React Interview Questions 2025 | Top 15 Q&A for MERN Stack & Frontend Developers

Prepare for your next Frontend or Full-Stack Developer interview with these Top 15 React Interview Questions and Answers (2025 Edition)! This video will help you quickly understand essential React concepts, with simple explanations and practical examples. Whether you’re applying for a Frontend Developer, MERN Stack Developer, or JavaScript Engineer role, you’ll get clear insights you can confidently share in interviews. --------------------------------------------------------------------------------------------- ⏱️ Timestamps & Topics Covered: 00:00 – Introduction 00:15 – What is React and its key features? 02:33 – What is JSX and how does it work? 04:58 – What is the Virtual DOM? 06:04 – How does the Virtual DOM work (benefits & drawbacks)? 06:48 – React Node vs React Element vs React Component – what’s the difference? 09:10 – What are React Fragments and why use them? 10:32 – Why is the key prop important in lists? 12:29 – What are Events in React.js? 13:46 – Props vs State – how are they different? 14:50 – Class Components vs Functional Components – full comparison 16:14 – What is React Fiber? 17:02 – What is reconciliation in React? 17:29 – Virtual DOM vs Shadow DOM – key differences 18:13 – Controlled vs Uncontrolled Components – with examples 19:06 – Overview of common React Hooks (useState, useEffect, useRef) 21:21 – What’s next...? ------------------------------------------------------------------------------------------ 🎯 Keywords : React interview questions, React JS 2025, MERN stack interview prep, frontend developer interview, React Hooks explained, JSX vs Virtual DOM, React Fiber tutorial, controlled vs uncontrolled components, React for beginners, React vs Angular comparison, modern React concepts --------------------------------------------------------------------------------------------- 👍 Like, comment, and subscribe for more developer interview prep videos! https://youtube.com/@knowthewhy-18?si=Z_Z5gA9eOGsAoLan 💬 Have questions or need more examples? Drop them in the comments—I’d love to help you out! 📺 Watch Next: 🔗 https://youtu.be/4VP3SpBmA_4 🔗 https://youtu.be/bJSn7UV1P9E 🔗 https://youtu.be/h7VQGB1TyGk