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JavaScript & NodeJS Online Test

About the test:

The JavaScript Node Online Test uses scenario-based MCQs to evaluate candidates on their understanding of JavaScript programming for server-side development using Node.js. The test assesses candidates on their knowledge of Node.js architecture, features, and functionalities, including modules, events, streams, and file system. It also evaluates their familiarity with the Node.js ecosystem, such as the Node Package Manager (NPM), Express.js, and Socket.IO, and their ability to build RESTful APIs using Node.js.

Covered skills:

  • JavaScript Basics
  • JS OOPs
  • Asynchronous Node.js and promises
  • Request Response Lifecycle
  • JS ES6
  • Handling APIs
  • Node.js Module System
  • JavaScript Programming

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9 reasons why
9 reasons why

Adaface JavaScript & NodeJS Test is the most accurate way to shortlist Full Stack Web Developers



Reason #1

Tests for on-the-job skills

The JavaScript & NodeJS Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Understanding the basic syntax and functions of JavaScript
  • Working with ES6 features in JavaScript
  • Implementing Object-Oriented Programming concepts in JavaScript
  • Handling APIs and making HTTP requests in JavaScript
  • Working with asynchronous programming and promises in Node.js
  • Understanding the Node.js module system and using npm packages
  • Understanding the request-response lifecycle in Node.js
  • Proficient in JavaScript programming
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
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Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this JavaScript & NodeJS Test will be non-googleable.

🧐 Question

Medium

Async Await Promises
Promises
Async-Await
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What will the following code output?
 image
A: 24 after 5 seconds and after another 5 seconds, another 24
B: 24 followed by another 24 immediately
C: 24 immediately and another 24 after 5 seconds
D: After 5 seconds, 24 and 24
E: Undefined
F: NaN
G: None of these

Medium

Bitcoin prices
Axios
Promises
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Review the following JavaScript code and pick the correct options: 
 image
Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?

Medium

My Module
Scope
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What will the output of the following JavaScript code be?
 image
 image

Medium

Promise Resolve
Promises
Async-Await
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What does the following code output? 
 image

Easy

Throw, Try, Async
Promises
Async-Await
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What does the following JS code output?
 image

Medium

I/O cycle and main module
Event Loop
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Review the following NodeJS code:
 image
Pick the correct statements:

A: X will be logged after Y always
B: Y will be logged after X always
C: The order of executing timeout and immediate callbacks is non-deterministic and is bound by the performance of the process
D: In this case, the function calls are scheduled in the main module and not in the I/O cycle
E: In this case, the function calls are scheduled in the I/O cycle so setImmediate is always executed before any timers scheduled in the I/O phase, independently of how many timers are left

Easy

Res methods
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If none of the methods (res.download, res.end, res.json, res.jsonp, res.redirect, res.render, res.send, res.sendFile, res.sendStatus) are called from a route handler to terminate request response cycle, what happens to the the client request?
A) Will be left hanging indefinitely

B) Will get an internal server error - 500 

C) Will get a service unavailable error - 503

D) Will be left hanging for a while and then request timeout error - 408

Medium

Phases and Timers
Event Loop
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Review the following NodeJS code:
 image
Pick the correct statements:

A: Adaface will be logged after Lovelace.
B: Lovelace will be logged after Adaface.
C: Once the asyncOpThatTakes195ms completes reading the file, it starts executing the callback which takes 10 seconds. Only after this is finished, the event loop will execute the timers that are finished. So the timeout call back will actually be executed after 205 ms even though it is scheduled to be run after 200 ms
D: Once the asyncOpThatTakes195ms completes reading the file, it starts executing the callback. While executing the callback, the scheduled timer becomes ready to be executed. So the runtime executes the timer and then completes processing the callback.

Easy

Registration Queue
Logic
Queues
Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.
For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.
⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

Medium

Visitors Count
Strings
Logic
Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 
Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 
⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.
🧐 Question🔧 Skill

Medium

Async Await Promises
Promises
Async-Await

2 mins

JavaScript
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Medium

Bitcoin prices
Axios
Promises

2 mins

JavaScript
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Medium

My Module
Scope

2 mins

JavaScript
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Medium

Promise Resolve
Promises
Async-Await

2 mins

JavaScript
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Easy

Throw, Try, Async
Promises
Async-Await

2 mins

JavaScript
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Medium

I/O cycle and main module
Event Loop

2 mins

NodeJS
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Easy

Res methods

3 mins

NodeJS
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Medium

Phases and Timers
Event Loop

2 mins

NodeJS
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Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Async Await Promises
Promises
Async-Await
JavaScript
Medium2 mins
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Bitcoin prices
Axios
Promises
JavaScript
Medium2 mins
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My Module
Scope
JavaScript
Medium2 mins
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Promise Resolve
Promises
Async-Await
JavaScript
Medium2 mins
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Throw, Try, Async
Promises
Async-Await
JavaScript
Easy2 mins
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I/O cycle and main module
Event Loop
NodeJS
Medium2 mins
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Res methods
NodeJS
Easy3 mins
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Phases and Timers
Event Loop
NodeJS
Medium2 mins
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Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment JavaScript & NodeJS Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the JavaScript & NodeJS Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
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Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the JavaScript & NodeJS Assessment Test

Why you should use Pre-employment JavaScript & NodeJS Online Test?

The JavaScript & NodeJS Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Understanding of JavaScript basics and syntax
  • Knowledge of JavaScript ES6 features and enhancements
  • Proficiency in JavaScript Object-Oriented Programming principles
  • Experience in handling APIs and making AJAX requests
  • Understanding of asynchronous programming in Node.js using promises
  • Knowledge of Node.js module system and implementing modular code
  • Familiarity with the request-response lifecycle in Node.js
  • Proficiency in JavaScript programming and problem-solving
  • Ability to implement and work with JavaScript data structures
  • Knowledge of JavaScript functional programming concepts

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the JavaScript & NodeJS Online Test?

  • JavaScript Basics

    This skill covers the fundamental concepts of JavaScript programming, including data types, variables, operators, control flow statements, and functions. It is important to measure this skill in the test to assess the candidate's understanding of the language basics, which forms the foundation for more advanced concepts.

  • JS ES6

    JS ES6 refers to ECMAScript 6, which introduced various new features and syntax enhancements to JavaScript. This skill measures the candidate's knowledge of modern JavaScript techniques like arrow functions, template literals, destructuring, and modules.

  • JS OOPs

    This skill evaluates the candidate's understanding of object-oriented programming (OOP) concepts in JavaScript, such as classes, objects, inheritance, encapsulation, and polymorphism. It is essential to measure this skill to assess the candidate's ability to write modular and reusable code using OOP principles.

  • Handling APIs

    This skill assesses the candidate's capability to interact with web APIs using JavaScript. It measures their proficiency in making HTTP requests, handling responses, parsing JSON data, and error handling. Testing this skill is crucial as it reflects the candidate's ability to work with external data sources and integrate them into applications.

  • Asynchronous Node.js and promises

    This skill evaluates the candidate's knowledge of asynchronous programming in Node.js, utilizing concepts such as callbacks and promises. It measures their ability to write non-blocking code and handle asynchronous tasks efficiently. Testing this skill is important as it is a fundamental aspect of Node.js development and ensures the candidate can solve complex problems efficiently.

  • Node.js Module System

    The Node.js module system is a key skill that encompasses the knowledge of importing and exporting modules in Node.js applications. This skill measures the candidate's understanding of how to structure and organize code using modules, encouraging code reusability and maintainability.

  • Request Response Lifecycle

    This skill evaluates the candidate's comprehension of the life cycle of a request and response in a Node.js web application. It covers concepts such as handling incoming requests, processing data, managing middleware, and sending appropriate responses. Testing this skill helps assess the candidate's understanding of the flow of data in a Node.js application and their ability to build robust, efficient web applications.

  • JavaScript Programming

    This skill encompasses the overall aptitude of the candidate in JavaScript programming. It covers their proficiency in solving programming challenges, writing clean and readable code, understanding complex algorithms, and applying best practices. Testing this skill ensures the candidate has a strong foundation in JavaScript programming and can contribute effectively to JavaScript-based projects.

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for JavaScript & NodeJS Test to be based on.

    Variables
    Functions
    Data types
    Operators
    Control flow
    Arrays
    Objects
    Strings
    Arrow functions
    Template literals
    Block scope
    Destructuring
    Spread and rest operators
    Classes
    Inheritance
    Encapsulation
    Polymorphism
    Promises
    Async/await
    Fetch API
    XHR
    JSON data manipulation
    Handling errors and exceptions
    File system
    Events and event emitters
    Streams
    Modules
    Package.json
    NPM commands
    Routing
    Middleware
    HTTP methods
    Request headers
    Response status codes
    Cookies
    CORS
    Authentication and authorization
    Caching
    Security
    Testing methodologies
    Debugging techniques
    Code optimization
    Code organization
    Resource management
    Performance optimization
    Error handling in Node.js
    Working with databases
    REST API development
    Integration with external APIs
    Concurrency and parallelism
    Event-driven programming
    Callback functions
    Data manipulation and transformation
    Module exports
    Event loop
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What roles can I use the JavaScript & NodeJS Online Test for?

  • Full Stack Web Developer
  • JavaScript Developer
  • NodeJS Developer
  • Web Developer

How is the JavaScript & NodeJS Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Understanding of JavaScript closures and scope
  • Experience in working with JavaScript libraries and frameworks
  • Knowledge of secure coding practices in JavaScript
  • Proficiency in debugging and troubleshooting JavaScript code
  • Ability to optimize JavaScript code for performance
  • Understanding of event-driven architecture in Node.js
  • Experience in working with file system operations in Node.js
  • Knowledge of database integration with Node.js
  • Proficiency in building RESTful APIs using Express.js framework
  • Understanding of web sockets and real-time communication in Node.js

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

JavaScript & NodeJS Hiring Test FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

Ready to use the Adaface JavaScript & NodeJS Test?
Ready to use the Adaface JavaScript & NodeJS Test?
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40 min tests.
No trick questions.
Accurate shortlisting.
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