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841 interview questionsfor Front-end developer (2025)

Test your technical skills before an interview of Front-end developer with 841 corrected questions. Beginner, Intermediate or Expert level.

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841 questions
Medium
91 votes3600 runs5 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Easy
37 votes3297 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
29 votes3422 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
28 votes5677 runs0 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
25 votes5669 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 votes3421 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Camilleat Apr 27, 2023
Easy
20 votes1682 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Léoat Mar 29, 2022
Easy
16 votes3387 runs
3 comments

Which provider is recommended for DOM manipulation in Angular?

Web developer
angular
dom
Anonymous authorat Jan 4, 2022
Medium
15 votes5804 runs
1 comment

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
15 votes4434 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
14 votes5740 runs1 comment

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

Web developer
state
react
Clément Devosat Nov 7, 2023
Medium
14 votes3349 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
12 votes1159 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
Medium
12 votes423 runs0 comment

How to create a two column layout with Bootstrap?

Web developer
Maxime Javauxat Apr 19, 2024
Easy
11 votes1149 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
Easy
10 votes3902 runs
5 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Kahinaat Apr 6, 2022
Easy
10 votes3722 runs
3 comments

Use spread operator to split an array into two arrays in Javascript

Web developer
array
spread operator
Kahinaat Jul 19, 2024
Easy
10 votes3662 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
10 votes1851 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
10 votes1565 runs
3 comments

Specify the location in the DOM where the component of the active route will be inserted in Angular

Web developer
angular
router
Léoat Mar 29, 2022
Front-end developer tests