3 pages from the guide: the cover, the contents (75 questions in 8 sections) and one complete question with its answer, code and interview tips.
The App Router changed how React apps are built: components run on the server by default, caching is opt-in, middleware is now called proxy, and params and cookies are read asynchronously. This guide covers 75 questions written against the Next.js 16 documentation: file conventions and layouts, the server and client boundary, the Cache Components caching model, Server Actions and forms, rendering strategies, proxy.ts and authentication, Route Handlers, images, fonts and metadata, and self-hosting with Docker.
75 questions in 8 sections, 74 code examples in a 95-page PDF (2026 edition).
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Read each quick answer out loud first, then open the explanation and the trap. Build a small App Router project and try the routing, caching and Server Actions snippets yourself, then practise the follow-up questions without notes.
updateTag(tag) expires a tag immediately for read-your-own-writes and works only in Server Actions. revalidateTag(tag, 'max') marks it stale and serves stale content while refreshing (stale-while-revalidate); it works in Server Actions and Route Handlers and needs a second argument. revalidatePath(path) invalidates a route by URL. refresh() only refetches the current route's payload and leaves cached data alone.
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It covers this topic in depth. It is one topic from the TechTribers Java Interview Series, which has all 23 parts (1,200+ questions) in one bundle.
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100 React 19 interview questions with answers: hooks, Actions, useActionState, the use API, Server Components, performance, testing, accessibility and what-is-wrong-with-this-component bugs.
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100 JavaScript "what is the output?" interview questions with answers: coercion, hoisting, closures, this, prototypes, the event loop, promises and async/await. Outputs run on Node.js.
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