Question 1

How do I decide between Server and Client Components in Next.js?

Accepted Answer

Default to a Server Component and add 'use client' only when the component uses state hooks like useState, effects like useEffect, browser APIs such as window or localStorage, or component-level event handlers. If none of these apply, leave it on the server.

Question 2

Where should I place the 'use client' directive in a React app?

Accepted Answer

Place 'use client' as far down the component tree as possible, isolating only the interactive leaf components. Marking a page or layout as client converts its entire subtree, shipping unnecessary JavaScript to the browser.

Question 3

Can a Server Component be a child of a Client Component?

Accepted Answer

Yes, a Client Component can receive Server Components through its children prop, enabling client-wraps-server composition. The inverse, importing a Client Component's parent as server inside client code, is not allowed.

Question 4

Should forms in Next.js use Client Components or Server Actions?

Accepted Answer

Use Server Actions with 'use server' called from a Server Component form so the HTML is server-rendered with progressive enhancement. Only wrap individual inputs in Client Components when you need controlled state for validation feedback.

Question 5

Why is my Next.js page shipping too much JavaScript?

Accepted Answer

Excessive JS usually means too many components are marked 'use client', often at the page or layout level. Audit the Network tab for JS payload size and push client boundaries down to only the components using state, effects, or browser APIs.

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