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JavaScript, NodeJS & SQL Online Test

The JavaScript, NodeJS & SQL Test uses scenario-based MCQs to evaluate candidates on their proficiency in JavaScript programming language, NodeJS runtime environment, and SQL database. The test assesses candidates' understanding of topics such as event-driven programming, asynchronous programming, middleware, database connections, SQL queries, and database design principles. Candidates are evaluated on their ability to use JavaScript and NodeJS to develop server-side applications, interact with databases, design database schemas, and write optimized and secure SQL queries for data manipulation and retrieval.

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Screen candidates with a 50 mins test

Test duration:  50 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 5 JavaScript MCQs
  • 5 NodeJS MCQs
  • 5 SQL 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
SQL CRUD operations
SQL Joins and Indexes
JavaScript Programming
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Use the JavaScript, NodeJS & SQL Test to shortlist qualified candidates

The JavaScript, NodeJS & SQL 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:

  • Proficient in JavaScript Basics
  • Strong understanding of JS ES6 concepts
  • Ability to apply JavaScript OOPs principles
  • Experience in handling APIs in JavaScript
  • Familiarity with asynchronous programming in Node.js and promises
  • Deep knowledge of the Node.js Module System
  • Understanding of the Request Response Lifecycle in Node.js
  • Competence in SQL CRUD operations
  • Skill in SQL Joins and Indexes
  • Strong JavaScript programming skills
  • Effective error and exception handling
  • Experience with Git version control
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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 & SQL 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.

Medium

Multi Select
JOIN
GROUP BY
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image

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
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

Medium

Multi Select
JOIN
GROUP BY

2 mins

SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions

3 mins

SQL
Solve

Medium

Select & IN
Nested queries

3 mins

SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators

3 mins

SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions

2 mins

SQL
Solve

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
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
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve

Test candidates on core JavaScript, NodeJS & SQL Hiring Test topics

JavaScript Basics: JavaScript Basics covers the fundamental concepts and syntax of the JavaScript programming language, including variables, data types, operators, control structures, and functions. This skill is measured in the test to assess the candidate's understanding of the core principles of JavaScript and their ability to write basic JavaScript code.

JS ES6: JS ES6 focuses on the new features and enhancements introduced in ECMAScript 6, the latest version of JavaScript. It includes concepts such as arrow functions, template literals, destructuring, classes, modules, and promises. This skill is measured in the test to evaluate the candidate's familiarity with modern JavaScript language features and their ability to write efficient and maintainable code.

JS OOPs: JS OOPs (Object-Oriented Programming) involves organizing code into reusable objects and using inheritance, encapsulation, and polymorphism. It allows for better code organization, modularity, and reusability. This skill is measured in the test to assess the candidate's proficiency in writing object-oriented JavaScript code and their understanding of OOP principles.

Handling APIs: Handling APIs involves retrieving data from external web APIs and integrating it into JavaScript applications. It requires knowledge of HTTP requests, JSON parsing, and handling asynchronous operations. This skill is measured in the test to evaluate the candidate's ability to work with web APIs and consume external data in JavaScript applications.

Asynchronous Node.js and promises: Asynchronous Node.js and promises focus on the asynchronous nature of Node.js and the use of promises for handling asynchronous operations. It includes concepts such as callbacks, event-driven programming, async/await, and error handling. This skill is measured in the test to assess the candidate's understanding of asynchronous programming in Node.js and their ability to write efficient and scalable asynchronous code.

Node.js Module System: Node.js Module System covers the organization and reusable modules in Node.js applications. It includes concepts such as importing and exporting modules, using core modules, custom module creation, and module resolution. This skill is measured in the test to evaluate the candidate's familiarity with the module system in Node.js and their ability to create and use modules effectively in Node.js projects.

Request Response Lifecycle: Request Response Lifecycle involves understanding how client-server communication works in the context of web applications. It includes concepts such as HTTP methods, request headers, route handling, middleware, and response handling. This skill is measured in the test to assess the candidate's understanding of the request-response flow in web applications and their ability to handle HTTP requests and responses effectively.

SQL CRUD operations: SQL CRUD operations refer to the create, read, update, and delete operations performed on the database using Structured Query Language (SQL). It includes concepts such as inserting data, querying data, updating data, and deleting data from relational databases. This skill is measured in the test to evaluate the candidate's proficiency in SQL and their ability to perform basic database operations using SQL.

SQL Joins and Indexes: SQL Joins and Indexes involve working with relational databases and understanding how to join tables and optimize database performance using indexes. It includes concepts such as inner join, outer join, cross join, primary keys, foreign keys, and index creation. This skill is measured in the test to assess the candidate's ability to write complex queries involving joins and their knowledge of optimizing database queries using indexes.

JavaScript Programming: JavaScript Programming covers the overall ability of candidates to write clean, efficient, and well-structured JavaScript code. It assesses their knowledge of best practices, coding conventions, error handling, code performance, and troubleshooting skills. This skill is measured in the test to evaluate the candidate's overall proficiency in JavaScript programming and their ability to solve programming problems using JavaScript.

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Have questions about the JavaScript, NodeJS & SQL Hiring Test?

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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 & SQL Test for?

Here are few roles for which we recommend this test:

  • Full Stack Developer
  • JavaScript Developer
  • Node.js Developer
  • SQL 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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