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62 interview questions on Reactfor developers (2026)

Test your technical skills before an interview of React with 62 corrected questions. Beginner, Intermediate or Expert level.

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62 questions
Easy
35 votes6312 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
29 votes6276 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
18 votes5034 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Medium
17 votes6491 runs
2 comments

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
15 votes6377 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
Medium
11 votes4896 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
Easy
10 votes3923 runs0 comment

Write a React component that displays the sum of two numbers

Web developer
react
components
state
Vincent Cotroat Jan 4, 2022
Easy
10 votes2397 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
Medium
8 votes5033 runs1 comment

Find the issue with this React code:

Web developer
react
useCallback
Clément Devosat Jan 4, 2022
Easy
8 votes4800 runs0 comment

Which statement(s) are true about hooks?

Web developer
react
hooks
Clément DEVOSat Jan 4, 2022
Easy
8 votes2170 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 votes3692 runs
1 comment

How to optimize a React component to improve its performance?

Web developer
react
performance
Clément Devosat Jan 4, 2022
Hard
7 votes1566 runs0 comment

How to submit a form in React

Web developer
form
submit
Victor Sabatierat Feb 3, 2022
Hard
7 votes1538 runs0 comment

Optimize a React component by implementing shouldComponentUpdate

Web developer
react
array
shouldComponentUpdate
Clément Devosat Feb 3, 2022
Easy
7 votes1526 runs0 comment

Improve this React component so that it displays "Green" by default.

Web developer
react
state
component
Victor Sabatierat Feb 3, 2022
Easy
6 votes4425 runs
4 comments

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Hard
6 votes1541 runs0 comment

Write a React function that fetches comments and passes them to a component.

Web developer
react
components
Victor Sabatierat Feb 3, 2022
Easy
5 votes3637 runs2 comments

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

Web developer
react
ssr
Vincent Cotroat Jan 4, 2022
Medium
5 votes973 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
4 votes1565 runs0 comment

Fix the following React component: Scroller

Web developer
react
event
performance
Victor Sabatierat Feb 3, 2022
React tests