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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 votes6387 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
32 votes6350 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 votes5106 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 votes6448 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 votes4965 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
Easy
10 votes5104 runs1 comment

Find the issue with this React code:

Web developer
react
useCallback
Clément Devosat Jan 4, 2022
Easy
10 votes3987 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 votes2466 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
8 votes4869 runs0 comment

Which statement(s) are true about hooks?

Web developer
react
hooks
Clément DEVOSat Jan 4, 2022
Easy
8 votes2241 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 votes3760 runs
1 comment

How to optimize a React component to improve its performance?

Web developer
react
performance
Clément Devosat Jan 4, 2022
Easy
6 votes4491 runs
4 comments

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Easy
5 votes3705 runs2 comments

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

Web developer
react
ssr
Vincent Cotroat Jan 4, 2022
Medium
5 votes1043 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 votes883 runs0 comment

Render a list of string from an array in React

Web developer
array
map
Emilieat May 4, 2023
Easy
4 votes2051 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
Medium
3 votes1722 runs0 comment

Explain how the `memo` hook works in React

Web developer
react
functional components
Philippeat Mar 9, 2022
Medium
3 votes1209 runs1 comment

Fix the following React code:

Web developer
react
props
return
Vincent Cotroat Jun 13, 2022
Medium
2 votes794 runs1 comment

Write a React component that renders a list of numbers

Web developer
react
components
syntax
Enguerranat Nov 3, 2023
Hard
2 votes526 runs0 comment

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

Web developer
react
typescript
Dragon parfaitat Aug 26, 2024