InterviewWithCode

JavaScript is the backbone of web development, and whether you're applying for a frontend or full-stack role, you will face JavaScript questions in your interview. In this post, we’ve compiled the top 15 most commonly asked JavaScript interview questions — from the basics to tricky advanced topics, complete with clear answers and examples. 📌 Table of Contents What is the difference between == and === ? What are closures in JavaScript? What is hoisting? What are callback functions? What is the event loop? Difference between var , let , and const What is a Promise? What is async/await? What is the difference between null and undefined? Explain “this” keyword in JavaScript What is prototypal inheritance? What are arrow functions? Explain setTimeout and setInterval What is a higher-order function? How does JavaScript handle asynchronous code? ❓ Q1: What is the difference between == and === ? ✅ == compares values after type coe...

Preparing for a web development interview can be overwhelming, especially when you're expected to know both frontend and backend technologies. Whether you're a fresher or an experienced developer brushing up your skills, this post covers the most commonly asked interview questions and answers across HTML, CSS, JavaScript, React, Node.js, and more . 📌 Table of Contents HTML Interview Questions CSS Interview Questions JavaScript Interview Questions React Interview Questions Node.js Interview Questions Bonus Tips 🔶 HTML Interview Questions ❓ Q1: What is the difference between <div> and <section>? ✅ <div> is a generic container, while <section> is a semantic element used to define meaningful sections of a document like articles or chapters. ❓ Q2: What is a semantic HTML element? ✅ Semantic elements clearly describe their meaning in both the browser and developer perspective (e.g., <header>, <footer>, <art...