Meta · React

Meta React interview questions

Practice React questions specifically asked in Meta interviews – ideal for online test preparation, technical rounds and final HR discussions.

Company: MetaSubject: React110 questions in this page

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Meta · React questions (110)

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1. React is mainly used for developing ______.

Difficulty: EasyType: MCQTopic: React Basics

React focuses on building interactive user interfaces for web and mobile apps. It doesn't handle databases or backend logic.

2. List some commonly used built-in Hooks.

Difficulty: EasyType: SubjectiveTopic: Hooks

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Meta React interview questions

Quick overview

1. React is mainly used for developing ______.

2. List some commonly used built-in Hooks.

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3. ______ is a necessary API for every React.js component.

4. What are the different ways to style React components?

5. What are the advantages of using React?

6. What are Higher-Order Components (HOCs) and when are they needed?

7. What is StrictMode in React and what does it help detect?

8. What is the purpose of ReactDOM.render()?

9. What is JSX? Why do we use it in React?

10. What are props in React?

11. Explain the unidirectional data flow in React.

12. What is React or ReactJS?

13. What is prop drilling in React?

14. Do React Hooks cover all class component functionalities?

15. What are the different phases of the React component lifecycle?

16. What are some techniques to optimize React app performance?

17. What is the usage of setState()?

18. What is used for passing data to a component from outside?

19. What are React Hooks and why were they introduced?

20. How to structure React components and folder hierarchy for a real project?

21. Explain the lifecycle of a React component (mount, update, unmount).

22. What are fragments and why are they used?

23. What are portals in React?

24. What are common security practices for React apps?

25. How can you pass data between React components (parent → child and child → parent)?

26. How can you create a functional component that returns a static layout using JSX?

27. Differentiate React Hooks and Classes in syntax and behavior.

28. How can you prevent unnecessary re-renders in React?

29. How can you optimize performance in a React app?

30. What are the main features of React?

31. What is the purpose of useEffect()?

32. Can we write React without JSX? If yes, how?

33. What are keys in React and why are they important?

34. When should you use keys and what happens if you don’t provide them?

35. What are some ways to avoid prop drilling?

36. Explain how refs work in uncontrolled components.

37. What are functional components and class components in React?

38. Explain the differences between functional and class components.

39. How do you handle props in functional vs class components?

40. How do you handle state in class vs functional components?

41. What is useState() and how does it work?

42. What are controlled and uncontrolled components in React?

43. Why are controlled components preferred for form handling?

44. How do you update state in a class component using setState()?

45. Why shouldn’t you modify the state directly?

46. What are side effects in React components?

47. What are the two types of side effects?

48. How does React handle memory cleanup in useEffect()?

49. What does state represent in React?

50. What is the syntax of useEffect(callback, [dependencies])?

51. How does the dependency array in useEffect work?

52. What are the rules that must be followed while using Hooks?

53. What is the purpose of useRef() hook?

54. What are the use cases of refs in functional components?

55. Why do React Hooks make use of refs?

56. When should you create a custom hook?

57. What are the advantages of custom hooks?

58. Which of the following manages side effects in functional components?

59. What Hook is used for managing state in functional components?

60. Which rule is true for Hooks?

61. How does React Context API help in managing global data?

62. What are Higher-Order Components (HOCs)?

63. Compare HOCs and custom hooks.

64. What are render props in React?

65. What are error boundaries and how do they work?

66. In which lifecycle methods can you catch errors using an error boundary?

67. What is React reconciliation?

68. How does React decide when to re-render a component?

69. What are Pure Components and what is memoization (React.memo, useMemo, useCallback)?

70. How to perform automatic redirect after login in React?

71. What is the difference between <Navigate> and <Redirect> in React Router?

72. What are dynamic routes in React Router?

73. How to protect private routes in React?

74. What is code splitting and why is it useful?

75. How do you implement lazy loading of components in React?

76. How do you manage global state in React (Redux, Zustand, Context API)?

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