{"id":7346,"date":"2025-07-11T05:05:18","date_gmt":"2025-07-11T05:05:18","guid":{"rendered":"https:\/\/www.hirist.tech\/blog\/?p=7346"},"modified":"2025-12-29T11:11:54","modified_gmt":"2025-12-29T11:11:54","slug":"top-20-express-js-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/","title":{"rendered":"Top 20 Express JS Interview Questions and Answers"},"content":{"rendered":"\n<p>Express JS is a web framework for Node.js. It was created by TJ Holowaychuk in 2010 to make building web applications simpler and faster. Since then, it has become one of the most popular tools for backend development. Express helps developers handle routes, requests, and middleware with ease.&nbsp;If you are looking for a backend job, chances are you will be asked about Express. That\u2019s why we have put together the top 20 most asked Express JS interview questions and answers to help prepare.<\/p>\n\n\n\n<p><strong>Fun Fact \u2013<\/strong> According to the 2024 Stack Overflow Developer Survey, Express JS is the fifth most popular web framework and is used by 17% of developers.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#Basic_Level_Express_JS_Interview_Questions\" title=\"Basic Level Express JS Interview Questions&nbsp;&nbsp;\">Basic Level Express JS Interview Questions&nbsp;&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#Express_JS_Interview_Questions_for_Freshers\" title=\"Express JS Interview Questions for Freshers&nbsp;\">Express JS Interview Questions for Freshers&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#Express_JS_Interview_Questions_Experienced\" title=\"Express JS Interview Questions Experienced&nbsp;\">Express JS Interview Questions Experienced&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#Tips_to_Prepare_for_Express_JS_Interview\" title=\"Tips to Prepare for Express JS Interview\">Tips to Prepare for Express JS Interview<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#Wrapping_Up\" title=\"Wrapping Up\">Wrapping Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/#FAQs\" title=\"FAQs\">FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Basic_Level_Express_JS_Interview_Questions\"><\/span>Basic Level Express JS Interview Questions&nbsp;&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some common interview questions on Express JS to help you understand the basics and get started with preparation.&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<ol>\n<li><strong>What is Express JS and how does it relate to Node.js?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Express JS is a web framework built on top of Node.js. It helps manage routes, requests, and responses in server-side applications. Node.js provides the runtime, while Express simplifies HTTP handling.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>How do you create a basic Express server?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>First, install Express using npm install express. Then, create a file like app.js and write:<\/p>\n\n\n\n<p>const express = require(&#8216;express&#8217;);<\/p>\n\n\n\n<p>const app = express();<\/p>\n\n\n\n<p>app.get(&#8216;\/&#8217;, (req, res) =&gt; res.send(&#8216;Hello World&#8217;));<\/p>\n\n\n\n<p>app.listen(3000);<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>What is the purpose of middleware in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Middleware functions sit between the request and response cycle. They process requests, modify data, or handle errors before sending a response.<\/p>\n\n\n\n<ol start=\"4\">\n<li><strong>How do you handle routing in Express JS?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Routing is done using methods like app.get(), app.post(), etc. Each route takes a path and a callback to send a response.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>What are the different types of HTTP methods supported by Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Express supports standard HTTP methods like \u2013<\/p>\n\n\n\n<ul>\n<li>GET<\/li>\n\n\n\n<li>POST<\/li>\n\n\n\n<li>PUT<\/li>\n\n\n\n<li>DELETE<\/li>\n\n\n\n<li>PATCH<\/li>\n\n\n\n<li>HEAD<\/li>\n\n\n\n<li>OPTIONS<\/li>\n<\/ul>\n\n\n\n<ol start=\"6\">\n<li><strong>How do you serve static files in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use express.static(). Example: app.use(express.static(&#8216;public&#8217;)) to serve HTML, CSS, or images.<\/p>\n\n\n\n<ol start=\"7\">\n<li><strong>What is the role of app.listen() in an Express app?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>It tells Express to start the server and listen on a specific port for incoming requests.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Express_JS_Interview_Questions_for_Freshers\"><\/span>Express JS Interview Questions for Freshers&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This list of Express JS interview questions and answers is perfect for freshers looking to build a strong foundation.&nbsp;<\/p>\n\n\n\n<ol start=\"8\">\n<li><strong>How do you install and set up Express in a Node.js project?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Run npm init to create a project. Then use npm install express to install Express. After that, create your app.js and write the code to define routes and start the server.<\/p>\n\n\n\n<ol start=\"9\">\n<li><strong>What does req and res mean in Express route handlers?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>req is the incoming request object. It contains details like headers and data. res is the response object used to send back a reply to the client.<\/p>\n\n\n\n<ol start=\"10\">\n<li><strong>How do you define a route with route parameters in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use a colon to define a parameter: app.get(&#8216;\/user\/:id&#8217;, (req, res) =&gt; { res.send(req.params.id); }).<\/p>\n\n\n\n<ol start=\"11\">\n<li><strong>What is the use of next() in middleware functions?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>next() passes control to the next middleware in the stack. Without it, the request may hang.<\/p>\n\n\n\n<ol start=\"12\">\n<li><strong>How can you handle form data in an Express application?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Install and use express.urlencoded({ extended: true }) to parse form data submitted via POST.<\/p>\n\n\n\n<ol start=\"13\">\n<li><strong>What is the difference between app.get() and app.post()?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>app.get() handles GET requests (usually to fetch data), while app.post() handles POST requests (usually to submit data).<\/p>\n\n\n\n<ol start=\"14\">\n<li><strong>How do you handle 404 errors in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Add a middleware at the end:<\/p>\n\n\n\n<p>app.use((req, res) =&gt; {<\/p>\n\n\n\n<p>&nbsp;&nbsp;res.status(404).send(&#8216;Page not found&#8217;);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Express_JS_Interview_Questions_Experienced\"><\/span>Express JS Interview Questions Experienced&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>These are advanced interview questions on Express JS for experienced professionals.&nbsp;<\/p>\n\n\n\n<ol start=\"15\">\n<li><strong>How do you create and use custom middleware in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>You can define a function with (req, res, next) and use app.use().<\/p>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>function logTime(req, res, next) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;console.log(Date.now());<\/p>\n\n\n\n<p>&nbsp;&nbsp;next();<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p>app.use(logTime);<\/p>\n\n\n\n<ol start=\"16\">\n<li><strong>What are the pros and cons of using Express in production?<\/strong><\/li>\n<\/ol>\n\n\n\n<p><strong>Pros:<\/strong> It is fast, minimal, and has a large community.<\/p>\n\n\n\n<p><strong>Cons:<\/strong> It doesn\u2019t offer built-in security or structure, so you need to add those manually.<\/p>\n\n\n\n<ol start=\"17\">\n<li><strong>How do you manage error handling for async route handlers in Express?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use try-catch inside async functions or wrap them with error-handling middleware. In newer setups, packages like express-async-errors help catch uncaught errors.<\/p>\n\n\n\n<ol start=\"18\">\n<li><strong>How can you organize routes using express.Router()?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Create route modules using express.Router() and import them in your main app file. It helps keep code clean in larger apps.<\/p>\n\n\n\n<p>const router = require(&#8216;express&#8217;).Router();<\/p>\n\n\n\n<p>router.get(&#8216;\/users&#8217;, handler);<\/p>\n\n\n\n<p>app.use(&#8216;\/api&#8217;, router);<\/p>\n\n\n\n<ol start=\"19\">\n<li><strong>How do you handle security concerns like CORS and HTTP headers in Express apps?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use middleware like helmet to set security headers and cors to allow cross-origin requests safely. These packages are widely used and easy to set up.<\/p>\n\n\n\n<ol start=\"20\">\n<li><strong>How do you implement request validation in an Express project?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I usually use express-validator. It helps validate and sanitize input.&nbsp;<\/p>\n\n\n\n<p><strong>For example:<\/strong><\/p>\n\n\n\n<p>const { body, validationResult } = require(&#8216;express-validator&#8217;);<\/p>\n\n\n\n<p>app.post(&#8216;\/user&#8217;, body(&#8217;email&#8217;).isEmail(), (req, res) =&gt; {<\/p>\n\n\n\n<p>&nbsp;&nbsp;const errors = validationResult(req);<\/p>\n\n\n\n<p>&nbsp;&nbsp;if (!errors.isEmpty()) return res.status(400).json(errors.array());<\/p>\n\n\n\n<p>&nbsp;&nbsp;res.send(&#8216;Valid data&#8217;);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_to_Prepare_for_Express_JS_Interview\"><\/span>Tips to Prepare for Express JS Interview<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some practical tips to help you prepare for your upcoming Express JS interview.<\/p>\n\n\n\n<ul>\n<li>Review the official Express documentation and practice basic setups.<\/li>\n\n\n\n<li>Build a small CRUD app to understand routes and middleware.<\/li>\n\n\n\n<li>Learn how to handle errors and validate input.<\/li>\n\n\n\n<li>Go through real-world interview questions.<\/li>\n\n\n\n<li>Practice explaining concepts out loud, as you would in an interview.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wrapping_Up\"><\/span>Wrapping Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>These 20 Express JS interview questions and answers cover everything from basics to advanced topics. Practice them well to improve your chances of cracking backend interviews.<\/p>\n\n\n\n<p>Looking for Express JS jobs in India?<\/p>\n\n\n\n<p>Visit <a href=\"https:\/\/www.hirist.tech\/?ref=blog\" target=\"_blank\" rel=\"noreferrer noopener\">Hirist<\/a> \u2013 an online job portal built for tech professionals. It is one of the best places to find top <a href=\"https:\/\/www.hirist.tech\/k\/expressjs-jobs?ref=blog\" target=\"_blank\" rel=\"noreferrer noopener\">Express JS job openings<\/a> across India.<\/p>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-35-nodejs-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 35+ NodeJS Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1752209689688\"><strong class=\"schema-faq-question\"><strong>Are Express JS questions tough?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\">Express JS questions can be easy or tough depending on your experience. Practice is key. The more hands-on experience you have, the easier the questions feel.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752209701921\"><strong class=\"schema-faq-question\"><strong>What are the common Express framework interview questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">Here are the commonly asked Express JS interview questions \u2013<br\/>What is Express JS and why is it used?<br\/>How do you handle different HTTP methods in Express?<br\/>How does Express handle asynchronous code?<br\/>What are route guards and how can you implement them?<br\/>How do you handle 404 and other server errors in Express?<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752209709988\"><strong class=\"schema-faq-question\"><strong>What are the most asked Express Node JS interview questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">Here are the commonly asked Express Node JS interview questions \u2013<br\/>How do you handle file uploads using Express?<br\/>How can you scale an Express application in production?<br\/>How do you implement authentication in an Express app?<br\/>What\u2019s the difference between blocking and non-blocking code in Node.js?<br\/>How do you connect Express with a MongoDB or SQL database?<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752209724386\"><strong class=\"schema-faq-question\"><strong>What is the average salary for Node JS developers in India?<\/strong><\/strong> <p class=\"schema-faq-answer\">According to AmbitionBox, Node JS developers in India earn between \u20b91.8 Lakhs to \u20b913.5 Lakhs per year. Some top companies and specialized roles pay even more based on skills and experience.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752209742463\"><strong class=\"schema-faq-question\"><strong>Which top companies hire Express JS developers?<\/strong><\/strong> <p class=\"schema-faq-answer\">Many top companies in India and globally use Express JS. These include TCS, Infosys, Accenture, IBM, Cognizant, and startups like Zomato, Razorpay, and Swiggy.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Express JS is a web framework for Node.js. It was created by TJ Holowaychuk in&hellip;<\/p>\n","protected":false},"author":1,"featured_media":7354,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,29,19],"tags":[32,34,33],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 20 Express JS Interview Questions and Answers (2026) - Hirist Blog<\/title>\n<meta name=\"description\" content=\"Prepare top express js interview questions on Express.js, Node.js middleware, routing, HTTP methods, error handling &amp; API requests.\" \/>\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.hirist.tech\/blog\/top-20-express-js-interview-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 20 Express JS Interview Questions and Answers (2026) - 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