List of React.js 500 questions

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React Questions (500)

Basic Concepts

  1. What is React and why is it used?
  2. What is the virtual DOM in React?
  3. Explain the difference between a functional component and a class component in React.
  4. What are props in React?
  5. What is state in React and how does it work?
  6. What is JSX in React?
  7. How do you handle events in React?
  8. What is the useState hook in React?
  9. What is the useEffect hook in React?
  10. What are lifecycle methods in React (e.g., componentDidMount)?
  11. How do you pass data between components in React?
  12. What is the purpose of keys in React lists?
  13. What is the difference between componentWillMount and componentDidMount in React?
  14. How do you handle forms in React?
  15. What are controlled components in React?
  16. What are uncontrolled components in React?
  17. What is the React Context API?
  18. How do you use useContext hook in React?
  19. What are higher-order components (HOC) in React?
  20. What is the purpose of React.Fragment?

Intermediate Concepts

  1. What are the advantages of using React Hooks over class components?
  2. What is the purpose of the useReducer hook?
  3. How do you handle routing in React?
  4. What is React Router?
  5. How do you create a custom hook in React?
  6. How do you manage state in a React application?
  7. What is Redux and how do you use it with React?
  8. What are reducers and actions in Redux?
  9. What is the role of connect in Redux?
  10. What is Redux Thunk?
  11. What is the difference between useState and useReducer?
  12. How do you optimize the performance of a React app?
  13. How do you memoize components in React?
  14. What are React Suspense and React.lazy()?
  15. How do you fetch data in React using the useEffect hook?
  16. What is a React event handler?
  17. What is prop drilling and how do you avoid it?
  18. How does the React reconciliation algorithm work?
  19. How do you use controlled forms with React?
  20. How does React’s error boundary work?

Advanced Concepts

  1. What is the Context API and when should you use it over Redux?
  2. What is the difference between shallow rendering and full DOM rendering in React testing?
  3. What is the purpose of React’s StrictMode?
  4. How do you handle authentication in React?
  5. How do you implement server-side rendering (SSR) in React?
  6. What is Next.js and how does it relate to React?
  7. How does React handle code splitting?
  8. How do you implement lazy loading in React?
  9. What is React Fiber?
  10. How do you implement progressive web apps (PWAs) with React?

Testing

  1. How do you test React components using Jest?
  2. What is Enzyme and how does it help in React testing?
  3. How do you mock API calls in Jest for React testing?
  4. What is the purpose of shallow rendering in Enzyme?
  5. How do you test React hooks?
  6. What is the act function in React testing?
  7. How do you use React Testing Library?
  8. How do you test async functions in React?
  9. How do you test Redux with React?
  10. How do you mock props in React testing?

State Management

  1. What is Redux and why is it used in React applications?
  2. What are the main principles of Redux?
  3. What are reducers in Redux?
  4. How does Redux store state?
  5. How do you dispatch actions in Redux?
  6. How do you use middleware like Redux Thunk with React?
  7. What is Redux Saga and how does it differ from Redux Thunk?
  8. How do you structure a Redux store for large applications?
  9. What is the role of selectors in Redux?
  10. How do you handle side effects in Redux?

Optimization

  1. What is memoization and how do you use it in React?
  2. How does React handle re-renders?
  3. What is the useMemo hook in React?
  4. What is React.PureComponent and how does it optimize performance?
  5. How can you avoid unnecessary re-renders in React components?
  6. What is React’s shouldComponentUpdate method used for?
  7. How do you optimize large lists in React (e.g., using windowing)?
  8. What is code splitting and how do you implement it in React?
  9. How do you lazy-load components in React?
  10. How do you handle large-scale state management efficiently?

Security

  1. How do you prevent XSS attacks in React?
  2. What is JWT and how do you implement authentication in React with JWT?
  3. How do you secure React apps with OAuth 2.0?
  4. How do you handle Cross-Origin Resource Sharing (CORS) issues in React?
  5. What is Content Security Policy (CSP) and how do you implement it in React?

Miscellaneous

  1. What is React DevTools and how do you use it?
  2. How do you deploy a React app to production?
  3. What are the different types of routing in React?
  4. What is the role of useEffect in React?
  5. How do you configure Webpack for React applications?
  6. What is a custom hook in React and how do you create one?
  7. How do you use CSS-in-JS libraries like styled-components in React?
  8. How do you manage global state in React without Redux?
  9. How do you handle error boundaries in React?
  10. How do you handle animations in React?
  11. How does React handle forms?
  12. How do you debug React applications?
  13. What is React’s reconciliation algorithm and why is it important?
  14. How do you manage authentication and authorization in React apps?
  15. How do you upgrade React to a newer version?

React Questions (200)

Basic Concepts

  1. What are functional components in React?
  2. What are class components in React?
  3. What is JSX and how does it work in React?
  4. How do you handle state in React?
  5. What is the difference between state and props in React?
  6. How do you handle events in React components?
  7. How does React manage the virtual DOM?
  8. What is the useState hook and how does it work?
  9. What is the useEffect hook in React?
  10. What are React lifecycle methods and how do they work?
  11. How do you pass data from parent to child components in React?
  12. How do you use props in React components?
  13. What is the difference between controlled and uncontrolled components in React?
  14. How do you handle conditional rendering in React?
  15. What is the role of keys in React lists?
  16. How do you bind methods to this in React?
  17. What are useContext and useReducer hooks in React?
  18. What is React Router and how does it manage routing in React apps?
  19. How do you handle forms in React?
  20. What is the purpose of React.Fragment?

Intermediate Concepts

  1. What are hooks in React and why are they introduced?
  2. How do you implement conditional rendering in React?
  3. What is React.memo and how does it improve performance?
  4. What are higher-order components (HOCs) in React?
  5. How do you create custom hooks in React?
  6. How do you manage state across multiple components in React?
  7. What is Redux and how is it used for state management in React?
  8. How do you manage asynchronous actions in React using Redux?
  9. What are React Router’s useParams and useHistory hooks?
  10. How do you implement authentication in React using JWT?
  11. How does React's reconciliation algorithm work?
  12. How do you use React.lazy and Suspense for lazy loading?
  13. How do you optimize large lists in React (e.g., using windowing)?
  14. What is the useCallback hook and when do you use it in React?
  15. What is the useMemo hook in React and when do you use it?
  16. How does React handle form input and validation?
  17. What is state lifting in React?
  18. How do you implement server-side rendering (SSR) in React?
  19. How does React handle code splitting?
  20. What is React’s StrictMode used for?

Advanced Concepts

  1. What is React Fiber and how does it improve React's performance?
  2. How do you implement Progressive Web Apps (PWA) in React?
  3. How do you handle background tasks in React (e.g., with Web Workers)?
  4. What is React’s error boundary, and how do you use it?
  5. How do you implement server-side rendering (SSR) in React with Next.js?
  6. How do you use React Suspense for data fetching?
  7. How do you implement code-splitting in a React app?
  8. How do you configure Webpack for React?
  9. How do you handle component lifecycle methods in functional components?
  10. How do you pass data between sibling components in React?
  11. What are the advantages of using React’s functional components over class components?
  12. How do you manage global state without Redux in React?
  13. How do you optimize React for large applications?
  14. What is the purpose of useRef in React?
  15. How do you handle routing in a React application with dynamic segments?
  16. How do you integrate third-party libraries in React?
  17. What are controlled and uncontrolled components in React forms?
  18. What is the purpose of useImperativeHandle in React?
  19. How does React handle asynchronous rendering?
  20. How do you handle performance optimization in React?

Testing

  1. How do you test React components using Jest?
  2. How do you mock API calls in React tests?
  3. How do you test hooks in React?
  4. What is shallow rendering and when should you use it in testing?
  5. How do you simulate user events in React testing?
  6. How do you use React Testing Library for testing React components?
  7. How do you test asynchronous functions in React?
  8. What are mock functions and how are they used in React testing?
  9. How do you test Redux-connected components in React?
  10. What is the role of act in React testing?
  11. How do you test conditional rendering in React?
  12. How do you test React Router’s Link components?
  13. How do you test form input and validation in React?
  14. How do you test an API call in React?
  15. How do you test React components that use hooks?
  16. What is the role of jest.fn() in mocking functions in React tests?
  17. How do you test Redux reducers in React?
  18. How do you handle integration testing in React?
  19. How do you simulate user input in React forms?
  20. How do you handle end-to-end testing in React?

Miscellaneous

  1. How do you optimize the performance of a React application?
  2. How do you deploy a React application to Firebase, AWS, or Heroku?
  3. How do you manage environment variables in React?
  4. How do you handle CSS styling in React?
  5. What are styled-components and how do they work in React?
  6. How do you handle animations in React?
  7. What are React’s concurrent mode features and how do they improve performance?
  8. How do you handle routing with React Router?
  9. How do you manage authentication and authorization in React apps?
  10. How do you integrate React with a backend server?
  11. How do you create reusable components in React?
  12. What is the role of useEffect in React for side effects?
  13. How do you implement real-time features in React (e.g., WebSockets)?
  14. How do you manage dynamic imports in React?
  15. How do you create a responsive UI in React?
  16. How do you handle browser storage (localStorage, sessionStorage) in React?
  17. How do you use the useLayoutEffect hook in React?
  18. How do you handle component reusability in React?
  19. How do you set up code splitting in React?
  20. How do you handle conditional rendering with React?

Basic Concepts

  1. What is JSX and how is it used in React?
  2. How does React handle state and props?
  3. What is the difference between a class component and a functional component?
  4. What are the advantages of using functional components in React?
  5. How does React manage event handling?
  6. What is the purpose of useState hook in React?
  7. How does React handle re-rendering and component updates?
  8. How do you pass data between parent and child components in React?
  9. What is a controlled component in React?
  10. What is an uncontrolled component in React?
  11. How do you manage forms in React?
  12. What are the lifecycle methods in React class components?
  13. How do you use useEffect in React?
  14. What is React Router and how does it work for routing?
  15. How do you conditionally render components in React?
  16. What is the key prop in React, and why is it important?
  17. What is the difference between state and props in React?
  18. How does the Virtual DOM work in React?
  19. What are React fragments and why are they used?
  20. What is the purpose of the useContext hook in React?

Intermediate Concepts

  1. How do you manage state across multiple components in React?
  2. What is Redux and how does it integrate with React?
  3. How do you handle asynchronous actions in Redux?
  4. How do you use Redux middleware such as Redux Thunk or Redux Saga?
  5. How do you manage global state without Redux in React?
  6. What are Higher Order Components (HOCs) in React?
  7. How do you use useRef in React?
  8. What is useMemo and how does it help optimize performance in React?
  9. How do you use useCallback in React?
  10. What are React’s context API and how do you use it?
  11. How do you optimize React applications for performance?
  12. What is React.memo and how does it optimize re-renders?
  13. What is lazy loading in React, and how do you implement it?
  14. What is Server-Side Rendering (SSR) in React, and how does it work?
  15. What is React Suspense and how does it help in asynchronous rendering?
  16. How do you handle form validation in React?
  17. What is the difference between useEffect and useLayoutEffect in React?
  18. How do you create and use custom hooks in React?
  19. What are React's error boundaries and how do you use them?
  20. What is the useReducer hook in React, and when should you use it?

Advanced Concepts

  1. What is React Fiber and how does it improve performance?
  2. How do you manage authentication in a React app?
  3. What is code splitting in React, and how does it improve performance?
  4. How does React handle asynchronous rendering with Suspense?
  5. How do you implement Progressive Web Apps (PWA) in React?
  6. How do you use Web Workers in React for background tasks?
  7. How do you use React with TypeScript?
  8. What is the role of Redux DevTools in debugging React applications?
  9. How do you configure Webpack for a React application?
  10. How do you handle testing of asynchronous components in React?
  11. How do you handle complex forms in React using Formik or React Hook Form?
  12. How does React handle server-side rendering (SSR) with Next.js?
  13. How do you implement real-time features (e.g., WebSockets) in React?
  14. How do you set up code-splitting for dynamic imports in React?
  15. What are React's concurrent rendering features and how do they improve UX?
  16. How do you use React's Context API for global state management?
  17. What is React's shallow rendering and how does it help in testing?
  18. How do you optimize React applications for SEO?
  19. How do you handle dynamic imports in React?
  20. How do you handle error handling in React with error boundaries?

Testing

  1. How do you test React components using Jest and React Testing Library?
  2. How do you mock API calls in Jest for React testing?
  3. How do you test React components with hooks?
  4. How do you test asynchronous actions and promises in React?
  5. How do you test form validation in React using Jest?
  6. How do you test Redux-connected components in React?
  7. How do you test React Router components in Jest?
  8. How do you simulate user input in React tests?
  9. What is the purpose of mocking functions in React testing?
  10. How do you test error boundaries in React?
  11. How do you test React context using Jest?
  12. How do you test the behavior of a component with multiple props?
  13. How do you mock useEffect in React tests?
  14. How do you test performance optimizations in React?
  15. What is shallow rendering in React testing and when should it be used?
  16. How do you test React components that use third-party libraries?
  17. How do you test the state updates in React components?
  18. How do you handle integration testing in React?
  19. How do you test React components that use Redux?
  20. How do you use React's act utility in testing?

Miscellaneous

  1. How do you handle routing in a React application with dynamic paths?
  2. How do you set up a React application with Webpack and Babel?
  3. What is the role of React's StrictMode?
  4. How do you deploy a React application to production?
  5. How do you handle environment variables in React?
  6. How do you integrate React with external APIs or third-party services?
  7. How do you use styled-components or CSS-in-JS in React?
  8. How do you manage application state with Redux in React?
  9. How do you implement animations in React using React Transition Group?
  10. How do you handle conditional styling in React?
  11. How do you handle internationalization (i18n) in React?
  12. How do you create reusable components in React?
  13. How do you use React's useImperativeHandle hook?
  14. How do you manage large lists or tables in React efficiently?
  15. How do you handle component lifecycle methods in functional components using hooks?
  16. How do you integrate React with a backend (e.g., Node.js, Django)?
  17. How do you manage sessions and authentication in React applications?
  18. How do you set up continuous integration/continuous deployment (CI/CD) for React?
  19. How do you handle responsive design in React?
  20. How do you use TypeScript with React?

Basic Concepts

  1. What is JSX and why is it used in React?
  2. What is the difference between state and props in React?
  3. What are React hooks, and how do they simplify state management?
  4. What is the purpose of useState in React?
  5. How do you pass data between parent and child components in React?
  6. How do you handle forms in React?
  7. What are controlled and uncontrolled components in React?
  8. What is the role of the useEffect hook in React?
  9. What are functional components in React?
  10. How do you create a class-based component in React?
  11. How do you handle events in React?
  12. What is the purpose of useContext in React?
  13. How do you use useRef in React?
  14. What is a key prop in React, and why is it important?
  15. How do you pass functions as props in React?
  16. What is conditional rendering in React?
  17. What is the dangerouslySetInnerHTML attribute in React used for?
  18. What is the difference between React’s useEffect and useLayoutEffect hooks?
  19. How do you pass default props to a React component?
  20. What is React Router and how do you implement routing?

Intermediate Concepts

  1. What is Redux and how does it integrate with React?
  2. How do you manage global state in React using Redux?
  3. What are Redux actions and reducers?
  4. How does the React Context API work for state management?
  5. What is the difference between local state and global state in React?
  6. How do you manage side effects in Redux with middleware like Redux Thunk?
  7. How do you handle API requests in React?
  8. What are Higher-Order Components (HOCs) in React?
  9. How do you perform form validation in React?
  10. How do you manage routing in a React application using React Router?
  11. How do you handle authentication in React applications?
  12. What are React's useCallback and useMemo hooks used for?
  13. What are the benefits of using functional components in React over class-based components?
  14. How do you implement error boundaries in React?
  15. What is code splitting in React and why is it important?
  16. How do you create a custom hook in React?
  17. What is React.memo and how does it optimize component rendering?
  18. How do you implement lazy loading in React?
  19. How does React handle component updates and re-renders?
  20. How do you manage context values in React?

Advanced Concepts

  1. What is React’s Concurrent Mode and how does it improve performance?
  2. How do you use React Suspense for data fetching?
  3. What is Server-Side Rendering (SSR) in React, and how does it work?
  4. What is the purpose of React.lazy and how do you use it?
  5. How do you handle real-time data with WebSockets in React?
  6. How do you handle state management in a large React app?
  7. What is a React Fiber and how does it improve rendering performance?
  8. How do you implement server-side rendering in a React app using Next.js?
  9. What is the purpose of React's context API?
  10. How do you implement code splitting with React Router?
  11. What is the role of the React act function in testing?
  12. How do you test React components using Jest and React Testing Library?
  13. What is React’s useReducer hook and when should it be used?
  14. How do you optimize large lists and tables in React?
  15. How do you handle error handling in React with ErrorBoundary?
  16. What are the differences between useEffect and useLayoutEffect in React?
  17. What is React's StrictMode used for?
  18. How do you use the useImperativeHandle hook in React?
  19. How do you integrate third-party libraries like D3.js with React?
  20. How do you deploy a React app to production?

Testing

  1. How do you mock API requests in React tests?
  2. How do you perform unit testing of a React component?
  3. How do you test asynchronous code in React?
  4. How do you test state updates in React components?
  5. What is the purpose of Jest’s snapshot testing in React?
  6. How do you test React hooks?
  7. How do you handle events in React tests?
  8. How do you use React Testing Library for testing React components?
  9. How do you perform integration testing with React Router?
  10. How do you mock Redux stores in React testing?
  11. How do you simulate user input in React tests?
  12. How do you test conditional rendering in React?
  13. How do you test forms in React using Jest and React Testing Library?
  14. What is the role of the act() method in React testing?
  15. How do you test error boundaries in React?
  16. How do you test component lifecycle methods in React?
  17. How do you test API calls using Jest and mocking services in React?
  18. How do you handle testing of components that require data fetching?
  19. How do you test Redux-connected components in React?
  20. How do you test third-party integrations with React?

Miscellaneous

  1. How do you implement internationalization (i18n) in React?
  2. How do you handle form submission in React?
  3. How do you handle browser storage (localStorage, sessionStorage) in React?
  4. What are React's event handling models?
  5. How do you handle SEO for React applications?
  6. How do you manage authentication tokens in React?
  7. How do you optimize images in a React application?
  8. How do you manage static files in React?
  9. How do you configure environment variables in React?
  10. How do you deploy a React application to AWS?
  11. How do you handle responsive design in React applications?
  12. How do you use CSS-in-JS libraries like styled-components in React?
  13. How do you handle cross-browser compatibility issues in React?
  14. How do you debug performance issues in React?
  15. How do you set up continuous integration for React applications?
  16. How do you add custom fonts in React?
  17. How do you use TypeScript with React?
  18. How do you optimize React components for large-scale applications?
  19. How do you handle component styling in React?
  20. How do you handle data persistence in React?

Basic Concepts

  1. What is the difference between props and state in React?
  2. How does React handle events and event handling?
  3. What is JSX and how does it differ from HTML?
  4. How do you bind methods in React components?
  5. What is the significance of the key prop in React lists?
  6. How do you handle forms in React?
  7. What are controlled components in React?
  8. What is the useState hook and how is it used?
  9. How does React handle re-rendering of components?
  10. How do you handle dynamic class names in React?

Intermediate Concepts

  1. How do you implement routing in a React application using React Router?
  2. How do you manage component-level state in React?
  3. What are functional components, and how do they differ from class components in React?
  4. How do you use the useEffect hook in React?
  5. How does React handle conditional rendering?
  6. How do you pass data between parent and child components in React?
  7. How do you use context API for state management in React?
  8. What is the role of React.Fragment?
  9. How do you perform side-effects in React using useEffect?
  10. How do you handle component lifecycle in React with hooks?

Advanced Concepts

  1. How do you implement server-side rendering (SSR) in React using Next.js?
  2. What is React Suspense and how does it help with code splitting?
  3. What is the purpose of useRef in React and how do you use it?
  4. How do you handle performance optimization in React?
  5. How do you implement authentication in a React app?
  6. What is Redux and how do you integrate it with React?
  7. What are Redux middleware and how are they used in React?
  8. What is the purpose of useMemo and useCallback in React?
  9. How do you implement lazy loading in React with React.lazy?
  10. How do you manage component state using useReducer?

Testing

  1. How do you perform unit testing in React using Jest?
  2. How do you mock API requests in React tests?
  3. What is the purpose of React Testing Library, and how do you use it?
  4. How do you test React hooks?
  5. How do you test async components in React?
  6. How do you test a form in React using Jest and React Testing Library?
  7. How do you test a component with props and state in React?
  8. How do you handle integration testing in React?
  9. How do you mock Redux store for testing in React?
  10. How do you handle component lifecycle methods in testing for React?

Miscellaneous

  1. How do you implement internationalization (i18n) in React?
  2. How do you use styled-components in React?
  3. How do you handle browser storage in React (localStorage, sessionStorage)?
  4. How do you integrate third-party libraries in React?
  5. How do you optimize images in React for faster load times?
  6. What is the difference between componentWillMount and useEffect in React?
  7. How do you handle error boundaries in React applications?
  8. How do you implement routing with dynamic parameters in React?
  9. How do you deploy a React application to Firebase?
  10. How do you handle accessibility (a11y) in React applications?

Basic Concepts

  1. What is JSX and how does it differ from HTML?
  2. How do you define state in a React functional component?
  3. What are the advantages of using functional components over class components in React?
  4. How do you pass data between components in React?
  5. What are React props, and how do they work?
  6. How does React manage component rendering and re-renders?
  7. What is the useEffect hook in React and how is it used?
  8. What is the role of useContext in React, and how is it used for state management?
  9. What are React fragments and when should they be used?
  10. How do you handle events in React?

Intermediate Concepts

  1. How do you handle state management in large React applications?
  2. How do you implement conditional rendering in React?
  3. What is Redux, and how do you use it with React?
  4. What is the purpose of the useReducer hook in React?
  5. How do you optimize performance in React using useMemo and useCallback?
  6. How do you perform form validation in React?
  7. What is React Router and how do you set up routing in a React app?
  8. How do you manage component lifecycle in React?
  9. What is the useRef hook in React, and how is it used?
  10. How do you perform error handling in React components?

Advanced Concepts

  1. How do you implement server-side rendering (SSR) in React using Next.js?
  2. How do you use React Suspense for data fetching?
  3. What is React's context API, and how is it different from using Redux for state management?
  4. How do you implement code splitting in React with React.lazy?
  5. What are Higher-Order Components (HOCs), and how do they work in React?
  6. How do you handle side-effects in React using useEffect?
  7. What is React’s concurrent rendering, and how does it improve performance?
  8. How do you handle authentication in a React app?
  9. How do you deploy a React application to production (e.g., using Vercel, AWS, Firebase)?
  10. How do you integrate third-party libraries like D3.js with React?

Basic Concepts

  1. How do you handle form submissions in React?
  2. What is the difference between a controlled and an uncontrolled component in React?
  3. What is the useState hook, and how do you update the state in a functional component?
  4. How do you pass functions as props in React?
  5. How do you handle event binding in React components?

Intermediate Concepts

  1. How do you use React’s useEffect to handle asynchronous operations like data fetching?
  2. What is JSX, and why is it used in React?
  3. How do you conditionally render components or elements in React?
  4. What are React hooks, and how do they enhance the use of functional components?
  5. How do you implement dynamic routing in React using React Router?

Basic Concepts

  1. How does React’s state differ from props, and when should you use each?
  2. How do you update the state of a component in React?
  3. What is the role of render() method in React class components?
  4. How do you create reusable components in React?
  5. What is the key prop used for in React lists?

Intermediate Concepts

  1. How do you handle form validation in React using controlled components?
  2. How does React’s useEffect hook help in managing side-effects in functional components?
  3. How do you use the React Context API to manage global state?
  4. How do you implement dynamic routing in React using React Router?
  5. How do you prevent unnecessary re-renders in React using memoization techniques?
This list should cover a comprehensive range of topics for React, from basic to advanced questions, to help deepen your understanding or prepare for interviews!

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