Next.js

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1. 01 Explain the App Router's file-based conventions and how nested layouts compose. Medium
2. 02 Migrate a large Pages Router app to App Router - what's your phased strategy? Hard
3. 03 Explain getStaticProps vs getServerSideProps vs getInitialProps. Medium
4. 04 Why might a team stay on Pages Router instead of migrating to App Router? Hard
5. 05 Explain how dynamic and catch-all routes work in Next.js. Medium
6. 06 Design the routing structure for a multi-tenant SaaS app with custom domains per tenant. Hard
7. 07 Explain the Metadata API and how it differs from manually managing head tags. Medium
8. 08 Design dynamic metadata generation for a product page pulling from a CMS. Hard
9. 09 Explain how nested layouts avoid re-rendering shared UI on navigation. Medium
10. 10 Design a layout structure for an app with a persistent sidebar and independently loading content panes. Hard
11. 11 Explain Next.js Middleware and its execution constraints under the Edge runtime. Medium
12. 12 Design an authentication and A/B testing strategy using Middleware. Hard
13. 13 Explain how Server Actions work and their security implications. Medium
14. 14 Design a form submission flow using Server Actions with optimistic UI updates. Hard
15. 15 Explain the four caching layers in the Next.js App Router: request memoization, data cache, full route cache, router cache. Medium
16. 16 Debug a page that's serving stale data despite calling revalidatePath. Hard
17. 17 Explain the difference between time-based and on-demand revalidation. Medium
18. 18 Design a revalidation strategy for a live sports score page updated every 10 seconds. Hard
19. 19 Explain how next/image optimizes images and handles responsive sizing. Medium
20. 20 Debug a Largest Contentful Paint regression caused by a misconfigured next/image priority prop. Hard