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React Developer Interview Questions

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3,476 react developer interview questions shared by candidates

Can you explain the concept of Virtual DOM and how it is used in React? What are the differences between state and props in React? How would you handle asynchronous operations in React? Can you explain the purpose of React Router and how it is used? What is the significance of key props in React lists? How do you manage state in React? Explain the useState hook. What are React lifecycle methods? Can you describe their purpose and usage? How would you optimize the performance of a React application? Can you explain the concept of controlled components in React? How does React differ from other JavaScript frameworks like Angular or Vue?
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React Developer

Interviewed at Amazon

3.5★
Jun 16, 2023

Can you explain the concept of Virtual DOM and how it is used in React? What are the differences between state and props in React? How would you handle asynchronous operations in React? Can you explain the purpose of React Router and how it is used? What is the significance of key props in React lists? How do you manage state in React? Explain the useState hook. What are React lifecycle methods? Can you describe their purpose and usage? How would you optimize the performance of a React application? Can you explain the concept of controlled components in React? How does React differ from other JavaScript frameworks like Angular or Vue?

The first silly question : how can you check the object is null or not without if condition. not even single Question on React JS, because the interviewer is not knowing the React and try to Question in Angular. overall worst experience. The first silly question : how can you check the object is null or not without if condition. not even single Question on React JS, because the interviewer is not knowing the React and try to Question in Angular. overall worst experience.
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React Developer Javascript

Interviewed at Wissen Infotech

3.8★
Oct 17, 2018

The first silly question : how can you check the object is null or not without if condition. not even single Question on React JS, because the interviewer is not knowing the React and try to Question in Angular. overall worst experience. The first silly question : how can you check the object is null or not without if condition. not even single Question on React JS, because the interviewer is not knowing the React and try to Question in Angular. overall worst experience.

The interview process was good. The interviewer was professional and asked me to show a 360° view of my surroundings during the interview. They asked questions about: Native mobile development Biometrics React Hooks (useMemo, useCallback) Performance debugging in React Native I was also given a sample e-commerce implementation task and asked to implement the UI in a React Native sandbox environment.
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React Native Developer

Interviewed at Publicis Sapient

3.4★
Oct 30, 2025

The interview process was good. The interviewer was professional and asked me to show a 360° view of my surroundings during the interview. They asked questions about: Native mobile development Biometrics React Hooks (useMemo, useCallback) Performance debugging in React Native I was also given a sample e-commerce implementation task and asked to implement the UI in a React Native sandbox environment.

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