How do fetch cache options work in the App Router?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Next.js conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
The fetch API in server components supports caching controls via { next: { revalidate } } and cache modes like cache: 'no-store' or cache: 'force-cache'. Use no-store for always-fresh data and force-cache to reuse cached responses.
const res = await fetch("https://api.example.com/data", {
cache: "no-store",
});
// or
const res2 = await fetch("/api/data", { next: { revalidate: 60 } });
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.