Mastering React Server Components in Next.js 15

Why Server Components?

React Server Components (RSC) allow developers to write UI that renders and caches on the server. This means zero JavaScript is sent to the client for these components, drastically reducing the bundle size and improving the Time to Interactive (TTI).

The Balancing Act

Not everything should be a Server Component. You still need Client Components for interactivity (useState, useEffect, event listeners). The golden rule is to keep Server Components at the top of your component tree and push Client Components down to the leaves.

Next.js App Router

Next.js leverages RSCs natively with the App Router. By fetching data directly in Server Components, you eliminate the need for getServerSideProps and simplify your data fetching strategy immensely.