nextjs-16

App Router File Conventions

app/
├── layout.tsx           # Root layout (required)
├── page.tsx             # Home page (/)
├── loading.tsx          # Loading UI (Suspense)
├── error.tsx            # Error boundary
├── not-found.tsx        # 404 page
├── (auth)/              # Route group (no URL impact)
│   ├── login/page.tsx   # /login
│   └── signup/page.tsx  # /signup
├── api/
│   └── route.ts         # API handler
└── _components/         # Private folder (not routed)

Next.js 16 Notes