tag Manager (GTM), GA4, and Google AdSense domains without breaking site security or triggering browser console CSP errors.
- ✓Next.js & Single Page Application Hardening
Generate compliant Next.js `next.config.js` headers or NGINX server blocks with `upgrade-insecure-requests` to ensure seamless HTTPS transport.
Key Capabilities
Multi-Format Export
Instantly export your policy as an HTTP header, HTML <meta> tag, NGINX `add_header` block, Apache `.htaccess` directive, or Next.js config snippet.
Automated Security Scoring
Real-time diagnostic engine warns against dangerous directives like `unsafe-inline` or permissive `object-src` configurations.
One-Click Framework Presets
Includes production-tested profiles for strict zero-trust sites, React/Vue SPAs, and third-party analytics integrations.
CSP Level 3 Compliance
Built according to W3C Content Security Policy Level 3 recommendations, supporting `frame-ancestors`, `base-uri`, and HTTPS upgrades.
Frequently Asked Questions
What is a Content Security Policy (CSP) and why is it essential?
A Content Security Policy is an HTTP response header that lets website operators declare which dynamic resources (scripts, stylesheets, images, fonts, connections) the browser is allowed to load. It serves as the primary defense against Cross-Site Scripting (XSS) and data injection vulnerabilities.
Why should I avoid 'unsafe-inline' in script-src?
Using `'unsafe-inline'` allows scripts contained directly within HTML tags (`<script>alert(1)</script>`) or inline event handlers (`onclick=...`) to execute. Because attackers inject script tags during XSS exploits, `'unsafe-inline'` nullifies the main security advantage of CSP. Prefer nonces or external hashed scripts.
What is the difference between frame-src and frame-ancestors?
`frame-src` controls what external URLs your web page can embed inside an `<iframe>`. `frame-ancestors` controls who can embed your web page inside their `<iframe>`, replacing the older `X-Frame-Options` header to stop clickjacking.
Can I test CSP without breaking my production website?
Yes! You can deploy your policy using the `Content-Security-Policy-Report-Only` header along with a `report-uri` endpoint. The browser will report all policy violations to your endpoint without actually blocking any scripts or styles.
More Developer Tools
Need a Brain Break? ☕
Done working on your task? Take a quick 60-second break, test your reflexes, and flap through infinite pixel obstacles in Sky Flap!