Blog · Next.js
Next.js caching explained for product engineers
Published 2026-02-18 · 8 min read
A plain-language overview of request memoization, data cache, and revalidation—and how bugs show up when caching is misunderstood.
Layers
Caching exists at multiple layers; misattributing stale UI to “React” is common when the data cache is the culprit.
Common bugs
Stale authenticated dashboards after role changes often trace to cache invalidation gaps.
Best practice
Document per-route caching decisions; test role changes and revalidation paths explicitly.
Frequently asked questions
- Disable all caching?
- Rarely the right fix—targeted invalidation is usually healthier.
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