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JavaScript & NodeJS Online 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.

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Screen candidates with a 40 mins test

Test duration:  40 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 5 JavaScript MCQs
  • 5 NodeJS MCQs
  • 1 JavaScript Coding Question
Covered skills:
JavaScript Basics
JS ES6
JS OOPs
Handling APIs
Asynchronous Node.js and promises
Node.js Module System
Request Response Lifecycle
JavaScript Programming
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Use the JavaScript & NodeJS Test to shortlist qualified candidates

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
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Screen candidates with the highest quality 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 15,000+ questions. The actual questions on this JavaScript & NodeJS Test will be non-googleable.

🧐 Question

Medium

Async Await Promises
Promises
Async-Await
Solve
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
Solve
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
Solve
What will the output of the following JavaScript code be?
 image
 image

Medium

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

Easy

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

Medium

I/O cycle and main module
Event Loop
Solve
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
Solve
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
Solve
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

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
Solve
Given details of customers, products, and sales, write a SQL query to find the customer with the highest spend. The customer with the highest spend is the one who has spent the most money on purchases. The query should return the full name of the customer and the total amount spent by the customer rounded off to the nearest integer.
full_name is the concatenation of first_name and last_name separated by a space. Eg:
first_name = 'Alice', last _name = 'Brown' => full_name = 'Alice Brown'
You can assume that there will always be non-empty first_name and non-empty last_name entries for all customers in the table.
 image

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
Solve

Medium

Bitcoin prices
Axios
Promises

2 mins

JavaScript
Solve

Medium

My Module
Scope

2 mins

JavaScript
Solve

Medium

Promise Resolve
Promises
Async-Await

2 mins

JavaScript
Solve

Easy

Throw, Try, Async
Promises
Async-Await

2 mins

JavaScript
Solve

Medium

I/O cycle and main module
Event Loop

2 mins

NodeJS
Solve

Easy

Res methods

3 mins

NodeJS
Solve

Medium

Phases and Timers
Event Loop

2 mins

NodeJS
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY

10 mins

SQL
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Async Await Promises
Promises
Async-Await
JavaScript
Medium2 mins
Solve
Bitcoin prices
Axios
Promises
JavaScript
Medium2 mins
Solve
My Module
Scope
JavaScript
Medium2 mins
Solve
Promise Resolve
Promises
Async-Await
JavaScript
Medium2 mins
Solve
Throw, Try, Async
Promises
Async-Await
JavaScript
Easy2 mins
Solve
I/O cycle and main module
Event Loop
NodeJS
Medium2 mins
Solve
Res methods
NodeJS
Easy3 mins
Solve
Phases and Timers
Event Loop
NodeJS
Medium2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
SQL
Hard10 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve

Test candidates on core JavaScript & NodeJS Hiring Test topics

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.

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Have questions about the JavaScript & NodeJS Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours 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. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

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.

What roles can I use the JavaScript & NodeJS Test for?

Here are few roles for which we recommend this test:

  • Full Stack Web Developer
  • JavaScript Developer
  • NodeJS Developer
  • Web Developer
Can I see a sample test, or do you have a free trial?

Yes!

The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

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.

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.

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