Questions
6 of 8
Discuss Full Route Cache?
Difficulty: 6/10
caching, ISR, performance
Next.js automatically renders and caches routes at build time. This is an optimization that allows you to serve the cached route instead of rendering on the server for every request, resulting in faster page loads.The default behavior of Next.js is to cache the rendered result (React Server Component Payload and HTML) of a route on the server. This applies to statically rendered routes at build time, or during revalidation.
Scenario Questions
0-2 years experience
- 1We have a new page that fetches data at build time. How would you enable Full Route Cache for it, and what files or config would you modify?
- 2If a user reports that after deploying a change the page still shows the old content, what could be happening with the Full Route Cache and how would you verify it?
2-5 years experience
- 1Your team notices that a frequently visited product page is still loading slowly even though you enabled Full Route Cache. Walk me through how you would debug the cache behavior.
- 2Explain the trade‑offs between using Full Route Cache versus client‑side data fetching for a page that shows both static product info and real‑time inventory.
- 3During a rollout, a feature flag disables a component on a cached route. Why might the flag not take effect immediately, and how would you fix it?
5-8 years experience
- 1Design a caching strategy for a news site that uses Next.js, where most articles are static but some sections need per‑user personalization. How would you combine Full Route Cache with other caching mechanisms?
- 2What edge cases can cause stale data in Full Route Cache when using ISR with a short revalidation interval, and how would you mitigate them?
- 3If your application runs on a multi‑region deployment, how does Full Route Cache interact with CDN edge caching, and what configuration would you adjust to minimize latency and cache incoherence?
8+ years experience
- 1Your organization is migrating several SSR pages to use Full Route Cache to reduce server load. What architectural considerations, migration steps, and cross‑team coordination would you plan?
- 2Discuss the long‑term maintenance implications of relying heavily on Full Route Cache across many services. How would you ensure observability, cache invalidation policies, and backward compatibility?
- 3If a new regulatory requirement forces you to purge user‑specific data from caches within minutes, how would you adapt the Full Route Cache implementation at scale?
Follow-up Questions
- What metrics would you watch to know the cache is helping?
- How would you handle a page that mixes static and user‑specific data?
- Can you compare Full Route Cache with component‑level or client‑side caching?