Web Security & Transitions
25. Security: Strict CSP, Nonces & View Transitions
Harden web applications against XSS with cryptographic CSP nonces, strict headers, and coordinate fluid page animations with View Transitions.
csp-transitions.ts
// Strict CSP Nonce Generator & View Transitions Integration
import crypto from 'node:crypto';
export function createSecurityHeaders() {
const nonce = crypto.randomBytes(16).toString('base64');
const csp = [
"default-src 'self'",
`script-src 'self' 'nonce-${nonce}' 'strict-dynamic'`,
"style-src 'self' 'unsafe-inline'",
"img-src 'self' data: https:",
"font-src 'self'",
"object-src 'none'",
"base-uri 'self'",
"frame-ancestors 'none'"
].join('; ');
return { nonce, headers: { 'Content-Security-Policy': csp, 'X-Frame-Options': 'DENY' } };
}Security: Strict CSP, Nonces & View Transitions
Securing web applications against Cross-Site Scripting (XSS) and clickjacking with strict Content Security Policies while providing fluid navigational animations with the View Transitions API.
- Cryptographic CSP Nonces: Server-generated nonces ensure that only vetted scripts executed by the framework can run, blocking malicious injected payloads.
- Clickjacking Mitigation (
frame-ancestors 'none'): Prevents unauthorized embedding inside foreign iframes. - View Transitions API: Natively morphs DOM elements between pages and route navigations without complex layout calculations.
Strict CSP Header Policy Generator XSS Mitigation
Generated Content-Security-Policy Header:
default-src 'self'; script-src 'self' 'nonce-rAnd0mN0nc3Str1ng==' 'strict-dynamic'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; object-src 'none'; base-uri 'self'; frame-ancestors 'none'
Native View Transitions API Morphing document.startViewTransition
Morphable Element
Compact View