react-nextjs

Data fetching and state management in Next.js App Router are handled using Server Components for initial data loads, while client state can be managed with Zustand and server state with TanStack Query.

Form submissions in React 19 are best handled using Server Actions and the useActionState hook, which facilitate efficient data mutations and validation directly within your Next.js App Router components.

Server and Client Components in Next.js 16 are combined by fetching data on the server and passing it to interactive client components, allowing you to build dynamic pages with optimized performance.

Yes, the use cache directive is supported for performance optimization in Next.js, alongside best practices for image loading, lazy loading, and auto-memoization to enhance application speed.

Testing strategies for React 19 and Next.js applications include using Vitest for unit tests and Playwright for end-to-end testing, ensuring your server and client components function correctly.