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React.js Interview Questions

Questions
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What is React and how does it differ from other JavaScript frameworks like Angular or Vue.js?
Can you explain the concept of virtual DOM in React and how it improves performance?
What are React components? Describe the difference between class components and functional component
How does state management work in React? Can you give an example of using state in a functional comp
What are props in React, and how are they used to pass data between components?
Explain the purpose of useEffect hook in functional components with an example of a common use case.
How do you handle forms in React? Provide a code snippet that demonstrates controlled vs uncontrolle
What is JSX? Why is it used in React, and how does it transform to JavaScript?
Can you explain how React handles component lifecycle? Include details about lifecycle methods in cl
How do you optimize performance in a React application? Give examples of methods you might use.
What are higher-order components (HOCs), and how are they used in React?
Describe the context API in React and its use cases. Provide a code example illustrating its impleme
How do you implement routing in a React application? What library would you choose and why?
Explain the difference between controlled and uncontrolled components in React forms with examples.
Can you illustrate how to handle API calls in a React component? Include error handling in your exam
What are React hooks? Name a few commonly used hooks and explain their purpose.
Describe the useMemo and useCallback hooks and provide examples of when to use each.
How would you implement a global state management system in React? Compare it with using local state
Can you explain the significance of keys in React lists? What potential issues can arise if keys are
What is code splitting and how does it benefit a React application? Provide an example setup.
How do you perform testing in React applications? What libraries do you typically use?
Describe the concept of "lifting state up" in React and give a scenario where it is necessary.
Can you explain error boundaries in React? How would you implement one in a React application?
How do you handle performance issues in a large-scale React application? Discuss specific strategies
What are the differences between React.memo and PureComponent?
How can you integrate third-party libraries into a React application? Provide a practical example.
Discuss how you would implement lazy loading of components in React.
Explain the differences between client-side and server-side rendering in a React application. What a
What are some common accessibility issues in React applications and how can they be addressed?
Discuss how to create and use custom hooks in React with an example.
Explain the flow of data in a React application. How does it differ when using Redux for state manag
How do you handle authentication in a React application? Provide a high-level overview of your appro
Can you explain the concept of reconciliation in React and how it impacts rendering performance?
Describe how to implement a responsive design in a React application. What tools or libraries would
Explain how to manage side effects in React using middleware like Redux Saga or Thunk.
What is the significance of the useImperativeHandle hook? Provide an example of its usage.
Discuss the role of TypeScript in a React application. What benefits does it provide?
How would you implement error handling for asynchronous operations in a React application?
Describe a situation where you would need to use refs in React. Provide a code example to illustrate
How can you enhance the SEO of a React application? Discuss strategies related to both static and dy

What is React and how does it differ from other JavaScript frameworks like Angular or Vue.js?