NodeJs Interview Questions

Introduction

Node.js is a web application framework and server-side scripting which is used to build scalable programs. It is built on Google Chromes’s Javascript Engine. Moreover, to run it on Mac OS, Windows, and Linux, we need Node.js runtime with no changes. As a result, it facilitates the user to execute a Javascript code on any machine outside the browser.

This article will provide you top 100 questions to crack the interview rounds having questions on Node.js.

Basic Level Interview Questions

  1. What do you know about Node.js?
  2. Is Node.js free to use?
  3. Is it a single-threaded application?
  4. What is the main role of Node.js?
  5. Give me an example of real-time web applications developed using Node.js?
  6. List some advantages of Node.js?
  7. Explain the architecture of Node.js?
  8. How will you relate Distributed systems with Node.js?
  9. Explain the structure of the data link layer?
  10. What does the term I/O represent?
  11. Name the various types of API functions present in Node.js?
  12. What are Blocking and Non-Blocking functions?
  13. Explain the first-class function in Javascript>
  14. Highlight some differences between Javascript and Node.js?
  15. Which is more capable in HTML compatibility- Javascript or Node.js?
  16. Explain the working process of Node.js?
  17. Describe your approach to managing the packages in the Node.js project?
  18. What is the reason behind the single-threaded property of Node.js?
  19. Explain callback hell in Node.js?
  20. Compare Node.js with other popular frameworks?
  21. Why Node.js is better than other popular frameworks?
  22. What type of applications are developed using Node.js?
  23. Explain some commonly used timing features of Node.js?
  24. Define the ‘nextTick’ feature of Node.js?
  25. Explain the term fork in Node.js?
  26. Name the best tool that users can use for consistent code style in Node.js?
  27. Compare and contrast front-end and back-end development?
  28. Give some examples of front-end and back-end development?
  29. Do you know the use of async-await in Node.js?
  30. Name the different modules of front-end and back-end development?
  31. What are buffers in Node.js?
  32. Explain error-first callback?
  33. What do you know about asynchronous API?
  34. What are various techniques to avoid callbacks?
  35. Does Node.js provide a debugger?
  36. What is a control flow function?
  37. Explain how ‘Control Flow’ controls the function calls?
  38. Does Node.js supports DOM or is it possible to access DOM in Node.js?
  39. What are various tasks that are done asynchronously using an event loop?
  40. Explain REPL in Node.js?
  41. What does the term REPL represent in Node?
  42. Explain read, Eval, Print, and Loop tasks in Node?
  43. Does REPL help in evaluating simple expressions?
  44. Explain the use of the underscore variable in REPL?
  45. Does Node.js support cryptography?
  46. Define Node Package Manager?
  47. What are the main functions of npm?
  48. Differentiate between operational and programmer errors?
  49. What are the differences between the global installation of dependencies and the local installation of dependencies?
  50. Explain the use of buffer class in Node.js?
  51. Explain the role of assert in Node.js?
  52. Explain how will you truncate a file using Node?
  53. What are the various streams available in Node.js?
  54. Explain the Duplex stream?
  55. What is the process of creating a directory using Node?
  56. Explain the purpose of the _filename variable?
  57. Explain the concept of event-driven programming in Node.js?
  58. Differentiate between events and callbacks in Node.js?
  59. Explain Punycode in Node.js?
  60. What does the Node.js TTY module contain?
  61. Highlight some key differences between Angular and Node.js?
  62. What is more complicated- Angular or Node.js?
  63. Compare and contrast operational and programmer errors?
  64. Explain EventEmitter in Node.js?
  65. Differentiate between readFile and createReadStream in Node.js?
  66. How will you use clustering techniques to enhance the performance of Node.js?
  67. Name various Cluster managers?
  68. Explain thread pool in Node.js?
  69. Name the library that handles thread pool in Node.js?
  70. In which languages Node.js is written?
  71. Which one will you use to create highly active and interactive web pages- Angular or Node.js?
  72. How will you fetch information about a file using Node?
  73. What are JSLint, JSHint, ESLint?
  74. Have you ever developed and Network application using Node.js?

Advanced level Interview Questions

  1. How will you connect a MongoDB database to Node.js?
  2. Name the different types of HTTP requests used to perform various actions?
  3. Explain the concept of middleware in Node.js?
  4. Define Node.js exit codes?
  5. Google uses the VB engine for Node.js. Why?
  6. What do you know about the test pyramid in Node.js?
  7. Explain reactor pattern in Node.js?
  8. How will you open a file in Node.js?
  9. Name the flags used in read/write operations in files?
  10. Explain piping in Node.js?
  11. Highlight some differences between fork() and spawn() methods in Node.js?
  12. Explain the control flow function?
  13. Create a simple server in Node.js that returns hello world?
  14. How will install, update and delete a dependency?
  15. Create a simple Express.js application?
  16. What is the Express.js package?
  17. How will you use a URL module in Node.js?
  18. Explain the package.json file?
  19. Differentiate between process.nextTick() and setImmediate()?
  20. Name the command used to import external libraries?
  21. Illustrate the purpose of the process object?
  22. How will you delete a directory in Node.js?
  23. Explain the clearTimeout function?
  24. Name the most preferred method used in resolving unhandled exceptions in Node.js?
  25. Name the first argument that is passed in the Node.js callback handler?
  26. Explain how Node.js handles child threads?
  27. Does Node.js support multi-processor platforms?
  28. Does Node.js utilize all processor resources?

 

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