Security in Modern Web
With data breaches becoming more common, security cannot be an afterthought. Next.js provides many built-in protections, but you must know how to use them.
1. Server Actions and Authentication
Always validate authorization inside your Server Actions. Don't rely on client-side checks which can be bypassed easily.
2. Environment Variables
Never expose sensitive API keys in prefix-less environment variables. Keep secret keys server-side using .env.local.
3. Content Security Policy (CSP)
Implement a strict CSP to prevent Cross-Site Scripting (XSS) and data injection attacks.