React Interviw qustion and ansers

React Developer Interview Questions (10+ Years Experience)

1. Can you explain the virtual DOM and how React uses it for performance optimization?

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2. What are the key differences between React class components and functional components?

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3. How does React's reconciliation algorithm work?

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4. What is the purpose of hooks in React, and can you give an example of useState and useEffect?

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5. What are controlled and uncontrolled components in React?

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6. How would you optimize a large React application for performance?

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7. Can you explain the Context API and its usage in React applications?

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8. How do you manage state in a large-scale React application?

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9. What is server-side rendering (SSR) in React, and what are its benefits?

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10. Can you explain the concept of higher-order components (HOCs) in React?

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11. How does React's error boundary work? Can you explain the use of componentDidCatch?

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12. How would you handle authentication and authorization in a React app?

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13. What are React’s lifecycle methods and how do you use them in class components?

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14. Can you explain the concept of "lifting state up" in React?

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15. What is Redux, and how does it work with React?

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16. What are the key differences between Redux and React's Context API?

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17. How would you handle routing in a React application? Can you describe how React Router works?

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18. What tools and strategies do you use for testing React components?

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19. Can you explain how code splitting works in React and why it's important?

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20. How do you approach accessibility (a11y) in React applications?

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