JavaScript coding interview questions and tests

JavaScript is a must-have for every front-end developer. The tasks of the front-end developer nowadays require using a wide range of tools and knowing multiple programming languages. You can check the skills of your candidate using our JavaScript coding interview questions and tests to have a good understanding of how proficient they are.

The developer has to combine the knowledge of JavaScript with at least one of the popular frameworks like Angular, React or Vue. With Devskiller JavaScript coding interview questions and tests you can identify developers with the exact skill set you need to grow your company.

JavaScript Coding Interview Questions:

Programming language: JavaScript

Java frameworks and libraries: Angular, AngularJS, React, Ember, Backbone, Meteor, jQuery and others

Build tools: NPM, Gulp, Bower

JavaScript
SENIOR
Tested skills
Duration
46 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Hard

JavaScript | Functional memoization - Write the two versions of generic memoization mechanism.

Available in Team and Enterprise plans

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TypeScript
SENIOR
Tested skills
Duration
105 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Typescript

Programming task - Level: Hard

TypeScript | Social Media Queries | Find friends by name - Implement the funtion FriendsQueries#queryByNameMatching per the requirements and make all tests pass.

Available in Team and Enterprise plans

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React
SENIOR
Tested skills
Duration
175 minutes max.
Evaluation
Automatic
Test overview

Front End programming task - Level: Senior

JavaScript | React, Redux | Address Book - Implement missing features of a small React web application built on top of Redux.

Back end programming task - Level: Medium

JavaScript | Node.js | Address Book - Implement endpoints to fetch the list of contacts (with a phase matching and results limiting), fetch details of a single contact and to delete the given contact.

Available in Team and Enterprise plans

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React
JUNIOR
Tested skills
Duration
35 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, React

Programming task - Level: Easy

Javascript | React | Calendar Notes - Implement an application with which the user can add a note for a date they choose from a calendar.

Available in Team and Enterprise plans

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JavaScript
JUNIOR
Tested skills
Duration
35 minutes max.
Evaluation
Automatic
Test overview

Code gaps

assessing knowledge of JavaScript

Programming task - Level: Easy

jQuery | DOM manipulation - basic form - Implement an interactive form to allow editing and calculating the simple statistics.

Available in Team and Enterprise plans

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JavaScript
MIDDLE
Tested skills
Duration
51 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript

Programming task - Level: Medium

jQuery | DOM manipulation - Implement interactive form to allow editing, confirming tasks, disabling inputs and calculating statistics.

Available in Team and Enterprise plans

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React Native
SENIOR
Tested skills
Duration
108 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Hard

React Native | Movie Store - Implement an application which allows users to buy all the movies they can imagine.

Available in Team and Enterprise plans

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JavaScript
JUNIOR
Tested skills
Duration
35 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, React

Programming task - Level: Easy

JavaScript | React | Search-Engine Application - Implement an application to search and filter products in an online shop.

Available in Team and Enterprise plans

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Angular
MIDDLE
Tested skills
Duration
72 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Angular Forms API, Angular Reactive Forms, Angular2+, Angular Templates, Angular Security

Programming task - Level: Medium

JavaScript | Angular 2+ | Signup Form - Connect HTML/CSS to Angular and add proper validation.

Available in Team and Enterprise plans

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React Native
MIDDLE
Tested skills
Duration
101 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Medium

React Native | HR Companion App - Implement an application to help HR department with maintaining the list of job candidates to be evaluated.

Available in Team and Enterprise plans

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React Native
JUNIOR
Tested skills
Duration
70 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Easy

React Native | Ultimate BugTracker - Implement missing features and fix bugs in the application used as an in-house bug tracker of a software house.

Available in Team and Enterprise plans

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The best roles for a JavaScript software developer:

Recommended roles for JavaScript developers include:

  • Web developer
  • Full stack developer
  • Front end developer
  • WordPress developer
  • Full stack engineer
  • Junior web developer
  • Junior front end developer
  • Front end engineer
  • JavaScript Developer
  • Mean stack developer
  • React developer
  • Angular developer

How our online JavaScript tests work

Using the RealLifeTesting™ methodology, Devskiller’s online JavaScript tests help put your candidate in a natural environment to examine their coding skills. Give them access to all the tools they need to complete a range of tasks that they’d face regularly as a developer in your company. 

Create deadlines and build a range of scenarios and tasks to help measure and asses your candidates’ problem-solving and technical thinking. Pick from React, Angular, or just about any other resource in the JavaScript tech stack.

Key features

  • Asses candidates JavaScript coding skills in an environment you’ve designed and measure their coding abilities, rather than academic merit
  • Test JavaScript developers anywhere in the world at any time of day
  • A natural coding environment where your candidate has access to all the tools they have available in the job you’re hiring for
  • Automatically create a report that’s easy to read and comprehend for non-technical recruiters
  • Verify the integrity of your candidate’s work with robust and complex plagiarism controls

What to look for in JavaScript Developers

JavaScript is one of the most widely used languages out there, regularly being used in both front-end and back-end applications. Even the most basic knowledge of the language can change the entire behavior of an entire website. However this is as a recruiter, you need to be aware. Many JavaScript developers learn JavaScript to problem solve, so the underpinning knowledge is lacking.

To write to a high standard, a JavaScript developer must have a comprehensive knowledge of the entire language and what it can and can’t do. One must also have knowledge and experience of the specific libraries and frameworks that the role requires – of which there are many, each being suited to different applications. 

Don’t see what you want?

Can’t find the ideal JavaScript test to give to your applicants? No problem. Our task wizard lets you create your own JavaScript coding test using your very own resources. Throw your developer into the world of jQuery, React, Angular and many many more applications. Test your candidates at any time from anywhere in the world.