AVAILABLE FOR WEB, FLUTTER & QA PROJECTS
How to use this tool
1. Select Security Profile
Pick Strict Nonce-Based, Balanced SaaS, or Permissive Starter policy.
2. Configure Core Directives
Customize default-src, script-src, style-src, img-src, connect-src, and frame-ancestors.
3. Whitelist Trusted Services
Toggle common providers like Google Analytics, Stripe, Google Fonts, and Vercel.
4. Export Header Syntax
Copy HTTP header string, Next.js middleware code, or HTML <meta> tag.
Formula or logic used
CSP Policy Structure & Directive Grammar
Constructs granular resource origin rules enforcing browser execution boundaries and blocking unauthorized code injection.
default-src 'self' defines fallback permissions for all unspecified resource typesscript-src 'self' 'nonce-{RANDOM}' 'strict-dynamic' prevents malicious inline script executionframe-ancestors 'none' blocks unauthorized embedding in iframes, preventing clickjacking attacksconnect-src restricts destinations for fetch(), XMLHttpRequest, and WebSocket connections
Examples
Example 1: Modern Next.js App Router Policy
Safeguards user authentication and payment data while permitting necessary third-party checkout scripts.
Example 2: High-Security Enterprise Banking Policy
Maximum OWASP-compliant lockdown blocking all unauthorized inline scripts and domain spoofing.
Common use cases
XSS Vulnerability Mitigation
Neutralize stored and reflected Cross-Site Scripting attacks even if unescaped user input reaches the DOM.
PCI-DSS Compliance Audits
Fulfill PCI-DSS 4.0 requirements regarding script integrity on payment checkout pages.
Clickjacking Defense
Prevent malicious actors from embedding your application inside transparent iframe overlays.
Next.js Security Header Integration
Generate dynamic nonce headers in Next.js middleware for zero-trust script execution.
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Frequently asked questions
What is the difference between CSP and CSP-Report-Only?
Content-Security-Policy enforces the rules and blocks any violating resource from executing. Content-Security-Policy-Report-Only allows violating resources to run normally, but reports each violation to a reporting endpoint, allowing safe testing in production.
Why should I avoid 'unsafe-inline' and 'unsafe-eval'?
'unsafe-inline' allows any inline <script> tag to run, effectively disabling CSP's primary defense against Cross-Site Scripting (XSS). 'unsafe-eval' allows strings to be converted into executable code via eval(), opening dangerous code injection pathways.
How does strict-dynamic work in CSP Level 3?
'strict-dynamic' allows a script that was loaded with a valid cryptographic nonce to load additional downstream scripts without needing to whitelist every transitive domain.
Can CSP be declared inside an HTML <meta> tag?
Yes, via <meta http-equiv='Content-Security-Policy' content='...'>. However, frame-ancestors, report-uri, and sandbox directives are ignored when delivered through meta tags; they require true HTTP headers.
Let's build something
exceptional together
Work directly with Faisal Rafique to architect and deliver high-performance Next.js 15 platforms, 60fps Flutter mobile applications, and enterprise automated QA testing pipelines.