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ExpressJS Test

The ExpressJS Test evaluates a candidate's knowledge and skills in using ExpressJS, Node.js, and Javascript for web development. It covers topics such as routing, middleware, handling requests and responses, working with databases, and building APIs.

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Screen candidates with a 40 mins test

Test duration:  ~ 40 mins
Difficulty level:  Moderate
Availability:  Available as custom test
Questions:
  • 5 ExpressJS MCQs
  • 5 NodeJS MCQs
  • 5 JavaScript MCQs
Covered skills:
Routing in Express
Setting up Express application
Serving Static Files in Express
Routing in Express
Creating and Using Middlewares in Express
Using Template Engines
Debugging Express
Node.js Fundamentals
Javascript Coding
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Use the ExpressJS Assessment Test to shortlist qualified candidates

The ExpressJS 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:

  • Ability to set up and configure an Express.js application
  • Knowledge of routing in Express.js for handling different endpoints
  • Understanding of serving static files in Express.js
  • Experience in creating and using middlewares in Express.js
  • Ability to use template engines for dynamic content in Express.js
  • Proficiency in debugging Express.js applications
  • Understanding of Node.js fundamentals
  • Strong knowledge of JavaScript coding
  • Experience in handling exceptions and errors
  • Capability of optimizing performance in Express.js applications
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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 ExpressJS Test will be non-googleable.

🧐 Question

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.

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
🧐 Question🔧 Skill

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

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
🧐 Question🔧 Skill💪 Difficulty⌛ Time
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
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

Test candidates on core ExpressJS Hiring Test topics

Routing in Express: Routing in Express refers to how the application handles different HTTP requests and directs them to the appropriate route. It essentially maps the requested URL to the corresponding handler function or middleware, making it a crucial skill for building dynamic web applications.

Setting up Express application: Setting up an Express application involves installing the necessary dependencies, configuring the application settings, and creating the basic file structure. This skill is important because it lays the foundation for developing and running an Express application.

Serving Static Files in Express: Serving static files in Express allows the application to serve HTML, CSS, JavaScript, and other static files to the client. It ensures that the web pages are properly rendered and the necessary assets are loaded, making it an essential skill for web development.

Creating and Using Middlewares in Express: Middlewares in Express are functions that have access to the request and response objects. They can be used to add functionality, perform validation, handle errors, and more. Being able to create and use middlewares is important for building robust and scalable applications.

Using Template Engines: Template engines in Express allow for the dynamic generation of HTML pages by combining templates with data. They simplify the process of rendering HTML on the server and enable code reuse. Understanding and using template engines is crucial for developing dynamic web applications.

Debugging Express: Debugging Express involves identifying and fixing issues or errors in the application code. It requires understanding the error messages, using debugging tools, and troubleshooting the code to ensure smooth operation. Being proficient in debugging Express applications is necessary to deliver high-quality software.

Node.js Fundamentals: Node.js fundamentals encompass the core concepts and features of Node.js, including event-driven architecture, non-blocking I/O, modules, and file system operations. Knowledge of Node.js fundamentals is important as Express.js is built on top of Node.js and understanding how it works under the hood helps in building efficient applications.

Javascript Coding: Javascript coding refers to the ability to write clean, efficient, and maintainable code using the Javascript programming language. Strong Javascript coding skills are essential for developing server-side applications using Express.js and effectively utilizing the various features and functionalities it offers.

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Have questions about the ExpressJS 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 ExpressJS Assessment Test for?

Here are few roles for which we recommend this test:

  • Full Stack Developer
  • Backend Developer
  • Node.js 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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