Senior LevelReact JS & React 19
What are the 4 caching layers in Next.js App Router (RSC Payload, Router Cache, Data Cache, Full Route)?
❓ Interview Prompt: Explain Next.js App Router 4 caching layers: Request Memoization, Data Cache, Full Route Cache, and Client Router Cache.
Next.js App Router implements a multi-tier caching hierarchy:
1
Request Memoization: Deduplicates identical 'fetch' requests during a single render pass.
2
Data Cache: Persistent HTTP 'fetch' cache on the server across requests ('fetch(url, { revalidate: 3600 })').
3
Full Route Cache: Static HTML and RSC payload cached at build time on the server.
4
Client Router Cache: In-memory client browser cache storing RSC payloads during session navigation.
Code Implementation Example
jsx
// Opt out of Data Cache for real-time data fetch
const data = await fetch('https://api.example.com/live', {
cache: 'no-store' // Disables Data Cache layer
});💡Configuring Next.js fetch caching options across App Router caching layers.
🎯 Interview Key Takeaway
Understand the 4 Next.js caching layers (Request Memoization, Data Cache, Full Route Cache, Router Cache) to control dynamic data invalidation.
#Next.js#Caching#App Router#RSC#Senior
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