RTK Query: Caching, Loading, and Syncing Server State

Server state is different from client state — it belongs to the server and needs caching, invalidation, and refetching. RTK Query automates all of it.

The cache as the source of truth

Define an API with endpoints, and RTK Query caches results, dedupes requests, and exposes loading and error flags automatically.

Invalidation with tags

Tag cached data by entity. After a mutation, related queries revalidate, so your UI reflects server truth without manual orchestration.

Optimistic updates

Apply mutations optimistically for instant feedback, then reconcile or roll back on the server's response.

Wrapping up

RTK Query removes whole classes of boilerplate and synchronisation bugs, especially in data-rich dashboards.