Must-Know Security Practices for Every Full Stack Developer should know in 2025 In today's world of rapid development, ignoring security can cost more than just downtime. Whether you're building SaaS, eCommerce, or APIs — security must be baked into every layer . Here’s a power-packed checklist every Full Stack Developer should follow: Frontend Security 1. XSS Attack (Cross-Site Scripting) Never trust user input. Sanitize all dynamic content. ❌ dangerouslySetInnerHTML (React) ✅ Use v-text or auto-binding (Vue, Angular) 2. CSRF Attack (Cross-Site Request Forgery) Session cookies can betray you. ✅ Use SameSite=Strict cookies + CSRF tokens. 3. Secure Local Storage Don’t store access tokens in localStorage . ✅ Use HttpOnly cookies instead. 4. CSP Headers Prevent malicious scripts. ✅ Add Content-Security-Policy: script-src 'self' Backend Security 1. CORS Policy (Cross-Origin Resource Sharing) Only allow known origins. ✅ Acc...