ReactNext.jsReactTypeScript
The Complete Next.js App Router Guide
Everything you need to know about Next.js App Router — layouts, loading states, error boundaries, and more.
Apr 10, 202615 min read21,000 views2300 words
File-Based Routing
App Router uses the filesystem as your router.
JS
| 1 | app/ |
| 2 | layout.tsx # Root layout |
| 3 | page.tsx # Home page |
| 4 | blog/ |
| 5 | layout.tsx # Blog layout |
| 6 | page.tsx # Blog index |
| 7 | [slug]/ |
| 8 | page.tsx # Individual post |
| 9 | api/ |
| 10 | posts/ |
| 11 | route.ts # API endpoint |
Parallel Routes
Render multiple pages in the same layout simultaneously.