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 test interview questions and tests you can identify developers with the exact skill set you need to grow your company.

JavaScript Coding test Interview Questions:

Programming language: JavaScript

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

Build tools: NPM, Gulp, Bower

Angular 2+
SENIOR
Tested skills
Duration
53 minutes max.
Evaluation
Automatic
Test overview

Code gaps

assessing knowledge of Angular2+, JavaScript

Choice questions

assessing knowledge of HTML

Programming task - Level: Hard

JavaScript | Angular 2+ | Router Role Based Access Control - Prepare a simple RBAC for routes and components.

Vue.js
MIDDLE
Tested skills
Duration
70 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, Vue.js

Programming task - Level: Medium

JavaScript | Vue.js | Contact Form - Finish the form so it has all the following features: user can log in, so name and email are filled-in after the form is sent a 'Thank You' message should appear.

TypeScript
MIDDLE
Tested skills
Duration
65 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Typescript

Programming task - Level: Medium

TypeScript | Redux Selectors | HR Department - Implement Redux Selectors which will process HR data. Implementation will be tested against snapshot tests.

Angular
JUNIOR
Tested skills
Duration
58 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Angular2+, JavaScript, rxjs

Programming task - Level: Easy

JavaScript | Angular 2+ | Virtual business cardholder - Connect components of the virtual cardholder using a service, RxJS, and Angulars @Input.

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

Programming task - Level: Hard

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

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.

Code gaps

assessing knowledge of MongoDB

Java
JUNIOR
Tested skills
Duration
120 minutes max.
Evaluation
Automatic
Test overview

Front End programming task - Level: Easy

JavaScript | TypeScript | Invoice application - frontend - Implement the front-end part for merging and aggregating the invoice data with currency exchange rates.

Back End programming task - Level: Easy

Java | Invoice application - backend - Implement the backend part for searching and aggregating invoice data with the service and the DAO methods.

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

Choice questions

assessing knowledge of ES6, JavaScript, HTML, CSS, Accessibility

Programming task - Level: Hard

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

Angular
JUNIOR
Tested skills
Duration
44 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Angular2+, JavaScript

Code gaps

assessing knowledge of Angular2+, JavaScript

Programming task - Level: Easy

JavaScript | Angular 2+ | Currency Calculator - Finish an application that should convert the amount of money in selected currency to USD.

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

Choice questions

assessing knowledge of JavaScript, Redux

Programming task - Level: Easy

JavaScript | Redux | HR Department - reducers - Implement correctly the redux reducers and selectors.

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.

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.

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.

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.

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.

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.

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.

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

Choice questions

assessing knowledge of ES6, JavaScript

Programming task - Level: Easy

JavaScript | Orders Analyzer | Find a total ordered quantity of a product for every weekday - Implement OrdersAnalyzer#averageDailySales method that will return a map with a name of a day of the week as a key and a sum of ordered quantity for a given product id as a value.

The best JavaScript programming questions 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 and JavaScript coding questions work

Using the RealLifeTesting™ methodology, DevSkiller’s online JavaScript coding interview questions 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 assess your candidates’ problem-solving and technical thinking. Pick from JavaScript coding interview questions in React, Angular, or just about any other resource in the JavaScript tech stack.

Key features

  • JavaScript coding interview questions assess candidates’ JavaScript coding skills in an environment you’ve designed and measure their coding abilities, rather than academic merit
  • Test JavaScript developers with JavaScript coding interview questions 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 in our JavaScript programming questions 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 code 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. This is exactly what DevSkiller JavaScript programming questions test.

Don’t see what you want?

Can’t find the ideal JavaScript test with the right JavaScript programming questions to give to your applicants? No problem. Our task wizard lets you create your own JavaScript coding test and JavaScript coding test interview questions 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.

Want proof that our JavaScript coding interview questions and tests really work?

It is understandable to be a little hesitant before committing your company’s money to our screening tool. After all, what assurances do you have that our JavaScript coding tests are what your company needs to help with its recruitment? Don’t take our word for it, read what our clients have had to say about their experience using our screening tool:

Jonatan Rugarn – CEO, Founder, Recruiter at Lingonberry Talent Acquisition, Engineering Manager at Avinode Group

“The duration of the recruitment process has not changed, but we spend less time and effort per candidate. We also don’t waste time on the wrong candidates.

Michael Gerwig – Engineering manager at Ada Health

“DevSkiller helped us to save precious on-site time for applicants that are already likely to be a fit. We’re saving 3 hours per candidate – that was the time we spent with applicants on a technical task before.”

Ivana Nikolic – HR Manager at ImpacTech

“The greatest advantage for the candidates is that they can proceed with the tests at their own convenience. In case you have a candidate who is already working and is thinking about changing the career or moving to another company, it is also a time saver for them, as they do not have to take time off in order to attend numerous interviews in the search for a new position.”

Frequently asked questions

What’s the duration of JavaScript coding interview questions and tests?

The duration of each JavaScript test is really up to the recruiter to decide. Test lengths are flexible and can be changed to fit your preferences. You have DevSkiller’s default settings to choose from or can set a custom duration.

How do the candidates feel about our JavaScript coding interview questions and tests?

One of the reasons we are so confident in our screening tool is the feedback we have had from developer candidates after taking our tests. Candidates regularly tell us they love having the chance to prove their actual software development skills for a change.

Developer candidates often dislike traditional coding tests, because they have to remember algorithms they simply don’t use in their everyday work. These don’t reflect their actual skills on the job. DevSkiller testing is different and developers appreciate the chance to use normal coding tools and conventions. They can run unit tests, and clone their projects to GIT from their personal IDE, just like in their real work. Our tests better reflect the work developers actually do and they appreciate being given that chance.

How do candidates take JavaScript coding tests?

One of the many benefits of our DevSkiller JavaScript online tests is they can be carried out remotely. In a world becoming more and more tailored to remote work, it makes sense that DevSkiller JavaScript coding tests can be taken from anywhere and at any time. Not only is this more convenient for the candidates, but it will save your business countless hours and money spent on in-house testing. A recruiter only needs to do is send out a JavaScript test invite and the candidates can get started wherever they are.

During testing, candidates have the option to use DevSkiller’s own state-of-the-art, in-browser IDE, or if they’d rather, they can complete the project on their favorite IDE and then clone the project to GIT. Candidates can also run unit tests if required.

How are JavaScript coding interview questions evaluated?

The biggest advantage of our JavaScript coding tests is that they are evaluated automatically. This saves recruiters countless hours scoring tests during the screening phase of recruitment.

With DevSkiller, once the test is completed by the candidate, the DevSkiller platform automatically gets to work assessing the answers.

Results are then compiled into a clear and easy-to-understand report. Meaning all the recruiter has done, is to send out a test invite and then sit and wait for the results to pour in.

Assessment is based on the solutions the candidate provides if there are any errors in their code, and how the solution works in edge cases. We also ensure test accuracy, by introducing a number of anti-plagiarism tools.

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