Security is not an afterthought—especially for corporate and enterprise websites carrying user details and internal dashboards. Next.js provides excellent security defaults, but there are several critical steps developers must take.
1. Cross-Site Scripting (XSS) Protection
Always sanitize user-submitted HTML if you must render it using 'dangerouslySetInnerHTML'. Standard React bindings protect from simple script injection, but dynamic data requires libraries like DOMPurify.
2. Guarding APIs (Rate Limiting)
Public-facing forms (like contact forms or support systems) must be rate-limited. Implementing a simple token bucket middleware or using services like Redis protects routes from Denial of Service (DoS) and spam bots.
3. Database Sanitization
When using Prisma, most queries are automatically parameterized, protecting from SQL injection. However, avoid raw queries ('prisma.$queryRaw') unless you strictly bind parameters.
4. CSRF Tokens
Ensure your NextAuth setup uses host-checked cookies, secure cookies, and correct CORS policies to verify originating client identity.
