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45 interview questions on React ⚛️for developers (2025)

Test your technical skills before an interview of React ⚛️ with 45 corrected questions. Beginner, Intermediate or Expert level.

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45 questions
Easy
29 votes5750 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
25 votes5736 runs1 comment

Write the missing code to render the children of the UserProfile component.

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
16 votes4498 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Medium
15 votes5877 runs
2 comments

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
14 votes5811 runs
2 comments

Save the state used to display the selected page in a React component.

Web developer
state
react
Clément Devosat Nov 7, 2023
Easy
10 votes1916 runs0 comment

Write a React component that updates the document title with each click and resets to 'React App' when the component unmounts.

Web developer
react
hooks
useState
Vincent Cotroat Apr 5, 2023
Easy
9 votes4394 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
Easy
9 votes3457 runs0 comment

Write a React component that displays the sum of two numbers

Web developer
react
components
state
Vincent Cotroat Jan 4, 2022
Medium
8 votes4495 runs1 comment

Find the issue with this React code:

Web developer
react
useCallback
Clément Devosat Jan 4, 2022
Easy
8 votes1694 runs2 comments

Use the `useContext` hook to render a button with a dark theme.

Web developer
react
context
hooks
Vincent Cotroat Nov 7, 2023
Easy
7 votes4287 runs0 comment

Which statement(s) are true about hooks?

Web developer
react
hooks
Clément DEVOSat Jan 4, 2022
Hard
7 votes4216 runs1 comment

Write a React component that displays the number 2

Web developer
react
state
useState
Vincent Cotroat Jan 4, 2022
Easy
7 votes3952 runs
3 comments

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Easy
7 votes3207 runs
1 comment

How to optimize a React component to improve its performance?

Web developer
react
performance
Clément Devosat Jan 4, 2022
Easy
4 votes3132 runs2 comments

What are the advantages of SSR(server side rendering)?

Web developer
react
ssr
Vincent Cotroat Jan 4, 2022
Easy
3 votes1556 runs0 comment

Explain how the `memo` hook works in React

Web developer
react
functional components
Philippeat Mar 9, 2022
Easy
3 votes1514 runs
4 comments

Change the style of a button using the `useState` hook in React.

Web developer
react
state
style
Vincent Cotroat Apr 10, 2023
Easy
3 votes725 runs0 comment

Render a list of string from an array in React

Web developer
array
map
Emilieat May 4, 2023
Medium
3 votes589 runs0 comment

How to update the state based on its current value in a React functional component?

Web developer
hooks
state
concurrency
Rémi PHILIPPOTat Aug 23, 2024
Medium
2 votes1073 runs1 comment

Fix the following React code:

Web developer
react
props
return
Vincent Cotroat Jun 13, 2022