700+ React Interview Questions Practice Set [2026]

React Interview Questions & Answers | Crack Any Interview | Beginner to AdvancedWelcome to "React Interview Questions and Answers Practice Sets" – your practical guide to mastering React concepts through carefully designed practice questions and detailed explanations.This course is built to help you confidently prepare for Frontend Developer, React Specialist, and Full-Stack Engineer interviews. By working through these sets, you will strengthen your understanding of React Interview Questions, core architecture, state management, performance optimization, and the modern React ecosystem.Whether you are a beginner or looking to master expert-level concepts, these structured practice sets will help you identify knowledge gaps and build the confidence needed to tackle real-world React Interview Questions and technical challenges.Set 1 – React FundamentalsWhat is React: Learn the basics of this JavaScript library for building user interfaces.History of React: Explore the origins and evolution of React at Facebook.Why use React: Understand the benefits of component-based architecture and declarative UI.Understanding SPA (Single Page Applications): Learn how React enables seamless navigation without page refreshes.Setting up Node.js for React: Prepare your environment for modern React development.Creating a React app using Create React App: Use the classic CLI tool to bootstrap projects.Creating a React app using Vite: Learn to use the modern, faster alternative for project setup.Project folder structure: Understand how to organize files and folders effectively.Understanding package.json: L