nextjs-app-router

Structure scalable Next.js App Router architectures by implementing nested layouts, route groups, parallel routes, and intercepted routes. This enforces best-practice conventions using layout.tsx, loading.tsx, error.tsx, and not-found.tsx for robust page rendering.

Parallel routes render multiple independent pages simultaneously within a single layout, while intercepted routes intercept navigation paths to display content like modals without losing the original route context in Next.js.

Refactor large Next.js apps to adopt the App Router by enforcing layout.tsx persistence and implementing loading, error, and not-found routes. This ensures proper error handling without breaking existing pages during the migration.

Use Next.js route groups to logically organize routes without affecting the URL structure, while nested layouts persist UI components via layout.tsx across route changes, maintaining persistent headers or sidebars.

Yes, implement proper error handling in the Next.js App Router by using loading.tsx for fallback UI, error.tsx to catch errors, and not-found.tsx for missing pages. This conforms to App Router conventions and ensures layout persistence.