The original title is: "Server state and client state: why React apps need two libraries"

Short summary

React apps manage two fundamentally different kinds of state: server state (remote data snapshots needing caching, deduplication, refetching, and invalidation) and client state (app-owned data like preferences and UI flags that never go stale). Mixing them in one general-purpose store with hand-rolled thunks creates maintenance debt as an app grows. The article recommends pairing a purpose-built server-state library (RTK Query or TanStack Query) with a lightweight client store (Redux slices or Zustand) so each kind gets the right tool.

• •Server state needs caching, deduplication, retry, invalidation — use RTK Query or TanStack Query
• •Client state is app-owned, never stale — a small Zustand store or Redux slices suffice
• •Don't force both through one general-purpose store with hand-built thunks

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