nextjs-patterns

Next.js 15 App Router pages and layouts require a clear file structure with consistent component usage. You organize nested layouts, loading and error states, and pages within the app directory following the App Router paradigm to build a multi-page application.

Protected routes in Next.js middleware are implemented by intercepting requests and validating authentication. You configure middleware to guard specific paths across your multi-page application, ensuring only authorized users access protected content.

Server components and client components interact through clear boundaries defined by the App Router paradigm. You maintain consistent component usage by isolating client-side interactivity within server-rendered layouts and pages to preserve performance.

Loading and error states for Next.js API routes are handled by wrapping route segments with dedicated loading and error UI files. You apply these patterns across your multi-page application to manage data fetching delays and runtime failures.

You can use these Next.js routing patterns for an existing project by replicating the provided app structure. Inspect the templates and align your existing file structure and conventions with the App Router paradigm to integrate layouts and middleware.

You should avoid nested layouts in a Next.js multi-page app when a route requires completely independent UI without shared structural elements. Overusing nested layouts adds unnecessary file structure complexity for pages that do not share visual boundaries.