40 React Interview Questions to Help You Secure Your Next Job

If you're preparing for your first React interview or just want to stay sharp, these questions cover the key topics you need to know. Take a look and get ready to ace that interview!

1. What is React?
2. What is useMemo?
3. What are the features of React?
4. What is JSX?
5. What is the DOM?
6. What is the Virtual DOM?
7. What is the component lifecycle of a React class component?
8. What are fragments in React?
9. What are props in React?
10. What are synthetic events in React?
11. What are the differences between `package.json` and `package-lock.json`?
12. What are the differences between client-side and server-side rendering?
13. What is state in React?
14. What are props?
15. What are the differences between state and props in React?
16. What is props drilling?
17. What are the disadvantages of props drilling, and how can we avoid it?
18. What are pure components in React?
19. What are refs in React?
20. What is meant by forward ref?
21. What are error boundaries?
22. What are higher-order components in React?
23. What are the differences between controlled and uncontrolled components?
24. What is useCallback?
25. What are the differences between useMemo and useCallback?
26. What are keys in React?
27. What is lazy loading in React?
28. What is suspense in React?
29. What are custom hooks?
30. What is the useReducer hook?
31. What are portals in React?
32. What is context in React?
33. What is the purpose of a callback function as an argument of setState()?
34. Give an example of Context API usage.
35. Create a custom hook for an increment/decrement counter.
36. Which lifecycle hooks in class components are replaced with useEffect in functional components?
37. What is Strict Mode in React?
38. What are the different ways to pass data from a child component to a parent component in React?
39. How to send data from child to parent using callback functions?
40. How to send data from a child component to a parent using useRef?

Start preparing this questions and boost your confidence for your next interview!

Follow Ashish Misal on LinkedIn for Interview Related Content.

#React #InterviewQuestions #WebDevelopment #Frontend #JavaScript #ReactJS #CareerGrowth #TechInterviews #FullStackWebDevelopment #FrontendDeveloper