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45 interview questions on React ⚛️for developers (2026)

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
36 votes6423 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
32 votes6383 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 votes5138 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
15 votes6485 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
11 votes4997 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
Medium
10 votes5135 runs1 comment

Find the issue with this React code:

Web developer
react
useCallback
Clément Devosat Jan 4, 2022
Easy
10 votes4015 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 votes2495 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
Anonymous authorat Apr 5, 2023
Easy
8 votes4899 runs0 comment

Which statement(s) are true about hooks?

Web developer
react
hooks
Clément DEVOSat Jan 4, 2022
Easy
8 votes2270 runs2 comments

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

Web developer
react
context
hooks
Anonymous authorat Nov 7, 2023
Easy
7 votes3789 runs
1 comment

How to optimize a React component to improve its performance?

Web developer
react
performance
Clément Devosat Jan 4, 2022
Easy
6 votes4517 runs
4 comments

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Easy
5 votes3735 runs2 comments

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

Web developer
react
ssr
Vincent Cotroat Jan 4, 2022
Medium
5 votes1074 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
Easy
5 votes892 runs0 comment

Render a list of string from an array in React

Web developer
array
map
Emilieat May 4, 2023
Easy
4 votes2077 runs
4 comments

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

Web developer
react
state
style
Anonymous authorat Apr 10, 2023
Medium
3 votes1734 runs0 comment

Explain how the `memo` hook works in React

Web developer
react
functional components
Philippeat Mar 9, 2022
Medium
3 votes1219 runs1 comment

Fix the following React code:

Web developer
react
props
return
Anonymous authorat Jun 13, 2022
Medium
2 votes802 runs1 comment

Write a React component that renders a list of numbers

Web developer
react
components
syntax
Enguerranat Nov 3, 2023
Hard
2 votes548 runs0 comment

Which statement(s) is/ are true about Typescript and React

Web developer
react
typescript
Anonymous authorat Aug 26, 2024