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Node JS Interview Questions and Answers
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Node JS Interview Questions

If you wish to make a career in Node JS, below are the top Node JS interview questions with answers which will make you interview-ready.

A comprehensive, community-driven list of essential Node js interview questions. Whether you’re a candidate or interviewer, these interview questions will help prepare you for your next Node.js interview ahead of time.

Basic understanding of Node JS

Node js can be used to build different types of applications, such as web applications, real-time chat applications, REST API servers, etc. Nonetheless, it is primarily used to create network programs such as web servers, similar to PHP, Java, or ASP.NET. Node js was created in 2009 by Ryan Dahl.

Node js is a run-time JavaScript environment developed on top of the Chrome V8 engine. Uses an event-driven, non-blocking I / O model. It’s lightweight and it’s so effective. Node js has an architecture module called npm.

Check all 21 questions here

  1. Explain the basics of Node js

  2. What is Event-driven programming?

  3. What is “callback hell” and how can it be avoided?

  4. How does Node JS handle child threads?

  5. What is Event loop in Node JS work? And How does it work?

  6. What is the difference between Asynchronous and Non-blocking?

  7. What is Tracing in Node.js?

  8. Difference between setTimeout(fn,0) vs setImmediate(fn)?

  9. What is process.nextTick()?

  10. What is the preferred method of resolving unhandled exceptions in Node.js?

  11. How does Node.js support multi-processor platforms, and does it fully utilize all processor resources?

  12. What are some of the most popular modules of Node.js?

  13. What is EventEmitter in Node.js?

  14. What are Streams in Node js?

  15. What is typically the first argument passed to a Node JS callback handler?

  16. What is REPL? What purpose it is used for?

  17. What is the difference between readFile vs createReadStream in Node.js?

  18. What's a crypt in Node js? How do you Cipher the protected information in Node.js?

  19. What is the use of DNS module in Node.js?

  20. What is a Callback function in Node.js?

  21. What is the passport in Node.js?

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