Node.js Interview Questions to Crack Your Next Interview

If you're preparing for a Node.js interview, here are some key questions you should be ready to answer:

1. What is Node.js? Where can you use it?
2. Why use Node.js?
3. How does Node.js work?
4. Why is Node.js single-threaded?
5. If Node.js is single-threaded, then how does it handle concurrency?
6. Explain callback in Node.js.
7. What are the advantages of using promises instead of callbacks?
8. How would you define the term I/O?
9. How is Node.js most frequently used?
10. Explain the difference between frontend and backend development.
11. What is NPM?
12. What are the modules in Node.js?
13. What is the purpose of the `module.exports`?
14. Why is Node.js preferred over other backend technologies like Java and PHP?
15. What is the difference between Angular and Node.js?
16. Which database is more popularly used with Node.js?
17. What are some of the most commonly used libraries in Node.js?
18. What are the pros and cons of Node.js?
19. What is the command used to import external libraries?
20. What does event-driven programming mean?
21. What is an Event Loop in Node.js?
22. Differentiate between `process.nextTick()` and `setImmediate()`.
23. What is an EventEmitter in Node.js?
24. What are the two types of API functions in Node.js?
25. What is the `package.json` file?
26. How would you use a URL module in Node.js?
27. What is the Express.js package?
28. How do you create a simple Express.js application?
29. What are streams in Node.js?
30. How do you install, update, and delete a dependency?
31. How do you create a simple server in Node.js that returns "Hello World"?
32. Explain asynchronous and non-blocking APIs in Node.js.
33. How do we implement async in Node.js?
34. What is a callback function in Node.js?
35. What is REPL in Node.js?
36. What is the control flow function?
37. How does control flow manage the function calls?
38. What is the difference between `fork()` and `spawn()` methods in Node.js?
39. What is the buffer class in Node.js?
40. What is piping in Node.js?
41. What are some of the flags used in read/write operations in files?
42. How do you open a file in Node.js?
43. What is callback hell?
44. What is a reactor pattern in Node.js?
45. What is a test pyramid in Node.js?
46. For Node.js, why does Google use the V8 engine?
47. Describe Node.js exit codes.
48. Explain the concept of middleware in Node.js.
49. What are the different types of HTTP requests?
50. How would you connect a MongoDB database to Node.js?
51. What is the purpose of NODE_ENV?
52. List the various Node.js timing features.
53. What is WASI, and why is it being introduced?

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