Mastering the App Router
Parallel Routes
Render multiple pages in the same layout simultaneously — perfect for dashboards.
Server Actions with Optimistic UI
Combine Server Actions with useOptimistic for instant feedback.
Route Groups
Use (name) groups to organize without affecting URLs.
Data Fetching Patterns
- Sequential: When B depends on A
- Parallel:
Promise.all()for independent data
Caching Strategies
fetch()cached by default in Server ComponentsrevalidatePath()for on-demand revalidationunstable_cache()for database queries
The App Router is a complete application architecture.
Originally published on IceCat Studio Blog.