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25+ NodeJs Interview Questions


NodeJs Interview Questions:

  1. What is the first-class function in Javascript?
  2. If Node.js is single-threaded then how does it handle concurrency?
  3. Differentiate between process.nextTick() and setImmediate()?
  4. How can we use async await in node.js?
  5. Explain what a Reactor Pattern is in Node.js?
  6. What is the purpose of the module, exports?
  7. What tools can be used to assure consistent code style?
  8. What do you understand by callback hell?
  9. How do you manage packages in your node.js project?
  10. How is Node.js better than other frameworks most popularly used?
  11. Explain the steps of how “Control Flow” controls the function calls.
  12. What are some commonly used timing features of Node.js?
  13. What are node.js buffers?
  14. How does Node.js overcome the problem of blocking I/O operations?
  15. What are the pros and cons of Node.js?
  16. What is Node.js and how it works?
  17. How do you create a simple server in Node.js that returns Hello World?
  18. What is a fork in node JS?
  19. How many types of API functions are there in Node.js?
  20. What is REPL?
  21. What is middleware?
  22. What are the advantages of using promises instead of callbacks?
  23. Why is Node.js single-threaded?
  24. List down the two arguments that async. Does the queue take as input?
  25. What is an event-loop in Node JS?
  26. What are node.js streams?