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React JS Interview Questions and Answers | Frontend Developer Interview Preparation

Are you preparing for a React JS interview? 🚀 This video covers the Top 25 React JS Interview Questions and Answers that every frontend and full-stack developer must know. From core concepts like JSX, Virtual DOM, and Components to advanced topics like Hooks, Context API, Performance Optimization, and Error Boundaries, this guide will help you boost your confidence and ace your next interview.

Whether you’re a beginner looking to land your first React job or an experienced developer brushing up on advanced concepts, these questions are carefully curated to match what recruiters and tech companies actually ask.

👉 In this video, you will learn:

Most commonly asked React JS interview questions

Detailed and clear answers with examples

Tips to explain React concepts effectively in interviews

If you’re serious about becoming a React Developer, make sure to watch until the end and take notes.

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1. What is React JS?
2. What are the key features of React?
3. What is JSX?
4. What is the Virtual DOM?
5. What are components in React?
6. What is the difference between a functional component and a class component in React?
7. What are React Hooks?
8. What is useState in React?
9. What are Custom Hooks?
10. What is the difference between Props and State?
11. Can you explain the lifecycle methods of a React component?
12. How do you manage state in React applications?
13. What is the purpose of keys in React lists?
14. How do you optimize the performance of a React app?
15. Can you explain the concept of Higher-Order Components (HOCs)?
16. How do you handle side effects in React apps?
17. What is the Context API and when would you use it?
18. How do you handle forms and form validation in React?
19. What is Reconciliation in React?
20. What are Error Boundaries in React?
21. How do you handle routing in a React application?
22. Can you explain code splitting and its benefits?
23. What are React Fragments?
24. What is Lifting State Up in React?
25. How do you ensure accessibility in React applications?