nextjs-supabase-auth

To implement Supabase authentication in Next.js App Router, use separate browser, server, and middleware clients for correct cookie handling and token propagation. Validate sessions server-side via getUser and apply protected layouts to enforce access control.

The best way to refresh Supabase auth tokens in Next.js middleware is using a centralized middleware flow. This approach refreshes tokens automatically and redirects unauthenticated users to login or authenticated users away from login pages.

Handle OAuth and magic link callbacks with Supabase by implementing specific callback route patterns in your Next.js App Router project. These patterns manage authentication redirects and establish secure server-side sessions.

Yes, you need separate browser, server, and middleware Supabase clients in Next.js SSR. Distinct clients ensure correct cookie handling and token propagation across client components, server components, and middleware.

Use server actions for Supabase auth mutations to handle sign in, sign up, and password reset securely. This pattern avoids exposing sensitive authentication flows to the client by executing mutations server-side.

Validate Supabase sessions server-side to prevent spoofed sessions and enforce role-based access control combined with Row Level Security. Client-only checks risk exposing authentication state to manipulation and bypass.