Next.js App Router: Advanced Patterns

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 Components
• revalidatePath() for on-demand revalidation
• unstable_cache() for database queries

The App Router is a complete application architecture.

Originally published on IceCat Studio Blog.