Node.js Online Test

Q: What are the main JavaScript tests?

Some important JavaScript-related tests are: JavaScript Online Test JavaScript, HTML/CSS & NodeJS Test JavaScript & React Test JavaScript, NodeJS & SQL Test

The NodeJS Online Test uses scenario-based MCQ questions to evaluate a candidate's ability to use Express.js as web application framework, handle REST API in Node, structure the Node application in modules, use NPM packages, connect to SQL/ Mongo databases and deploy node apps to production. The test uses code-tracing MCQ questions and coding questions to evaluate hands-on JavaScript programming skills.

Covered skills:

Node.js Module System
File System and Command Line Args
Debugging Node.js
Asynchronous Node.js and promises
REST APIs and web servers
API Authentication and Security
Testing and releasing Node.js
NPM package system
Node Middlewares
Event Loop and Timers
In-depth express js framework

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About the Node.js Test

The Node.js 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 and implementing Node.js Module System
Working with File System and Command Line Args in Node.js
Proficient in Debugging Node.js applications
Handling Asynchronous operations in Node.js using Promises
Creating REST APIs and web servers using Node.js
Implementing API Authentication and Security in Node.js
Testing and releasing Node.js applications
Experience with NPM package system
Working with Node Middlewares
Understanding Event Loop and Timers in Node.js
In-depth knowledge of Express.js framework

1200+ customers in 80 countries

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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 15,000+ questions. The actual questions on this Node.js Online Test will be non-googleable.

🧐 Question
Medium I/O cycle and main module Event Loop Async/await Concurrency Exception Handling	Solve
Review the following NodeJS code: 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 Error Handling Troubleshooting	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 Asynchronous Programming Event Handling	Solve
Review the following NodeJS code: 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 Sorting By Custom Order	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 String Parsing Character Counting	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 I/O cycle and main module Event Loop Async/await Concurrency Exception Handling	2 mins NodeJS	Solve
Review the following NodeJS code: 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 Error Handling Troubleshooting	3 mins NodeJS	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 Asynchronous Programming Event Handling	2 mins NodeJS	Solve
Review the following NodeJS code: 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 Sorting By Custom Order	30 mins Coding	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 String Parsing Character Counting	30 mins Coding	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	💪 Difficulty	⌛ Time
	I/O cycle and main module Event Loop Async/await Concurrency Exception Handling	NodeJS	Medium	2 mins	Solve
Review the following NodeJS code: 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
	Res methods Error Handling Troubleshooting	NodeJS	Easy	3 mins	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
	Phases and Timers Event Loop Asynchronous Programming Event Handling	NodeJS	Medium	2 mins	Solve
Review the following NodeJS code: 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.
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	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
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	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.

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Why you should use Pre-employment Node.js Online Test?

The Node.js Online 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 and utilizing the Node.js Module System
Proficiency in working with the File System and Command Line Args in Node.js
Effectively debugging Node.js applications
Working with asynchronous code in Node.js and utilizing promises
Developing and securing REST APIs and web servers with Node.js

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 Node.js Online Test?

Node.js Module System: The Node.js module system is a way of organizing and reusing code in Node.js applications. It allows developers to define their own modules, as well as use built-in modules, to organize their code into separate files and directories. This skill is measured in the test to assess the candidate's understanding of how to properly structure and manage code using the module system.

File System and Command Line Args: The file system and command line args are important aspects of Node.js development. Understanding how to interact with the file system enables developers to read, write, and manipulate files, which is crucial for many applications. Similarly, command line args allow developers to pass arguments to their Node.js applications, making them more flexible and customizable. This skill is measured in the test to evaluate the candidate's proficiency in working with the file system and command line args.

Debugging Node.js: Debugging is a crucial skill for any developer, and Node.js is no exception. Being able to identify and fix bugs, trace program execution, and use debugging tools effectively is essential for developing reliable and efficient Node.js applications. This skill is measured in the test to assess the candidate's ability to debug and troubleshoot Node.js code.

Asynchronous Node.js and promises: Asynchronous programming is a fundamental aspect of Node.js, allowing developers to efficiently handle concurrent operations and avoid blocking the event loop. Promises are a popular approach for managing asynchronous code in JavaScript, providing a way to handle success and failure cases. This skill is measured in the test to evaluate the candidate's proficiency in writing asynchronous Node.js code and working with promises.

REST APIs and web servers: REST APIs and web servers are at the core of many modern web applications. Understanding how to design and implement RESTful APIs using Node.js allows developers to create scalable and efficient server-side applications. This skill is measured in the test to assess the candidate's knowledge of building REST APIs and web servers using Node.js.

API Authentication and Security: API authentication and security are critical aspects of developing secure and reliable web applications. Having knowledge of various authentication mechanisms, such as token-based authentication and OAuth, and understanding common security vulnerabilities and countermeasures is essential for building secure Node.js applications. This skill is measured in the test to evaluate the candidate's understanding of API authentication and security best practices in the context of Node.js.

Testing and releasing Node.js: Testing and releasing Node.js applications is vital to ensure their quality and reliability. Knowledge of various testing techniques, such as unit testing, integration testing, and end-to-end testing, as well as familiarity with tools and practices for continuous integration and deployment, is crucial for delivering high-quality Node.js applications. This skill is measured in the test to assess the candidate's proficiency in testing and releasing Node.js applications.

NPM package system: The NPM package system is a central component of the Node.js ecosystem, allowing developers to easily manage and share reusable code packages. Understanding how to create, publish, and consume NPM packages, as well as managing dependencies effectively, is essential for efficient Node.js development. This skill is measured in the test to evaluate the candidate's knowledge of the NPM package system and their ability to work with external packages in Node.js applications.

Node Middlewares: Node middlewares are functions that can handle incoming HTTP requests in an Express.js application. They allow for the modification of request and response objects, enabling features such as authentication, error handling, and request parsing. Understanding how to write and use middlewares is essential for building robust and scalable Node.js web applications. This skill is measured in the test to assess the candidate's proficiency in working with middlewares in Node.js applications.

Event Loop and Timers: The event loop and timers are key components in the Node.js runtime environment. Understanding how the event loop works and how to utilize timers, such as setTimeout and setInterval, allows developers to efficiently manage asynchronous code execution and schedule tasks. This skill is measured in the test to evaluate the candidate's understanding of the event loop and timers in Node.js.

In-depth express js framework: Express.js is a popular web application framework for Node.js, providing a robust set of features and tools for building web applications. Having in-depth knowledge of Express.js, including routing, middleware usage, error handling, and template engines, is crucial for developing scalable and maintainable Node.js web applications. This skill is measured in the test to assess the candidate's proficiency in working with the Express.js framework.

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 Node.js Online Test to be based on.

Module System

Module Exports

Module Imports

File System

Read Files

Write Files

Command Line Args

Debugging

Debugging Tools

Asynchronous Operations

Promises

Async/Await

REST APIs

HTTP Methods

Routing

API Authentication

Token-based Authentication

Security

Testing Node.js

Unit Testing

Integration Testing

Releasing Node.js Application

Semantic Versioning

NPM Package System

Package.json

Dependencies

DevDependencies

Node Middlewares

Express.js

Body Parser

Helmet

Event Loop

Timers

setTimeout

setInterval

Express.js Routing

Middlewares

Template Engines

Error Handling

Route Params

Query Params

Request Body

Response Status Codes

CORS

Error Handling Middleware

Error Logging

Custom Error Handling

Authentication Middleware

JWT

Sessions

Express.js Middleware

Express.js Static Files

Express.js Templating

Route Middleware

Express.js Error Handling

Express.js Route Params

Express.js Query Params

Express.js Request Body

What roles can I use the Node.js Online Test for?

Node JS Developer
Senior Node JS Developer
Backend Node Developer
Senior Backend Node.JS Developer
Express.js Developer

How is the Node.js 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

Implementing API authentication and security measures in Node.js
Testing and releasing Node.js applications
Knowledge of the NPM package system and dependency management in Node.js
Implementing Node Middlewares in applications
In-depth understanding of the Event Loop and Timers in Node.js
Expertise in the express.js framework for building web applications

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

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Multiple Question Sets

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Have questions about the Node.js Hiring Test?

What is Node.js Online Test?

The Node.js Online Test - node-js-test is designed to assess candidates on various aspects of Node.js, including the module system, file system, debugging, asynchronous programming, and more. It is widely used by recruiters to evaluate the skillset of potential hires in Node.js. This test is particularly beneficial for roles that require advanced knowledge in Node.js and related technologies.

Can I combine Node.js Online Test with JavaScript questions?

Yes, recruiters can request a custom test that includes both Node.js and JavaScript questions. For details on how we assess JavaScript skills, please visit JavaScript Online Test.

What topics are evaluated in the Node.js Online Test?

The test covers various topics including the Node.js Module System, File System and Command Line Args, Debugging Node.js, Asynchronous Node.js and promises, REST APIs and web servers, API Authentication and Security, Testing and releasing Node.js, NPM package system, Node Middlewares, Event Loop and Timers, and the express.js framework.

How to use Node.js Online Test in my hiring process?

Add the assessment link to your job post or invite candidates via email. Use the test as a pre-screening tool to evaluate skills early in the recruitment process.

Can I test JavaScript and Node.js together in a test?

Yes, you can test both JavaScript and Node.js together. This combination is recommended for roles requiring proficiency in both technologies. For more details, visit the JavaScript & NodeJS Test.

What are the main JavaScript tests?

Some important JavaScript-related tests are:

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.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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