This content originally appeared on DEV Community and was authored by Yogesh Chavan
Are you gearing up for a React.js/Next.js interview and want to stand out from the crowd? Whether you're a fresher aiming for your first role or an experienced developer seeking to sharpen your expertise, mastering React.js/Next.js is essential to your success in today's tech landscape.
This comprehensive guide covers 100+ React.js + Next.js interview questions — each paired with detailed answers and practical insights — designed to help you confidently tackle any interview scenario.
Dive in to discover everything from fundamental concepts to advanced patterns, and equip yourself with the real-world knowledge you need to impress employers and accelerate your career in modern web development.
React.js Questions
1. What is useRef and when would you use it?
2. Explain code splitting and lazy loading in React
3. What will happen in this code?
4. What causes unnecessary re-renders and how do you prevent them?
5. What is Reconciliation in React?
6. What is React Fiber?
7. What is forwardRef?
8. What are Fragments and why use them?
9. What is the Container/Presentational pattern?
10. What are some React best practices?
11. What is a race condition and how do you prevent it?
12. What is useReducer hook and when should you use it?
13. How do you type hooks with TypeScript?
14. What's wrong with this code?
15. Why does this component render infinitely?
Next.js Questions
1. What's the difference between searchParams and params in page props?
2. What's wrong with this environment variable usage?
3. Why doesn't this cookie update work?
4. Why does this cause request timeout?
5. What's wrong with this Link prefetch behavior?
6. What's the purpose of the Image component’s priority prop?
7. What's wrong with this Server Action?
8. What's the difference between next build and next build --profile?
9. Why does this component cause a hydration error?
10. What happens when you export this config?
11. How do you handle errors in the app directory?
12. What's the issue with this Server Action form?
13. Why doesn’t this middleware redirect work?
14. What's the purpose of generateStaticParams?
15. How do you implement Incremental Static Regeneration (ISR) in Next.js 13+?
These were just a few sample questions and answers from the Next.js + React.js Interview Questions eBook.
Download them as a PDF and access all 100+ questions.
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This content originally appeared on DEV Community and was authored by Yogesh Chavan
Yogesh Chavan | Sciencx (2025-10-18T10:19:55+00:00) 100+ React.js And Next.js Interview Questions With Answers. Retrieved from https://www.scien.cx/2025/10/18/100-react-js-and-next-js-interview-questions-with-answers/
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