Questions
5 of 33
1Explain server-side rendering (SSR) in Next.js.
2List the benefits of Server-Side Rendering in Next.js.
3What are server components?
4How to use server components in next js?
5What is the React Server Component Payload (RSC)?
6Describe how server components are rendered.
7Describe server rendering strategies
8How can you keep Server-only Code out of the Client Environment
9What are the issues of using context provider at the root of the application?
10List dynamic functions available to server components.
11List all Dynamic APIs.
12How do we opt for Static Rendering, Dynamic Rendering and Streaming?
13Explain the difference between SSR, SSG, ISR, and CSR in Next.js. When would you choose each?
14How does getServerSideProps work internally? What is its execution context?
15What are the performance trade-offs of SSR vs SSG in a high-traffic production app?
16How does Next.js handle hydration? What is a hydration mismatch, and how do you debug it?
17What happens when getServerSideProps throws an error? How do you handle it gracefully?
18How would you architect a Next.js app that needs both personalised (SSR) and cacheable (SSG) pages at scale?
19Explain the App Router vs Pages Router SSR model differences. How does React Server Components change the SSR paradigm?
20How do React Server Components (RSC) differ from traditional SSR? Can they be used together?
21How does streaming SSR work in Next.js 13+? What role does Suspense play?
22How would you implement partial hydration or Islands Architecture in Next.js?
23Explain how Next.js handles data fetching waterfall problems in SSR and how you'd mitigate them.
24How would you implement partial hydration or Islands Architecture in Next.js?
25How do you implement caching strategies for SSR responses in Next.js? (CDN, Cache-Control, stale-while-revalidate)
26How would you reduce TTFB (Time to First Byte) in an SSR-heavy Next.js app?
27What's the difference between fetch caching in the App Router vs traditional getServerSideProps?
28How do you avoid redundant database/API calls across multiple server components on the same page?
29How do you securely handle authentication in SSR? What are the risks of passing tokens via cookies vs headers?
30How do you prevent sensitive server-side data from leaking to the client bundle?
31How would you implement role-based rendering on the server without exposing protected routes to the client?
32How do you debug SSR-only issues that don't appear in local development?
33How can we control dynamic rendering behaviour in next js?
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Runtime
Compiler
SSG
SSR
CSR
Routing
Route Handlers
Route Groups
Dynamic Routes
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05 / 33

What is the React Server Component Payload (RSC)?

Difficulty: 6/10
server components, payload serialization, streaming

The RSC Payload is a compact binary representation of the rendered React Server Components tree. It's used by React on the client to update the browser's DOM.

The RSC Payload contains:
  1. 1

    The rendered result of Server Components

  2. 2

    Placeholders for where Client Components should be rendered and references to their JavaScript files

  3. 3

    Any props passed from a Server Component to a Client Component

Scenario Questions

0-2 years experience

  1. 1If you add a new prop to a server component, what changes in the payload that Next.js sends to the client?
  2. 2What happens if you accidentally import a client‑only module inside a server component—how does that affect the RSC payload?

2-5 years experience

  1. 1We noticed a page using server components is loading slowly because the RSC payload is large. How would you investigate and reduce its size?
  2. 2During a migration a server component started throwing a serialization error. Walk me through debugging the RSC payload to locate the problematic value.

5-8 years experience

  1. 1Design a strategy for caching React Server Component payloads at the CDN edge while still delivering fresh data for personalized sections. What trade‑offs do you consider?
  2. 2Explain how you would handle streaming a very large RSC payload to improve Time‑to‑First‑Byte without breaking client hydration.

8+ years experience

  1. 1Our organization wants to migrate a legacy monolith to Next.js with server components. How would you plan the rollout of RSC payload handling across multiple teams, considering versioning, backward compatibility, and monitoring?
  2. 2Discuss the long‑term maintenance implications of customizing the RSC serializer for proprietary data types. How would you mitigate risks across the codebase?

Follow-up Questions

  • Can you give an example of a data type that the default RSC serializer cannot handle?
  • How does Next.js differentiate server‑only from client components at build time?
  • What effect does the size of the RSC payload have on SEO and initial page load?
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