Top 20 React JS Interview Questions For 2025 | React Interviewer Questions & Answers | Intellipaat

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Getting ready for a React.js interview in 2025? 🚀 This video covers the Top 20 React.js Interview Questions along with in-depth answers to help you excel in your preparation. Whether you're a fresher or a seasoned developer, this guide is tailored to address all levels, diving into core React.js fundamentals, lifecycle methods, React hooks, and advanced concepts like state management, Redux, and Context API.

💡 What’s Covered in This Video?
🚀 Essential React.js Interview Questions And Answers for freshers.
🚀 Important React Interview Questions And Answers for Experienced Professionals.
🚀Advanced React Concepts like error boundaries and performance optimization.
🚀 Coding practices and examples for real-world problem-solving.
🚀Insights into recruiter expectations and how to ace technical rounds.

👉 Why Watch This React Interview Preparation Video?
With React.js being a top choice for web development in 2025, staying prepared with the right knowledge and hands-on expertise can set you apart. This video simplifies complex concepts and ensures you’re interview-ready.

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📖 Below are the questions covered in the video on 'Top 20 React.js Interview Questions':

🥇00:00 - Introduction to React.JS Interview Questions And Answers

👨‍💻 React Interview Questions for Freshers:
01:20 - Q.1 What is React?
01:50 - Q.2 What is an SPA?
02:35 - Q.3 What is JSX, and how is it different from HTML?
03:14 - Q.4 Difference between functional and class components?
04:09 - Q.5 Difference between stateless and stateful components?
04:50 - Q.6 What are props in React?
05:22 - Q.7 Difference between state and props in React?
05:58 - Q.8 What are controlled vs. uncontrolled components?
06:47 - Q.9 What is the purpose of the key attribute in React lists?
07:25 - Q.10 What are fragments in React?

👨‍💻 Intermediate Level React Questions For Interview (React Coding Interview Questions):
07:50 - Q.11 What is the Virtual DOM?
10:10 - Q.12 What are React lifecycle methods?
14:45 - Q.13 Explain the useState and useEffect hooks.
21:17 - Q.14 What is props drilling in React?

👨‍💻 Advanced React Interview Questions and Answers:
26:33 - Q.15 What is the Context API?
32:36 - Q.16 What are HOCs?
41:01 - Q.17 Reconciliation in React.
42:44 - Q.18 Explain React Portals.
48:23 - Q.19 How does React Router handle navigation in a single-page app?
52:35 - Q.20 Explain React strict mode.

❓What are the common React.js interview questions?
Questions often include React lifecycle methods, React hooks, virtual DOM, state management, and optimization techniques.

❓How can I prepare for React.js interviews in 2025?
Review React fundamentals, practice coding challenges, and dive into topics like Context API, Redux, and error boundaries.

❓What are React.js questions for freshers?
Freshers should expect questions on JSX, props vs. state, functional vs. class components, and rendering techniques.

❓What should experienced developers know for React.js interviews?
Be ready to discuss performance optimizations, design patterns, debugging, and scaling React applications.

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