Top 41 Redux / State Management Interview Questions & Answers (2026)

01 What is Redux? 02 What are Redux actions? 03 What is a Redux reducer? 04 What is the Redux store? 05 What is Redux Toolkit? 06 What is the difference between Redux and React Context API? 07 What are Redux Toolkit slices? 08 What is useSelector and useDispatch in React-Redux? 09 What is Redux Thunk? 10 What is Zustand? 11 What is Jotai? 12 What is React Query (TanStack Query)? 13 What is the Redux Devtools Extension? 14 What is Recoil? 15 What is MobX? 16 What is the difference between Redux and MobX? 17 What are selectors in Redux? 18 What is RTK Query? 19 What is the Context API for state management? 20 What is useReducer in React?

01 How do you handle async operations in Redux Toolkit with createAsyncThunk? 02 What is Zustand's middleware system? 03 What is Reselect and memoized selectors? 04 How does normalized state shape work in Redux? 05 What is the Flux architecture pattern? 06 How do you test Redux applications? 07 What is the immer library and how does it work with Redux? 08 How do you implement optimistic updates with Redux Toolkit? 09 What is Valtio? 10 How do you handle forms state in React? 11 What is the difference between local state, global state, and server state? 12 What are Redux middleware and how do you write a custom one?

01 How do you architect state management for large-scale React applications? 02 What is Redux-Saga and how does it differ from Thunks? 03 What is XState and state machines in UI development? 04 How does TanStack Query's caching and staleness model work? 05 What are the patterns for sharing state between micro-frontends? 06 How do you handle real-time state updates with WebSockets and Redux? 07 What are the advanced patterns for selector composition? 08 What is the proxy state pattern (Valtio / Immer) versus immutable state? 09 How do you migrate from Redux to a modern state management solution?