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

security
JUNIOR
Tested skills
Duration
46 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Math, Probability, Soft Skills, Cybersecurity, Vulnerabilities, Web Security

Code gaps

assessing knowledge of Cybersecurity, Netcat, Reverseshell, Nmap, Portscan, Curl, Password, Protection

Testing task - Level: Easy

Cybersecurity | XSS Pastebin - In this challenge the contestant is given a task with a pastebin page which is prone to the XSS vulnerability at the administrator's portal. This enables the attacker to impersonate the administrator without knowing correct credentials.

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

Choice questions

assessing knowledge of JavaScript

Code gaps

assessing knowledge of JavaScript

Programming task - Level: Easy

JavaScript | Word search - Initialize the WordSearch object to hold the letterGrid and implement the find method that will search a given grid in all directions.

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

Choice questions

assessing knowledge of JS, JavaScript, React

Code gaps

assessing knowledge of JavaScript, React

Programming task - Level: Easy

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

Node.JS
MIDDLE
Tested skills
Duration
87 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, Node.JS

Code gaps

assessing knowledge of JavaScript, Node.JS, SQL

Programming task - Level: Medium

Node.JS | Rest API | News backend service - Implement a news backend service created in Node.JS with Vanilla JS including writing authorization and Rest APIs.

TypeScript
JUNIOR
Tested skills
Duration
51 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Typescript

Code gaps

assessing knowledge of JavaScript, React

Choice questions

assessing knowledge of HTML, CSS

Programming task - Level: Easy

TypeScript | React Hooks | Movies State Management - Complete movies management application using React Hooks by implementing state management to existing views.

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

Choice questions

assessing knowledge of JavaScript, Redux

Code gaps

assessing knowledge of HTML, HTML5, CSS

Programming task - Level: Medium

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

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

Choice questions

assessing knowledge of React Native

Code gaps

assessing knowledge of JavaScript, React Native

Programming task - Level: Medium

React Native | Cheeper - a new social media app - Finish the implementation so that basic socializing would be possible.

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

Choice questions

assessing knowledge of Angular, JavaScript, Typescript

Programming task - Level: Medium

JavaScript | Angular | Notepad App - Complete simple notes application using provided NotesService to save and read notes.

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

Choice questions

assessing knowledge of JavaScript, Typescript

Code gaps

assessing knowledge of JavaScript, Typescript

Programming task - Level: Medium

TypeScript | NestJS | My Barista App - Coffee Recommendation - Implement NestJS REST service for rating and recommending coffee types.

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

Choice questions

assessing knowledge of Typescript

Code gaps

assessing knowledge of JavaScript, Typescript

Programming task - Level: Medium

TypeScript | NestJS | My Barista App - Listing rated coffee types - Implement NestJS REST service for rating and recommending coffee types.

TypeScript
JUNIOR
Tested skills
Duration
46 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, Typescript

Code gaps

assessing knowledge of JavaScript, Typescript

Programming task - Level: Easy

TypeScript | NestJS | My Barista App - Fetch rating of a coffee type - Implement a new feature for listing previously rated coffee types in the NestJS REST service for rating coffee types.

Selenium
SENIOR
Tested skills
Duration
81 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of QA, .NET, C#, Selenium

Code gaps

assessing knowledge of QA .NET, C#, Selenium

Programming task - Level: Hard

QA | .NET | Selenium, C#, JavaScript | Home Page Testing - Implement solutions based on your knowledge of testing cookies and the JavaScript methods from the Selenium using C# and checking browser tabs from the Selenium.

Node.JS
JUNIOR
Tested skills
Duration
41 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, Node.JS

Code gaps

assessing knowledge of JavaScript, Node.JS

Programming task - Level: Easy

JavaScript | Node.JS | File system - Use NodeJS to read/write files in sync and async way, list directories recursively.

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

Programming task - Level: Hard

HTML/CSS | Home Page - Complete CSS property definitions so the page displays the appropriate splash loader screen before it displays the home page.

Programming task - Level: Hard

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

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

Choice questions

assessing knowledge of Angular, JavaScript

Code gaps

assessing knowledge of Angular, JavaScript

Programming task - Level: Medium

JavaScript | Angular | Reactive forms - Prepare a registration form using Reactive forms

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

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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