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850 interview questionsfor Front-end developer (2025)

Test your technical skills before an interview of Front-end developer with 850 corrected questions. Beginner, Intermediate or Expert level.

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850 questions
Medium
107 votes4138 runs
6 comments

Understanding the differences between `map()` and `forEach()` methods in JavaScript

Web developer
Vincent Cotroat Jan 18, 2024
Easy
48 votes3787 runs4 comments

Write a JavaScript function that fetches data from an API and logs it to the console.

Web developer
promises
async
Vincent Cotroat Mar 28, 2023
Easy
34 votes6126 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
30 votes3891 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Anonymous authorat Apr 27, 2023
Easy
30 votes3723 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
26 votes6102 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
23 votes1961 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Léoat Mar 29, 2022
Easy
18 votes4863 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
18 votes1090 runs1 comment

Load blog post data at build time for a static render.

Web developer
nextjs
static site generation
Anasat Nov 30, 2023
Medium
17 votes6297 runs
2 comments

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
17 votes3688 runs
3 comments

Which provider is recommended for DOM manipulation in Angular?

Web developer
angular
dom
Anonymous authorat Jan 4, 2022
Medium
16 votes3655 runs
3 comments

Which of these methods, allowing to create Providers, does not exist in Angular?

Web developer
angular
providers
Anonymous authorat Mar 28, 2023
Easy
14 votes6203 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
Hard
14 votes639 runs0 comment

How to create a two column layout with Bootstrap?

Web developer
Maxime Javauxat Apr 19, 2024
Easy
13 votes4065 runs
1 comment

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

Web developer
booleans
conditionals
Adrienat Mar 30, 2022
Easy
13 votes1369 runs0 comment

Which of the following utility types makes all properties of a given type optional?

Web developer
typescript
types
Vincent Cotroat Mar 29, 2023
Easy
13 votes1160 runs0 comment

What is the path to the about page in Next.js?

Web developer
nextjs
routes
Anasat Nov 30, 2023
Easy
12 votes4324 runs
5 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Kahinaat Apr 6, 2022
Easy
12 votes1356 runs0 comment

Define a custom type that represents a coordinate with an x and y property of type number in Typescript

Web developer
typescript
type
Vincent Cotroat Mar 31, 2023
Medium
11 votes4736 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
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