{"id":3287,"date":"2020-08-26T10:20:00","date_gmt":"2020-08-26T10:20:00","guid":{"rendered":"https:\/\/www.digitalogy.co\/blog\/?p=3287"},"modified":"2024-07-19T07:39:34","modified_gmt":"2024-07-19T07:39:34","slug":"node-js-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.digitalogy.co\/blog\/node-js-interview-questions-and-answers\/","title":{"rendered":"List Of The Top 25 Node.JS Interview Questions and Answers"},"content":{"rendered":"<p class=\"graf graf--p\">Of late everyone\u2019s been talking about <a href=\"https:\/\/nodejs.org\/en\/\" target=\"_blank\" rel=\"noopener nofollow noreferrer\"><strong>Node.Js<\/strong> <\/a>and aspires to learn it because the trends of web development seem to be heading its way. The infrastructure of sites like <strong>LinkedIn, eBay, and PayPal<\/strong> is <strong>based on Node.Js<\/strong>. It allows you to mold your application according to your requirements. No doubt it\u2019s <strong>becoming widely accepted<\/strong> these days! Are you planning to go for an interview on Node.Js and anxious about the questions that might arise during the interview! Don\u2019t worry a bit; we have specially designed the topmost Node.js interview questions and answers to get you accustomed to the variety of questions that you may witness during your respective interviews.<\/p>\n<h2><strong>Frequently Asked Node.JS Interview Questions and Answers<\/strong><\/h2>\n<p>In this section, you will encounter a long list of Node.js questions and answers, specifically curated for aspiring <a href=\"https:\/\/www.digitalogy.co\/hire-nodejs-developers\">Node.js developers<\/a>. We hope that these questions will aid you in answering confidently in your anticipated interviews and advancing your career as a Node.js developer.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is Node.Js and where can it be used?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">It is an <strong>open-source server environment<\/strong> and is built on <strong>Google Chrome\u2019s JavaScript Engine (<a href=\"https:\/\/v8.dev\/\" target=\"_blank\" rel=\"noopener nofollow noreferrer\">V8 Engine)<\/a><\/strong>. The applications of Node.Js are written in <a href=\"https:\/\/www.javascript.com\/\" target=\"_blank\" rel=\"noopener nofollow noreferrer\">JavaScript<\/a> and can run on various platforms like <strong>OS X, Windows, Linux, Unix, Mac, etc.<\/strong>)<\/p>\n<p class=\"graf graf--p\">Node.Js can be used for real-time apps, video conference apps, server-side applications, general-purpose applications, chat servers, network applications, etc.<\/p>\n<p><iframe title=\"What is Node js?\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/uVwtVBpw7RQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>\u00a0Why does Node.Js use Google V8 Engine?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Node.Js uses <strong>Google V8 Engine<\/strong> because Google V8 is a runtime engine of Chrome. It helps in the conversion of JavaScript code into native machine code. This enables the application to run more smoothly and swiftly.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>How does Node.js operate?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Node.js is a virtual machine and primarily works on a V8 environment. Through non-blocking, I\/O and single-threaded loop Node.js is capable of attaining high output.<\/p>\n<ul>\n<li>\n<h4><strong>What is meant by I\/O?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p>The full form of I\/O is <strong>input and output<\/strong>. It can get access to anything that is outside your application. Once the machine starts, it\u2019ll be loaded onto the computer memory to run the program.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>Mention some features of Node.Js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">\u00a0Given below are the most significant features of Node.Js:-<\/p>\n<ol>\n<li class=\"graf graf--p\"><strong>High Speed &#8211; <\/strong>The library of Node.Js is very fast and accurate in the execution of code because Node.Js is built on Google Chrome\u2019s V8 JavaScript Engine.<\/li>\n<li class=\"graf graf--p\"><strong>Single-threaded &#8211;<\/strong> Along with event looping it follows a single-threaded model.<\/li>\n<li class=\"graf graf--p\"><strong>License &#8211; <\/strong>Node.Js has been released under the MIT license.<\/li>\n<li class=\"graf graf--p\"><strong>No buffering &#8211; <\/strong>Node.js cuts down the processing time significantly while uploading audio and video files. There is no buffering of data.<\/li>\n<li class=\"graf graf--p\"><strong>Highly scalable &#8211; <\/strong>Node.js follows an event mechanism that makes it feasible for the server to respond in a non-blocking manner which ultimately makes it scalable.<\/li>\n<li class=\"graf graf--p\"><strong>Asynchronous\u200a \u2014\u200a <\/strong>The server of Node.Js can respond to multiple requests at a particular time without blocking any API request.<\/li>\n<\/ol>\n<ul>\n<li>\n<h4><strong>Which two API functions are used in Node.Js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<ol>\n<li>Synchronous also is known as (blocking functions).<\/li>\n<li>\u00a0Asynchronous also is known as (non-blocking functions)<\/li>\n<\/ol>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is meant by Asynchronous API?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">The APIs of Node.Js library are nonblocking i.e. (asynchronous). They are primarily concerned with the fact that the server doesn\u2019t wait for an API to come back with data rather it moves onto the next API.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is the distinction between asynchronous and nonblocking?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Asynchronous functions continue to react to the request for which it has already received in the server response whereas non-blocking immediately responds with whatever data is available and continues running as per the requests.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>Can you mention some of the IDEs that you can use for Node.js development?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<ol>\n<li class=\"graf graf--p\">Cloud9<\/li>\n<li class=\"graf graf--p\">Jet Brains Web Storm<\/li>\n<li class=\"graf graf--p\">Jet Brains Intel IDEA<\/li>\n<li class=\"graf graf--p\">Komodo IDE<\/li>\n<li class=\"graf graf--p\">Eclipse<\/li>\n<li class=\"graf graf--p\">Atom<\/li>\n<\/ol>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What do you understand by the control flow function?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Control Flow function is primarily concerned with the sequence in which statements or functions are executed.<\/p>\n<ul>\n<li>\n<h4><strong>What do you mean by Callback Hell?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Callback hell refers to a nested callback which is heavily nested. For this reason, it is difficult to read and to maintain.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What are the ways to avoid Callback Hell?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Callback can be avoided by doing the following;-<\/p>\n<ol>\n<li class=\"graf graf--p\">By using promises.<\/li>\n<li class=\"graf graf--p\">By using yield with generators.<\/li>\n<li class=\"graf graf--p\">(Modularization) by breaking callbacks into independent functions<\/li>\n<\/ol>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What are promises in Node.Js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Promises are actions that are either completed or rejected. These are proxy for a value that might not be returned if the function from we expect a response doesn\u2019t deliver.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>Explain REPL in Node.js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">The REPL in Node.Js stands for <strong>\u201cRead Eval Print Loop\u201d<\/strong>. It is a simple program that does the following-<\/p>\n<p class=\"graf graf--p\">\u2022 Accepts the commands<\/p>\n<p class=\"graf graf--p\">\u2022 Evaluates the commands<\/p>\n<p class=\"graf graf--p\">\u2022 Prints the results<\/p>\n<p class=\"graf graf--p\">It provides an environment that is somewhat similar to that of Unix\/Linux shell in which the user can enter the command and the system in return responds with the output.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>Why is consistent style important, and what tools can be used to procure it?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Consistent style is necessary as it helps the team members to make changes in the projects easily without getting accustomed to a new style each time. Tools that can help to assure it are\u200a\u2014<strong>\u200a<a href=\"https:\/\/standardjs.com\/\" target=\"_blank\" rel=\"noopener nofollow noreferrer\">Standard<\/a> and <a href=\"https:\/\/www.npmjs.com\/package\/eslint\" target=\"_blank\" rel=\"noopener nofollow noreferrer\">ESLint<\/a>.<\/strong><\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>Mention the modules that are offered by Node.Js?\u00a0<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Node.Js offers 3 modules;-<\/p>\n<p class=\"graf graf--p\"><strong>1. Third-party modules &#8211;<\/strong> The third-party modules are often referred to as external modules and are created by downloading them through the Node Package Manager.<\/p>\n<p class=\"graf graf--p\"><strong>2. Core Modules &#8211;<\/strong> Usually, these modules get loaded just after the initiation of the Node process.<\/p>\n<p class=\"graf graf--p\"><strong>3. Local Modules &#8211;<\/strong> These are often created locally by the user. The modules may have several functionalities that can be distributed through the Node Package Manager.<\/p>\n<p><iframe title=\"Modules in Node.js\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/9Amxzvq5LY8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is the command which is used to terminate REPL in Node.js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Command\u200a\u2014\u200actrl + c twice is used to terminate REPL.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What structure is commonly utilized in Node.js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p>\u201cExpress\u201d is the most compatible framework which is utilized in Node.js.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>\u00a0Do you think that Node.Js is better than Python for building Real-Time Applications?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Of course, Node JS is far better than python to build real-time applications as \u2013<\/p>\n<ol>\n<li class=\"graf graf--p\">It supports callbacks.<\/li>\n<li class=\"graf graf--p\">It is built upon Chrome\u2019s JavaScript V8 engine (powerful and fast engine).<\/li>\n<\/ol>\n<p><strong>Check Out\u00a0 &#8211;\u00a0<\/strong><a href=\"https:\/\/towardsdatascience.com\/python-vs-node-js-which-one-is-best-for-your-project-e98f2c63f020\">Python vs. Node.JS: Which One is Best for Your Project?<\/a><\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>How will you debug an application in Node.Js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Node.Js already contains a debugging utility called as a debugger. To initiate the debugging you have to start the Node.Js with the debug argument accompanied by the path to the script to debug.<br \/>\nThen you have to insert the statement debugger into the source code of a script. This will enable a breakpoint at that particular position in the code. This is how any application in Node.Js is debugged.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is &lt;Package.Json&gt;?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">&lt;Package.Json&gt;is a plain JavaScript object Notation (JSON) text file. It comprises of the metadata information about Node.Js application.<\/p>\n<p class=\"graf graf--p\">This file should be present in the root directory of every Node.Js module. One is supposed to utilize the same file name with the same case \u201cpackage\u201d and the same file extension \u201c*.json\u201d.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is libuv?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\"><a href=\"https:\/\/github.com\/libuv\/libuv\" target=\"_blank\" rel=\"noopener nofollow noreferrer\">Libuv<\/a> is a multi-platform support library. The main focus of Libuv is on asynchronous I\/O. It is utilized by <strong>Node. js, Luvit, Julia, pyuv,<\/strong> and others. Libev supports only select(2), it doesn\u2019t have the provision to support poll(2) and IOCP on Windows.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>How can you scale Node.Js application?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Scaling of Node.Js application can be done in the following ways:-<br \/>\n1. Breaking the application into microservices.<br \/>\n2. By cloning using the cluster module.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>What is the reason for the existence of module exports in Node.Js?<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Making use of the modules is a prerequisite for the purpose of developing thorough applications and software systems if you are using Node.js.<br \/>\nIf for instance, modules are not present then the code will disintegrate and it will be difficult to run the application.<br \/>\nModules in Node.Js are used, to sum up, all the related codes into a single unit of code. This in turn is interpreted by shifting all related functions into a single file.<\/p>\n<ul>\n<li class=\"graf graf--p\">\n<h4><strong>When should one not use Node.Js?\u00a0<\/strong><\/h4>\n<\/li>\n<\/ul>\n<p class=\"graf graf--p\">Node.Js should not be used in applications that require long processing time or takes too much time for calculations.<\/p>\n<h2 class=\"graf graf--p\"><strong>Winding Up<\/strong><\/h2>\n<p class=\"graf graf--p\">By listing out 25 Node.js interview questions and answers we tried to cover the most important topics of Node.Js from which questions might arise in the interview. These node.js questions and answers will surely help you to pass your interview with flying colors.<\/p>\n<p class=\"graf graf--p\">We earnestly hope that this article will be of great benefit to you and if in case any query arises related to this, feel free to ask in the comment section!<\/p>\n<p class=\"graf graf--p\">Best of Luck!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Of late everyone\u2019s been talking about Node.Js and aspires to learn it because the trends of web development seem to be heading its way. The infrastructure of sites like LinkedIn, eBay, and PayPal is based on Node.Js. It allows you to mold your application according to your requirements. No doubt it\u2019s becoming widely accepted these [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3886,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,437,8],"tags":[120],"class_list":["post-3287","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-interview-questions","category-programming","tag-nodejs-interview-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>List Of The Top 25 Node.JS Interview Questions and Answers<\/title>\n<meta name=\"description\" content=\"\u200bHere is the list of the top 25 Node js interview questions and answers that the interviewer may ask you during your respective Node js interviews.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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D.","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.digitalogy.co\/blog\/#\/schema\/person\/image\/","url":"https:\/\/www.digitalogy.co\/blog\/wp-content\/litespeed\/avatar\/9c4227964f0b68250a09f9097396ea23.jpg?ver=1784685642","contentUrl":"https:\/\/www.digitalogy.co\/blog\/wp-content\/litespeed\/avatar\/9c4227964f0b68250a09f9097396ea23.jpg?ver=1784685642","caption":"Claire D."},"description":"Claire D. is a Technical Content Strategist at Digitalogy. With over Seven years of experience in tech recruitment and software development workflows, She specialize in breaking down complex topics like AI, staff augmentation, and global sourcing. When not analyzing engineering talent trends, she loves mentoring up-and-coming developers","url":"https:\/\/www.digitalogy.co\/blog\/author\/claire-d\/"}]}},"_links":{"self":[{"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/posts\/3287","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/comments?post=3287"}],"version-history":[{"count":0,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/posts\/3287\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/media\/3886"}],"wp:attachment":[{"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/media?parent=3287"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/categories?post=3287"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.digitalogy.co\/blog\/wp-json\/wp\/v2\/tags?post=3287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}