Next.js + NextAuth.js — SSO Security Hardening and Best Practices
Next.js + NextAuth.js — SSO Security Hardening and Best Practices This final post in the Next.js Frontend SSO series focuses on security and best practices for production-grade SSO. Even with a working authentication flow, neglecting security can lead to token leaks, session hijacking, or unauthorized access. 1️⃣ Secure session cookies NextAuth.js stores session information in cookies (JWT or database sessions). Configure cookies properly: httpOnly: prevents JavaScript access to cookies secure: ensure cookies are sent only over HTTPS SameSite: protect against CSRF (use "lax" or "strict") cookies: { sessionToken: { name: `__Secure-next-auth.session-token`, options: { httpOnly: true, sameSite: 'lax', path: '/', secure: process.env.NODE_ENV === 'production' } } } 2️⃣ Refresh token rotation Refresh tokens should be rotated to prevent replay attacks...