Server Components vs Client Components: When to Use Which

Understanding Server and Client Components

If you're building with Next.js, you’ll quickly encounter Server Components and Client Components. But which one should you use?

Server Components run on the server and are ideal for fetching data, accessing databases, and keeping sensitive logic away from the browser. They can also help reduce the amount of JavaScript sent to users.

Client Components, marked with use client, run in the browser. Use them when your component needs interactivity, such as state, event handlers, forms, or browser APIs.

Think of Server Components as your application's backend kitchen, while Client Components are the part customers interact with directly.

When Should You Use Each?

Choose Server Components for static content, data fetching, authentication checks, and database operations. Choose Client Components for interactive UI elements like dropdowns, modals, counters, and dynamic forms.

FAQs

Can Server Components use "useState"?
No. React hooks that require browser-side interaction, such as useStateand useEffect, belong in Client Components.

Should every component use "use client"?
No. Add it only where client-side functionality is actually required.