app-router

Structure Next.js App Router dynamic routes and nested layouts using file conventions like page.tsx, layout.tsx, and loading.tsx. This approach defines modular routing topologies, managing complex hierarchies and shared UI across multiple route segments.

Manage loading and error states in complex route hierarchies using specialized file conventions. Implement loading.tsx for immediate UI feedback during data fetching and error.tsx to isolate and handle runtime errors within specific route segments.

Parallel routes render multiple pages simultaneously within a single layout using named slots. Intercepting routes overlay content like modals over the current context, preserving the original route state upon navigation back.

Yes, server components are the default for data fetching across App Router segments. Fetch data directly within server components to leverage server-side rendering capabilities and streamline your application's data flow architecture.

Use route groups in your Next.js application to organize routes logically without affecting the URL path. They allow you to share layouts and routing files across specific segments, keeping your project structure clean and modular.