Top 30 React JS Interview Questions 2026 | React Interview Questions and Answers | MindMajix

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🔥 Join MindMajix's React Certification Course: https://mindmajix.com/react-js-training?utm_source=youtube&utm_medium=video&utm_campaign=promotion Ace your React interview. This video covers React js interview questions and answers for freshers and experienced candidates. Learn about JSX, React components, State vs Props, React Hooks and Custom Hooks, Virtual DOM and more. We'll cover everything from basic to advanced and scenario-based questions to help you clear React interview. #ReactInterview #ReactInterviewQuestions #ReactjsInterviewQuestions #ReactInterviewQuestionsAndAnswers #ReactInterviewQuestions2025 #ReactjsInterview #ReactInterviewQuestionsForFreshers #CodingInterview #WebDevelopment #Mindmajix ✅ React Interview Questions For Freshers: 00:00:00 Introduction 00:01:57 What is React.js? 00:02:19 What are the main features of React? 00:02:45 What is JSX and why is it used in React? 00:03:11 What is the difference between a functional component and a class component? 00:03:35 What are the props in React? 00:03:58 How would you create a button component that changes colour when clicked? 00:04:53 Create a component that accepts a username as a prop and displays a greeting 00:05:44 What will be the output of the following code? 00:06:34 You create a simple list component, how would you do it using map() function? 00:07:22 How can you conditionally render a component in React? ✅ Intermediate Level React.js Interview Questions: 00:08:12 What is the difference between state and props? 00:08:25 How does React's vitual DOM work? 00:08:45 What are React Hooks? Name some commonly used hooks. 00:09:16 What is the context API in React? 00:09:30 What is React Router? 00:09:57 How could you pass data from a child component to a parent component? 00:10:46 How do you fetch API data in a React component? 00:11:24 You need to prevent unnecessary re-renders of a component. How can you do this? 00:11:48 How do you handle form submission in React? 00:12:35 What is lazy loading in React? ✅ React Interview Questions For Experienced: 00:13:06 What is reconciliation in React? 00:13:24 What are higher-order components (HOCs)? 00:13:40 What is the significance of useCallback and useMemo? 00:13:54 How does server-side rendering (SSR) work in React? 00:14:09 What is React Fiber? ✅ Scenario-based React Interview Questions: 00:14:37 You need to optimize a slow-rendering component. How would you do it? 00:14:53 How would you handle authentication in React? 00:15:07 How would you handle a memory leak in a React component? 00:15:49 How can you implement infinite scrolling in React? 00:16:09 How do you debug performance issues in a React application? 🔘 How do I prepare for a React interview? Focus on core React concepts like components, hooks, state management, and lifecycle methods, and practice coding problems and common interview questions. 🔘 What are common React.js interview questions for beginners? Beginners can expect questions on Prop, JSX, functional and a class component, rendering. ✅ About MindMajix's React Course: MindMajix’s React.js training will enable you to develop composable user interfaces, reusable UI components, and dynamic web applications. It trains you on enhancing application performance, maintaining larger applications, debugging errors, and creating modular user interfaces and mobile applications. Our course includes virtual classroom training sessions, real-world use cases, and projects to give you in-depth knowledge of this component-based front-end library. 🔑 Key Features 👉 Learn from Industry Experts. 👉 Gain Job-ready Skills. 👉 24/7 Support. 👉 Dedicated Learning Mentors. 👉 Guaranteed Job Interviews. 👉 Real-life Projects. 👉 Get Certified. 📌 Subscribe to our channel to get video updates. Click on the link to subscribe: https://www.youtube.com/channel/UCkKemMaRnFPlNLHZ0zOYfpA