Questions
3 of 27
1What are client components?
2How to implement client rendering in next js?
3Describe how client components are rendered.
4How to decide what part should be rendered on the server and what on the client?
5Combining client and server components
6How to render a server component in the client component?
7Discuss best approaches with client components.
8Does using 'use client' ensure that the component only renders on the client?
9Explain the full lifecycle of a CSR page in Next.js — from initial HTML delivery to interactive UI.
10What is the difference between useEffect data fetching and React Query / SWR in a CSR context?
11When would you choose CSR over SSR or SSG in a production Next.js app? Give real-world examples.
12How does React's concurrent rendering model affect CSR behaviour in Next.js 13+?
13How do you handle deeply nested Client Components without causing unnecessary re-renders?
14Explain the concept of "client component boundaries" — how do they affect the component tree?
15How would you implement optimistic UI updates in a CSR-heavy Next.js application?
16What are the challenges of using Context API at scale in a CSR and SSR? How do you solve them?
17How does next/dynamic work? How is it different from React's lazy() and Suspense?
18What is the "flash of unstyled/unloaded content" problem in CSR, and how do you prevent it?
19How do you prefetch data for CSR pages in Next.js to reduce perceived latency?
20How do useMemo and useCallback help performance in CSR components? When are they overkill?
21How do you implement skeleton screens or loading states for CSR data fetching?
22Compare SWR vs React Query vs useEffect for client-side data fetching — when do you use each?
23How do you implement infinite scrolling or pagination purely on the client side in Next.js?
24How do you handle race conditions in CSR data fetching with useEffect?
25What is the difference between client-side fetch and server actions in Next.js App Router?
26How do you cancel in-flight API requests when a component unmounts in CSR?
27How would you handle real-time data (WebSockets / SSE) in a Next.js CSR component?
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03 / 27

Describe how client components are rendered.

It depends on whether the request is part of a full page load or a subsequent navigation.

Full page load
  1. 1

    To optimize the initial page load, Next.js will use React's APIs to render a static HTML preview on the server for both Client and Server Components. This means, when the user first visits your application, they will see the content of the page immediately, without having to wait for the client to download, parse, and execute the Client Component JavaScript bundle.

  2. 2

    On the server React renders Server Components into a special data format called the React Server Component Payload (RSC Payload), which includes references to Client Components. Next.js uses the RSC Payload and Client Component JavaScript instructions to render HTML for the route on the server.

  3. 3

    Then, on the client the HTML is used to immediately show a fast non-interactive initial preview of the route. The React Server Components Payload is used to reconcile the Client and Server Component trees, and update the DOM. The JavaScript instructions are used to hydrate Client Components and make their UI interactive.

Subsequent Navigations
  1. 1

    On subsequent navigations, Client Components are rendered entirely on the client, without the server-rendered HTML.

  2. 2

    This means the Client Component JavaScript bundle is downloaded and parsed. Once the bundle is ready, React will use the RSC Payload to reconcile the Client and Server Component trees, and update the DOM.