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🔥 Full Stack Developer - MERN Stack: https://www.simplilearn.com/full-stack-developer-course-mern-certification-training?utm_campaign=3xYvE3fqb14&utm_medium=DescriptionFirstFold&utm_source=youtube 🔥 Full Stack Java Developer - https://www.simplilearn.com/java-full-stack-developer-certification?utm_campaign=3xYvE3fqb14&utm_medium=DescriptionFF&utm_source=youtube 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? ✅ Subscribe to our Channel to learn more about the top Technologies: https://bit.ly/2VT4WtH #Node JSInterviewQuestionsAndAnswer #backendDevelopment #FrontEndDevelopment #softwaredevelopment #softwareengineer #simplilearn ➡️ About Full Stack Java Developer Program This Java Full Stack Developer course is designed to introduce you to front-end, middleware, and back-end Java web development technologies. You will learn to build an end-to-end application, test and deploy code, store data using MongoDB, and much more. ✅ Key Features Simplilearn's JobAssist helps you get noticed by top hiring companies Kickstart Full Stack Java Developer career with industry-aligned curriculum by experts Hands-on practice through 20+ projects, assessments, and tests Learn cutting edge frameworks like React, Springboot, and many more Live interaction and applied learning with industry expert trainers Practice hands - on learning with Capstone Projects across 4 domains ✅ Skills Covered Agile Git SQL Core Java Spring Spring Boot Node JS and CSS AWS Docker Jenkins Node JS ReactJS Cucumber Maven JSP JDBC MongoDB JUnit ✅ Enroll Now: https://www.simplilearn.com/full-stack-developer-course-mern-certification-training?utm_campaign=3xYvE3fqb14&utm_medium=Description&utm_source=youtube