React.js Interview Questions for Freshers – Nittalks

A brief and beginner-friendly set of React.js interview questions for freshers, covering React basics, JSX, components, props and state, React Hooks, Virtual DOM, and React Router. Ideal for entry-level React developer interviews, front-end developer interview preparation, and React fresher technical rounds.

1. What is React.js?
2. Why is React used?
3. What are the main features of React?
4. What is JSX?
5. Can React work without JSX?
6. What is the Virtual DOM?
7. How does Virtual DOM improve performance?
8. What is a component in React?
9. What are the types of components in React?
10. What is the difference between functional and class components?
11. What are props in React?
12. Are props mutable or immutable?
13. What is state in React?
14. Difference between state and props
15. What are React Hooks?
16. Why were Hooks introduced?
17. What is useState?
18. What is useEffect?
19. When does useEffect run?
20. What is conditional rendering?
21. What are keys in React?
22. Why are keys important in lists?
23. What is lifting state up?
24. What is Context API?
25. What is prop drilling?
26. What is a controlled component?
27. What is an uncontrolled component?
28. How do you handle events in React?
29. What is React Fragment?
30. What is React Router?
31. Difference between BrowserRouter and HashRouter
32. What is SPA (Single Page Application)?
33. How does routing work in React?
34. What is reconciliation?
35. What is React.memo?
36. What is useMemo?
37. What is useCallback?
38. What is lazy loading in React?
39. How do you optimize performance in React?
40. What is the difference between npm and npx?
41. What is Vite? How is it different from CRA?
42. What is package.json?
43. What is the role of key in React?
44. How do you pass data from child to parent?
45. How do you fetch API data in React?
46. What is Axios?
47. What is CORS?
48. What are error boundaries?
49. What is Strict Mode in React?
50. What are common mistakes beginners make in React?

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