30+ ReactJs Interview Questions

ReactJS Interview Questions:

1. What is React js
2. What is difference between virtual dom and shallow dom, dom in React js
3. What is controlled and uncontrolled component in React js
4. What is hooks in React js
5. What is jsx, babel, webpack
6. What is Redux
7. What is reducer, action, store in Redux
8. What is middleware in Redux
9. Explain data flow in Redux
10. What is Redux-Thunk
11. What is Redux-Saga, Difference between Redux-thunk and Redux-saga
12. Difference between class component and function component
13. How can we implement componentWillUnmount in function component
14. useEffect,UseState, useMemo.useCallback hooks in Details
15. Explain lifecycle method in React js
16. What is difference between export default and export in React js
17. What is portal in React js
18. What is reconciliation in React js
19. What is useRef in React js
20. What is server side render in React js
21. What is useStrict in React js
22. What is fragment in React js
23. What is react router in React js
24. What is node module in React js
25. What is the default localhost server port in react js.
26. how can we change the local server port
27. What is high order component in React js
28. What is pure component in React js
29. What is difference state and props in React js
30. How to optimize React js app
31. What is difference between React js and Angular js
32. What is prop drilling in React js how to overcome it
33. What is context api in React js
34. What is super, constructor, render function in React js