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All Redux Interview Questions

Practice the complete collection of Redux interview questions including theory, coding, MCQs and real interview problems.

Total Questions: 79Topics: 28Complete interview preparation

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All Redux Interview Questions (79)

Scroll through every important Redux question asked in real interviews. Includes MCQs, subjective questions, and coding prompts.

1. What is Redux?

Difficulty: EasyType: MCQTopic: Redux Basics

A state management library for JavaScript applications
A component library for React
A CSS framework
A database management system

Redux is a predictable state container for JavaScript applications that helps manage application state in a centralized store. It can be used with any UI library or framework, though it's commonly used with React. Redux follows strict patterns to make state changes predictable and easier to debug.

Correct Answer: A state management library for JavaScript applications

2. How many core principles does Redux follow?

Difficulty: MediumType: MCQTopic: Redux Basics

2 principles
3 principles
4 principles
5 principles

Redux follows three fundamental principles: Single source of truth (one store), State is read-only (changes only through actions), and Changes are made with pure functions (reducers). These principles ensure predictability and make debugging easier by maintaining a clear data flow pattern.

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All Redux Interview Questions

Overview

1. What is Redux?

2. How many core principles does Redux follow?

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3. What method is used to create a Redux store?

4. What is an action in Redux?

5. What should a Redux reducer always return?

6. What does the dispatch() method do in Redux?

7. Why is state immutability important in Redux?

8. Which of the following makes a reducer a pure function?

9. Explain the unidirectional data flow in Redux.

10. What are the three main methods provided by the Redux store and what do they do?

11. What is an action creator and why is it useful?

12. How should you structure state in a Redux store and why?

13. What is reducer composition and how does combineReducers work?

14. When would you choose Redux over React Context API?

15. What is Redux middleware and what problems does it solve?

16. What is Redux Toolkit (RTK)?

17. What does configureStore() provide by default compared to createStore()?

18. What does createSlice() automatically generate?

19. What does Immer allow you to do in RTK reducers?

20. What is the purpose of createAction() in RTK?

21. Which approach is recommended when using RTK?

22. When should you use extraReducers in createSlice?

23. How does RTK integrate with RTK Query?

24. What are the main advantages of using Redux Toolkit over vanilla Redux?

25. Explain how createSlice works and what it returns.

26. How does Immer work in RTK reducers and what should you be careful about?

27. What configuration options does configureStore accept and when would you customize them?

28. What is createAsyncThunk and how does it simplify async logic in RTK?

29. Should you define selectors in your slice file and why?

30. How does RTK improve TypeScript support compared to vanilla Redux?

31. How does RTK enhance the development experience with DevTools?

32. What is RTK Query?

33. What is the core function for defining RTK Query APIs?

34. What is the main difference between a query and a mutation in RTK Query?

35. What naming convention does RTK Query use for auto-generated hooks?

36. How long does RTK Query keep unused data in cache by default?

37. What is the purpose of providesTags in RTK Query?

38. When does RTK Query refetch queries after a mutation with invalidatesTags?

39. What is fetchBaseQuery in RTK Query?

40. What are the main benefits of using RTK Query for data fetching?

41. How do you define endpoints in createApi and what options are available?

42. Explain the tag-based cache invalidation system in RTK Query with an example.

43. What does an RTK Query hook return and how do you use it in components?

44. How do mutation hooks work differently from query hooks in RTK Query?

45. How can you implement polling and automatic refetching in RTK Query?

46. What are optimistic updates in RTK Query and how do you implement them?

47. When and how would you customize the baseQuery in RTK Query?

48. What actions does createAsyncThunk automatically dispatch?

49. What is the primary purpose of Redux middleware?

50. What does redux-thunk middleware allow you to dispatch?

51. What feature does Redux DevTools provide for debugging?

52. What is the recommended way to structure normalized state in Redux?

53. What are selectors in Redux?

54. Why should you use memoized selectors from reselect?

55. What is the main advantage of Redux Saga over Redux Thunk?

56. Explain how to use createAsyncThunk and handle its lifecycle in extraReducers.

57. How does the Redux middleware chain work and in what order are middleware executed?

58. How do you create custom Redux middleware and when would you need one?

59. What advanced debugging techniques can you use with Redux DevTools?

60. How do you compose selectors and why is this pattern useful?

61. What is createEntityAdapter in RTK and how does it help with normalized state?

62. What are the key strategies for optimizing Redux performance?

63. How should you handle errors in async operations with createAsyncThunk?

64. When should you NOT use Redux in your application?

65. What is the recommended folder structure for Redux Toolkit projects?

66. What is the best approach to test Redux reducers?

67. Which of the following is a common anti-pattern in Redux?

68. What is a key advantage of Redux over Zustand or Jotai?

69. Can you dynamically inject reducers in Redux Toolkit?

70. Why should Redux state be serializable?

71. What is the recommended approach for migrating from Redux to Redux Toolkit?

72. Describe the recommended folder structure for a large Redux Toolkit application with examples.

73. How do you test createAsyncThunk functions and what should you test?

74. What principles should guide how you design your Redux state shape?

75. What are the most common Redux anti-patterns and how do you avoid them?

76. What are the essential best practices for using Redux in production applications?

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