nextjs-15

Next.js 15 App Router conventions use specific files like layout.tsx, page.tsx, loading.tsx, error.tsx, and not-found.tsx to manage routing, UI states, and errors. Route groups such as (auth)/ organize folders without affecting the URL path.

Server Actions handle form submissions and data mutations directly within server components. You define asynchronous functions to process form data on the server, eliminating the need for separate API endpoints.

Parallel data fetching in Next.js server components allows multiple data requests to execute concurrently rather than sequentially. Wrapping these requests in Suspense boundaries enables streaming UI, rendering components as data resolves.

Yes, the App Router supports middleware usage and api/ route handlers. Route handlers allow you to create custom request endpoints, while middleware enables you to run code before a request completes.

Setting up a minimal Next.js 15 project requires initializing the project, installing dependencies, and starting the dev server. You then create app/layout.tsx, app/page.tsx, and a sample server action to observe routing updates.