React JS Interview Questions And Answer 2023 -2024
Most Asked React JS Interview Questions
- What is ReactJS?
- Why is ReactJS used?
- How does ReactJS work?
- What are the features of ReactJS?
- What is JSX?
- How to create components in ReactJS?
- What are the advantages of ReactJS?
- Explain the difference between real DOM and virtual DOM?
- What are forms in ReactJS?
- How is React different from React Native?
Basic Level – React JS Interview Questions
Here are some feedback interview questions on basic concepts.
- What are the features of React?
- What is JSX?
- Can web browsers read JSX directly?
- What is Virtual DOM?
- Why use React instead of other frameworks like Angular?
- What is the difference between ES6 and ES5 standards?
- How do you build a React app?
- What is an event in React?
- How do you create an event in React?
- What are synthetic events in React?
- Explain how lists work in React
- Why is it necessary to use keys in lists?
- What are forms in React?
- How do you create a form in React?
- How do you write comments in React?
- What is arrow function and how is it used in React?
- How is React different from React Native?
- How is React different from Angular?
React JS Interview Questions on Components
- What are the components in React?
- What is the use of render() in React?
- What is state in React?
- How do you enforce state in React?
- How do you update the state of a component?
- What are props in React?
- How do you pass props between components?
- What are the differences between state and props?
- What is a higher-order component in React?
- How can you embed two or more components into one?
- What are the differences between class and functional components?
- Explain the life cycle methods of components.
ReactJS Redux Interview Questions
- What is Redux?
- What are the components of Redux?
- What is flux?
- How is Redux different from Flux?
React JS Interview Questions Router
Here are some ReactJS interview questions on React Router concepts.
- What is React Router?
- Why do we need React Router?
- How is React Routing different from traditional routing?
- How do you implement React Routing?
ReactJS Styling Questions
Here are some ReactJS interview questions on Styling Concepts ReactJS.
- How do you style React components?
- Explain the use of CSS module in React.
Testing React JS Interview Questions
- What is Shallow Renderer in React testing?
- What is TestRenderer package in React?
- What is the purpose of the ReactTestUtils package?
- What is 149 Zest?
- What are the advantages of Zest over Jasmine?
- Give a simple example of Jest test case
React supported libraries and integrations
- What is reselect and how does it work?
- What is flow?
- What is the difference between Flow and Protypes?
- How to use font-awesome icons in React?
- What are React Dev Tools?
- Why is DevTools for local files not loading in Chrome?
- How to use Polymer in React?
- What are the advantages of React over Vue.js?
- What is the difference between React and Angular?
- Why is the React tab not showing in DevTools?
- What are 202 style components?
- Give an example of 203 styled components?
- What is 204 relay?
- How to use TypeScript in create-react-app application?
React JS Miscellaneous Question for Interview
- What are the main features of ReSelect Library?
- Give an example of re-selection usage?
- Does statics object work with ES6 classes in React?
- Can Redux be used only with React?
- Do you need to have any special build tools to use Redux?
- How are Redux forms updated from initial values state?
- How do React proptypes allow different types for a prop?
- Can I import an SVG file as a React component?
- Why are inline ref callbacks or functions not recommended?
- What is render hijacking in react?
- What are HOC factory implementations?
- How to pass numbers to React component?
- Do I need to keep my entire state in Redux? Should I ever use react internal state?
- What is the purpose of RegisterServiceWorker in React?
- What is React Memo function?
- What is react lazy function?
- How to prevent unnecessary updates using setstate?
- How do you represent arrays, strings and numbers in React 16 version?
- How to use class field declaration syntax in React classes?
- What are hooks?
- What rules does a hook need to follow?
- How to ensure that hooks follow the rules in your project?
- What are the differences between flux and redux?
- What are the benefits of React Router V4?
- Can you explain the ComponentDidCatch lifecycle method signature?
- In which scenarios do error bounds not catch errors?
- Why don’t you need error boundaries for event handlers?
- What is the difference between try catch block and error bounds?
- What is the behavior of uncaught errors in React 16?
- What is the proper location of error boundaries?
- What is the benefit of component stack trace over error bounds?
- What is the required method to define for a class component?
- What are the possible return types of the render method?
React JS Interview Questions On Virtual DOM
- What is Virtual DOM? How does React use Virtual DOM to render UI?Why was Virtual DOM introduced?
- How does this work?
- What are the differences between controlled and uncontrolled components?
- What are the error limits?
- What is the error range?
- Without using error bounds:
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