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Top 50 React.js interview questions •⁠ ⁠⁠What is React? •⁠ ⁠What are the main features of React? •⁠ ⁠What is JSX? •⁠ ⁠What are components in React? •⁠ ⁠Difference between functional and class components? •⁠ ⁠What is the virtual DOM? •⁠ ⁠How does the virtual DOM work? •⁠ ⁠What are props in React? •⁠ ⁠What is state in React? •⁠ ⁠Difference between props and state? •⁠ ⁠What are hooks in React? •⁠ ⁠What is the useState hook used for? •⁠ ⁠What is the useEffect hook used for? •⁠ ⁠What is the useContext hook? •⁠ ⁠What is the useRef hook used for? •⁠ ⁠What is the useMemo hook and why is it used? •⁠ ⁠What is the useCallback hook? •⁠ ⁠What is prop drilling and how can it be avoided? •⁠ ⁠What are React fragments? •⁠ ⁠What is the difference between controlled and uncontrolled components? •⁠ ⁠What are React keys and why are they important? •⁠ ⁠What is React Router? •⁠ ⁠How does conditional rendering work in React? •⁠ ⁠What is React reconciliation? •⁠ ⁠What is the purpose of React.memo()? •⁠ ⁠What is higher-order component (HOC) in React? •⁠ ⁠What is context API and when should you use it? •⁠ ⁠How do you handle forms in React? •⁠ ⁠What is lifting state up in React? •⁠ ⁠What is React Fiber? •⁠ ⁠What is Redux and why is it used? •⁠ ⁠What is the difference between Redux and Context API? •⁠ ⁠What is a reducer function in Redux? •⁠ ⁠What are pure components in React? •⁠ ⁠What is lazy loading in React? •⁠ ⁠What is suspense in React? •⁠ ⁠How do you optimize performance in React apps? •⁠ ⁠What are React portals? •⁠ ⁠What is server-side rendering (SSR) in React? •⁠ ⁠What is hydration in React? •⁠ ⁠What is the difference between useEffect and useLayoutEffect? •⁠ ⁠How does React handle reconciliation? •⁠ ⁠What is error boundary in React? •⁠ ⁠What is the purpose of React.StrictMode? •⁠ ⁠What is custom hook in React? •⁠ ⁠How to share logic between components in React? •⁠ ⁠What are the lifecycle methods in class components? •⁠ ⁠What is the difference between React and React Native? •⁠ ⁠What is the difference between createElement and JSX? •⁠ ⁠How does React handle events differently from HTML? Click on 🔥 if you like this and found it helpful!

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