TOPIC OVERVIEW

nextjs/SSR

Rendering fresh HTML on the server, for every single request.

10 QuestionsIntermediateHigh Priority ~11 min read

Server-Side Rendering builds a page's HTML on the server at request time, rather than in advance. It's necessary whenever a page genuinely depends on something only known at the moment of the request — the logged-in user, request cookies, live data that can't be pre-computed — and in the App Router, this happens automatically the moment a component reads any of that request-specific data.

The real cost of SSR is that every request triggers a fresh render, meaning there's no pre-built HTML to serve instantly the way SSG has — time-to-first-byte is inherently slower, and server load scales with traffic in a way static pages don't. Streaming, via Suspense boundaries, is how Next.js softens this: instead of waiting for the entire page to finish rendering before sending anything, it sends the parts that are ready first and streams the rest in as they finish.

What you'll walk away knowing

What forces a route into SSR rather than being statically generated

Why SSR pages have a slower time-to-first-byte than SSG pages, and what causes that cost

How streaming with Suspense boundaries lets parts of an SSR page reach the browser before the whole render finishes

When SSR is genuinely necessary versus when SSG plus client-side fetching would work just as well

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

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