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NodeJS Interview Questions
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| S. No | Questions |
| 01. | What does the runtime environment mean in Node.js? |
| 02. | What is Node.js? |
| 03. | What is Node.js Process Model? |
| 04. | What are the data types in Node.js? |
| 05. | How to create a simple server in Node.js that returns Hello World? |
| 06. | How do Node.js works? |
| 07. | What is an error-first callback? |
| 08. | What is callback hell in Node.js? |
| 09. | What are Promises in Node.js? |
| 10. | What tools can be used to assure consistent style? |
| 11. | When should you npm and when yarn? |
| 12. | What is a stub? |
| 13. | What is a test pyramid? How can you implement it when talking about HTTP APIs? |
| 14. | How can you secure your HTTP cookies against XSS attacks? |
| 15. | How can you make sure your dependencies are safe? |
| 16. | What is Event loop in Node.js? How does it work? |
| 17. | What is REPL? What purpose it is used for? |
| 18. | What is the difference between Asynchronous and Non-blocking? |
| 19. | How to debug an application in Node.js? |
| 20. | What are some of the most popular packages of Node.js? |
| 21. | What is EventEmitter in Node.js? |
| 22. | How many types of streams are present in node.js? |
| 23. | What is crypto in Node.js? How do you cipher the secure information in Node.js? |
| 24. | What is the use of DNS module in Node.js? |
| 25. | What are the security mechanisms available in Node.js? |
| 26. | Name the types of API functions in Node.js. |
| 27. | How does Node.js handle child threads? |
| 28. | What is the preferred method of resolving unhandled exceptions in Node.js? |
| 29. | How does Node.js support multi-processor platforms, and does it fully utilize all processor resources? |
| 30. | What is typically the first argument passed to a Node.js callback handler? |
| 31. | How Node.js read the content of a file? |
| 32. | What is JIT and how is it related to Node.js? |
| 33. | What is difference between put and patch? |
| 34. | List types of Http requests supported by Node.js. |
| 35. | Why to use Express.js? |
| 36. | Write the steps for setting up an Express JS application. |
| 37. | Since node is a single threaded process, how to make use of all CPUs? |
| 38. | What does emitter do and what is dispatcher? |
| 39. | How to kill child processes that spawn their own child processes in Node.js? |
| 40. | What do you understand by Reactor Pattern in Node.js? |
| 41. | What are the key features of Node.js? |
| 42. | What are globals in Node.js? |
| 43. | What is chaining process in Node.js? |
| 44. | What is a control flow function? what are the steps does it execute? |
| 45. | What is npm in Node.js? |
| 46. | When to use Node.js and when not to use it? |
| 47. | Explain how does Node.js work? |
| 48. | Is Node.js entirely based on a single-thread? |
| 49. | How to make post request in Node.js? |
| 50. | Can you create http server in Node.js, explain the code used for it? |
| 51. | How to load html in Node.js? |
| 52. | How can you listen on port 80 with Node? |
| 53. | What is the difference between operational and programmer errors? |
| 54. | Why npm shrinkwrap is useful? |
| 55. | What is your favourite HTTP framework and why? |
| 56. | What are the Challenges with Node.js? |
| 57. | What is the difference between Node.js vs Ajax? |
| 58. | How Node.js overcomes the problem of blocking of I/O operations? |
| 59. | Mention the steps by which you can async in Node.js? |
| 60. | What are the timing features of Node.js? |
| 61. | What is LTS releases of Node.js why should you care? |
| 62. | Why should you separate Express 'app' and 'server'? |
| 63. | What is the difference between process.nextTick() and setImmediate()? |
| 64. | What is difference between JavaScript and Node.js? |
| 65. | What are the difference between Events and Callbacks? |
| 66. | Explain RESTful Web Services in Node.js? |
| 67. | How to handle file upload in Node js? |
| 68. | Explain the terms body-parser, cookie-parser, debug, jade, morgan, nodemon, pm2, serve-favicon, cors in Express JS? |
| 69. | How does routing work in Node.js |
| 70. | How Node prevents blocking code? |
| 71. | What is difference between promise and async await in node js? |
| 72. | How to use JSON Web Token (JWT) for authentication in node js? |
| 73. | How to build a microservices architecture with node js? |
| 74. | How to use Q promise in node js? |
| 75. | How to use locale (i18n) in node js? |
| 76. | How to Implement Memcached in Nodejs? |
| 77. | Explain Error Handling approaches in Nodejs? |
| 78. | How to generate and verify checksum of the given string in Nodejs |
| 79. | What is Callback function in node.js? |
| 80. | What is asynchronous programming in node.js? |
| 81. | How to implement asymmetric cryptography when signing and verify JSON Web Token (JWT) for authentication in node js? |