React job interview questions

Looking to land your dream job as a React developer? We've compiled a comprehensive guide of essential React job interview questions covering React fundamentals, components, state and lifecycle methods, Redux, hooks, performance optimization, and more. Prepare with confidence and ace your next interview.

QUESTION 1:

What is the difference between React and React Native?

React Junior

QUESTION 2:

How do you handle authentication and authorization in a React application?

React Junior

QUESTION 3:

How do you implement server-side rendering in a React application?

React Junior

QUESTION 4:

How do you handle errors in React applications?

React Junior

QUESTION 5:

What are some ways to optimize the performance of a React application?

React Junior

QUESTION 6:

What is side effect in React?

React Junior

QUESTION 7:

What are the most common options to store state in React?

React Junior

QUESTION 8:

What are the most commonly used React hooks?

React Junior

QUESTION 9:

How do you render lists in React?

React Junior

QUESTION 10:

Why do we need keys for React lists?

React Junior

QUESTION 11:

What are React fragments used for?

React Junior

QUESTION 12:

How do you pass data to React components?

React Junior

QUESTION 13:

How is React shadow DOM different than virtual DOM?

React Junior

QUESTION 14:

What is React virtual DOM?

React Junior

QUESTION 15:

What is React shadow DOM?

React Junior

QUESTION 16:

What are bundlers in React?

React Junior

QUESTION 17:

What is JSX in React?

React Junior

QUESTION 18:

What is prop drilling in React?

React Junior

QUESTION 19:

What are package managers in React?

React Junior

QUESTION 20:

What three dots mean in React code?

React Junior

QUESTION 21:

What are React hooks?

React Junior

QUESTION 22:

What is uncontrolled component in React?

React Junior

QUESTION 23:

What is a controlled component in React?

React Junior

QUESTION 24:

How is state different than props in React?

React Junior

QUESTION 25:

What are props in React?

React Junior

QUESTION 26:

What is mounted component in React?

React Junior

QUESTION 27:

Which methods would you use to handle events in React?

React Junior

QUESTION 28:

How would you avoid binding in React?

React Junior

QUESTION 29:

When would you use useMemo in React?

React Junior

QUESTION 30:

What method would you use to check and improve speed of React app?

React Junior

QUESTION 31:

Which methods would you use to conditionally add attribute to components in React?

React Junior

QUESTION 32:

How would you use validation on props?

React Junior

QUESTION 33:

Why would you use super constructors with props arguments in React?

React Junior

QUESTION 34:

In which situation would you use refs in React?

React Junior

QUESTION 35:

Why do you need to use refs in React?

React Junior

QUESTION 36:

What are refs in React?

React Junior

QUESTION 37:

What is better in React? Functional or class component?

React Junior

QUESTION 38:

What is difference between functional and class component?

React Junior

QUESTION 39:

What is class component in React?

React Junior

QUESTION 40:

What is functional component in React?

React Junior

QUESTION 41:

Do hooks replace high order components in React?

React Junior

QUESTION 42:

What happens if you attempt to update the state directly in React?

React Junior

QUESTION 43:

What are the React lifecycle stages?

React Junior

QUESTION 44:

What are 3 advantages of using React hooks?

React Junior

QUESTION 45:

How often does useState update in React?

React Junior

QUESTION 46:

What is useState() good for in React?

React Junior

QUESTION 47:

How do you install React?

React Junior

QUESTION 48:

How do you create a React app?

React Junior

QUESTION 49:

What is React?

React Junior

QUESTION 50:

Why would you recommend to use React?

React Junior

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