Securing API Routes in Next.js: Auth, Authorization & Mistakes
Diagram showing authentication and authorization checks along a Next.js API request flow Securing API Routes in Next.js: Authentication, Authorization and Common Security Mistakes Authenticating a user is only half the job. The other half — making sure every API route, Route Handler, and Server Action actually checks who's asking and what they're allowed to do — is where most real-world security bugs live. This article covers how to secure the server-side surface of a Next.js app once your authentication layer is in place. API Authentication: Confirming Who's Calling Every Route Handler and Server Action that touches non-public data should independently verify the caller's identity — not assume that because a request reached the handler, it must be authenticated. // app/api/orders/route.ts import { auth } from '@/auth' // or your provider's server-side session reader export async function GET(request: Request) { const session = await auth...