Bulletproof React: Strict Content Security Policies in Next.js 🛡️

Short summary

Next.js Strict Content Security Policy (CSP) with cryptographic nonces prevents XSS attacks by blocking injected scripts at the browser level. Implement in Edge Middleware to generate unique nonces per request and pass them to React components. This architectural defense eliminates entire vulnerability classes even if developers introduce flaws.

• •Generate cryptographic nonces in Next.js middleware and attach to CSP headers on every request
• •Pass nonces to React components and third-party scripts so only authorized code executes
• •Blocks injected XSS at the browser level, providing defense-in-depth against compromised dependencies

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