Optimistic Updates and Cache Invalidation
Make mutations feel instant with optimistic UI, then keep server and client state consistent using React Query invalidation and Next.js revalidation tools.
What Are Optimistic Updates
An optimistic update applies a mutation to the UI immediately, before the server confirms it. If the request fails, you roll back. This makes apps feel instant.
- Update local cache right away.
- Send the request.
- Reconcile or roll back on the response.
The Tradeoff
Optimism improves perceived speed but risks showing stale or wrong data briefly. Use it for high-confidence actions like likes, toggles, and list edits, not for risky financial operations.
All lessons in this course
- React Query for Server State
- Client-Side State with Zustand/Jotai
- Server-Side Caching Strategies
- Optimistic Updates and Cache Invalidation