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In this video, we bring you the Top 30 Node.js Interview Questions and Answers to help you prepare confidently for your next interview. Whether you’re a beginner learning Node.js or an experienced developer brushing up on key concepts, this video covers it all — from event loops, callbacks, and middleware to streams, clusters, and more. Watch till the end to get clear explanations, helpful examples, and expert insights that will make you interview-ready. Perfect for anyone aiming to land a Node.js developer job in 2025!

00:00:00 - Introduction to Node.JS Interview Questions and Answers
00:02:41 - Basic Level Interview Questions and Answers
00:02:51 - 1. What is Node.js?
00:03:21 - 2. What’s the difference between Node.js and JavaScript?
00:04:29 - 3. How does Node.js work internally?
00:04:56 - 4. Why is Node.js single-threaded?
00:05:23 - 5. Why is Node.js popular today?
00:05:56 - 6. How to write a simple ‘Hello World’ server in Node.js?
00:06:50 - 7. What is synchronous vs asynchronous programming?
00:07:20 - 8. How does Node.js achieve asynchronous programming?
00:07:47 - 9. What is the event loop and how does it manage requests?
00:08:14 - 10. What is callback hell and how can you avoid it?
00:08:49 - Intermediate Level Interview Questions and Answers
00:09:00 - 11. What are Promises in Node.js?
00:09:32 - 12. How does async/await improve asynchronous code?
00:10:02 - 13. What is package.json and why is it important?
00:10:37 - 14. Name five built-in modules of Node.js.
00:11:06 - 15. What is middleware in Node.js?
00:11:46 - 16. What is module.exports and how is it used?
00:12:16 - 17. What’s the difference between Express.js and Node.js?
00:13:17 - 18. What is event-driven programming in Node.js?
00:13:45 - 19. What role does the events module play?
00:14:10 - 20. What is the Buffer class and why is it used?
00:14:46 - Advanced Level Interview Questions and Answers
00:15:14 - 21. Compare setImmediate() vs setTimeout().
00:15:40 - 22. Explain Node.js web application architecture.
00:16:34 - 23. What are the types of streams in Node.js?
00:17:09 - 24. What is the purpose of the createServer() method?
00:17:34 - 25. Name commonly used libraries in Node.js projects.
00:18:08 - 26. What is clustering in Node.js, and how does it improve performance?
00:18:42 - 27. How do you handle heavy CPU-bound tasks without blocking the event loop?
00:19:20 - 28. How do you secure Node.js applications from common vulnerabilities?
00:20:08 - 29. How do you optimize the performance of Node.js applications for production?
00:20:43 - 30. How can you ensure scalability and maintainability in Node.js APIs?

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