{"id":10060,"date":"2023-04-29T11:54:07","date_gmt":"2023-04-29T11:54:07","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10060"},"modified":"2023-06-19T13:30:23","modified_gmt":"2023-06-19T13:30:23","slug":"top-50-node-js-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-node-js-interview-questions-with-answers\/","title":{"rendered":"Top 50 Node.Js Interview Questions with Answers"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/04\/image-18.png\" alt=\"\" class=\"wp-image-10061\" width=\"720\" height=\"360\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/04\/image-18.png 800w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/04\/image-18-300x150.png 300w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/04\/image-18-768x384.png 768w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\"><strong><em>Node.Js Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">1. What is Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A programming language<br>b. A web server<br>c. A runtime environment for JavaScript<br>d. A database management system<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. Which event loop does Node.js use?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. Non-blocking<br>b. Blocking<br>c. Sequential<br>d. Parallel<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">3. What is the purpose of the Node.js modules?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create reusable code<br>b. To import JavaScript libraries<br>c. To add new features to Node.js<br>d. To improve Node.js performance<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">4. What is callback hell?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. When a function calls itself recursively<br>b. When too many callbacks are nested within one another<br>c. When a callback function returns an error<br>d. When a callback function takes too long to execute<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">5. What is the purpose of the Node.js package.json file?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To store metadata about the project<br>b. To store the project\u2019s source code<br>c. To store the project\u2019s dependencies<br>d. To store the project\u2019s configuration settings<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">6. What is NPM?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. Node Package Manager<br>b. Node Programming Module<br>c. Node Project Manager<br>d. Node Package Module<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">7. How can you install a Node.js module using NPM?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. npm install module-name<br>b. node install module-name<br>c. module-name install npm<br>d. install npm module-name<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">8. What is a buffer in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A temporary storage area for data<br>b. A data type used to represent binary data<br>c. A function used to read and write files<br>d. An object used to create streams<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">9. What is middleware in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A function that is executed before processing a request<br>b. A function that is executed after processing a request<br>c. A function that is executed between two other functions<br>d. A function that is executed when an error occurs<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">10. What is the purpose of the Node.js http module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To create and manage web servers<br>c. To send emails<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">11. Which HTTP method is used to update a resource?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. GET<br>b. POST<br>c. PUT<br>d. DELETE<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">12. What is the difference between res.send() and res.end() methods in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. res.send() sends JSON data, while res.end() sends plain text<br>b. res.send() sends plain text, while res.end() sends JSON data<br>c. res.send() terminates the response, while res.end() does not<br>d. res.send() and res.end() are interchangeable<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">13. What is an EventEmitter in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A function that listens for events<br>b. An object that emits events<br>c. A method that triggers an event<br>d. A module that handles events<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">14. What is the purpose of the fs module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To send emails<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">15. What is a route in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A path to a file<br>b. A URL endpoint<br>c. A function that handles a specific HTTP request<br>d. A function that handles a specific HTTP response<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">16. What is Express.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A library for building web applications in Node.js<br>b. A Node.js module for handling HTTP requests and responses<br>c. An object-oriented programming language<br>d. A database management system<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">17. What is Mongoose?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A Node.js module for working with MongoDB<br>b. A Node.js module for working with MySQL<br>c. A web server framework for Node.js<br>d. A front-end framework for Node.js<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">18. What is the difference between MongoDB and MySQL?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. MongoDB is a document-oriented database, while MySQL is a relational database<br>b. MongoDB is open source, while MySQL is not<br>c. MongoDB is faster than MySQL<br>d. MySQL is more scalable than MongoDB<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">19. What is the purpose of the cluster module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create multiple child processes of a Node.js application<br>b. To create a cluster of web servers<br>c. To manage user sessions<br>d. To handle database connections<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">20. What is the purpose of the bcrypt module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To encrypt and decrypt data<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">21. What is the purpose of the Node.js net module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To handle TCP connections<br>c. To send emails<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">22. What is the purpose of the forever module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To continuously run a Node.js application<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">23. What is the purpose of the Node.js child_process module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage child processes<br>c. To handle HTTP requests and responses<br>d. To manage user sessions<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">24. What is a stream in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A data type used to represent binary data<br>b. A buffer that is read or written to sequentially<br>c. A function that processes data asynchronously<br>d. An object that is used to create streams<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">25. What is the purpose of the Node.js util module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To provide utility functions<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">26. What is a Readable stream in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A stream that can only be read from<br>b. A stream that can only be written to<br>c. A stream that can be both read from and written to<br>d. A stream that is used to read and write files<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">27. What is a Writable stream in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A stream that can only be read from<br>b. A stream that can only be written to<br>c. A stream that can be both read from and written to<br>d. A stream that is used to read and write files<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">28. What is the purpose of the os module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To interact with the operating system<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">29. What is the purpose of the http-proxy module in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To create and manage web servers<br>c. To proxy HTTP requests to other servers<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">30. What is the purpose of the Node.js crypto module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To encrypt and decrypt data<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">31. What is the purpose of the Node.js path module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To provide utility functions for working with file paths<br>b. To create and manage web servers<br>c. To handle HTTP requests and responses<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">32. What is the purpose of the Node.js url module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To handle HTTP requests and responses<br>c. To parse and format URLs<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">33. What is the purpose of the Node.js zlib module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To compress and decompress data<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">34. What is the purpose of the Node.js cluster module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage child processes of a Node.js application<br>b. To create a cluster of web servers<br>c. To handle database connections<br>d. To handle user authentication and authorization<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">35. What is a Promise in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A function that is executed before processing a request<br>b. An object that represents the eventual completion of an asynchronous operation<br>c. A method that triggers an event<br>d. A method that handles rejected Promises<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">36. What is the purpose of the Node.js assert module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To create and manage web servers<br>c. To write unit tests for Node.js applications<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">37. What is the purpose of the Node.js debug module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To handle database connections<br>c. To improve the debugging capabilities of Node.js<br>d. To handle file system operations<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">38. What is the purpose of the Node.js dgram module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To handle datagram sockets<br>c. To create and manage web servers<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">39. What is the purpose of the Node.js punycode module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To encode and decode domain names<br>b. To create and manage web servers<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">40. What is the purpose of the Node.js q module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To provide a simple and powerful promise-based API<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">41. What is the purpose of the Node.js request module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To create and manage web servers<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">42. What is the purpose of the Node.js sinon module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To improve the testing capabilities of Node.js<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">43. What is a duplex stream in Node.js?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. A stream that can only be read from<br>b. A stream that can only be written to<br>c. A stream that can be both read from and written to<br>d. A stream that is used to read and write files<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">44. What is the purpose of the Node.js tty module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle HTTP requests and responses<br>b. To create and manage web servers<br>c. To interact with the terminal<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">45. What is the purpose of the Node.js zlib-sync module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To compress and decompress data synchronously<br>c. To handle HTTP requests and responses<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">46. What is the purpose of the Node.js async module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To provide a simple and powerful promise-based API<br>b. To handle file system operations<br>c. To create and manage web servers<br>d. To provide utility functions for working with asynchronous code<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">47. What is the purpose of the Node.js strong-agent module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage web servers<br>b. To improve the performance of Node.js applications<br>c. To handle file system operations<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">48. What is the purpose of the Node.js chokidar module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To watch files and directories for changes<br>b. To create and manage web servers<br>c. To handle HTTP requests and responses<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">49. What is the purpose of the Node.js fs-extra module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To handle file system operations<br>b. To create and manage web servers<br>c. To handle HTTP requests and responses<br>d. To connect to a database<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">50. What is the purpose of the Node.js clusterize module?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">a. To create and manage child processes of a Node.js application<br>b. To improve the scalability of a Node.js application<br>c. To handle database connections<br>d. To handle user authentication and authorization<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>1. What is Node.js? a. A programming languageb. A web serverc. A runtime environment for JavaScriptd. A database management system [&hellip;]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[6060],"tags":[],"class_list":["post-10060","post","type-post","status-publish","format-standard","hentry","category-node-js"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top 50 Node.Js Interview Questions with Answers - scmGalaxy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-node-js-interview-questions-with-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 50 Node.Js Interview Questions with Answers - scmGalaxy\" \/>\n<meta property=\"og:description\" content=\"1. What is Node.js? a. A programming languageb. A web serverc. A runtime environment for JavaScriptd. 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