javascript / expert
Snippet
Granular Cache Invalidation with Tagged Data Fetching
Leverage Next.js unstable_cache to wrap expensive asynchronous operations (like DB queries) with a unique key and revalidation tags. This allows for surgical invalidation of specific cache entries using revalidateTag without clearing the entire cache.
snippet.js
javascript
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import { unstable_cache } from 'next/cache';export const getCachedData = (userId) =>unstable_cache(async () => fetchUserStats(userId),['user-stats', userId],{tags: [`user-${userId}`, 'global-stats'],revalidate: 3600})();
nextjs
Breakdown
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unstable_cache(...)
Wraps the data-fetching function in a memoized layer.
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['user-stats', userId]
The unique key used to identify this specific cache entry.
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tags: [...]
Custom identifiers used for on-demand invalidation via revalidateTag.