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Virtual Height IT Services Node JS Developer Interview Questions and Answers
7 Interview questions
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
Variable and function declarations are hoisted to the top of their scope.
Only declarations are hoisted, not initializations.
Function declarations take precedence over variable declarations.
JavaScript is a high-level, interpreted programming language used for creating interactive websites and web applications.
JavaScript is often used for client-side scripting to make web pages interactive.
It can also be used for server-side development with Node.js.
JavaScript is versatile and can be used for creating games, mobile apps, and more.
Callback hell is a situation in asynchronous JavaScript programming where multiple nested callbacks make the code difficult to read and maintain.
Occurs when multiple asynchronous operations are nested within each other
Leads to deeply nested code structure which is hard to read and debug
Can be avoided by using promises, async/await, or modularizing code
Asynchronous nature in Node JS refers to the ability of the program to execute multiple tasks simultaneously without blocking the main thread.
Allows non-blocking I/O operations, improving performance and scalability
Uses event-driven architecture to handle multiple requests concurrently
Uses callbacks, promises, and async/await for handling asynchronous operations
Async await in Node.js is a feature that allows you to write asynchronous code in a synchronous manner.
Async await is built on top of Promises in Node.js.
It allows you to write asynchronous code that looks like synchronous code, making it easier to read and maintain.
The 'async' keyword is used to define a function as asynchronous, while the 'await' keyword is used to wait for a Promise to resolve before continuing...
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used in event handlers, callbacks, and in functional programming.
Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar...
Spread operator allows an iterable to be expanded in places where zero or more arguments or elements are expected. Rest operator collects all the remaining elements into an array.
Spread operator is denoted by three dots (...) and is used to expand elements of an iterable like an array or object.
Rest operator is also denoted by three dots (...) and is used to collect multiple elements into a single array.
Spread ope...
Virtual Height IT Services Node JS Developer Interview Experiences
1 interview found
Anonymous
Selected
I applied via Approached by Company and was interviewed before Apr 2023. There was 1 interview round.
(8 Questions)
- Q1. What is hoisting
- Ans.
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
Variable and function declarations are hoisted to the top of their scope.
Only declarations are hoisted, not initializations.
Function declarations take precedence over variable declarations.
- Q2. What is clousers
- Ans.
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used in event handlers, callbacks, and in functional programming.
Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar); };...
- Q3. What is javascript
- Ans.
JavaScript is a high-level, interpreted programming language used for creating interactive websites and web applications.
JavaScript is often used for client-side scripting to make web pages interactive.
It can also be used for server-side development with Node.js.
JavaScript is versatile and can be used for creating games, mobile apps, and more.
- Q4. What is spread operator and rest operator in js
- Ans.
Spread operator allows an iterable to be expanded in places where zero or more arguments or elements are expected. Rest operator collects all the remaining elements into an array.
Spread operator is denoted by three dots (...) and is used to expand elements of an iterable like an array or object.
Rest operator is also denoted by three dots (...) and is used to collect multiple elements into a single array.
Spread operator...
- Q5. What is call back
- Q6. What us callback hell
- Ans.
Callback hell is a situation in asynchronous JavaScript programming where multiple nested callbacks make the code difficult to read and maintain.
Occurs when multiple asynchronous operations are nested within each other
Leads to deeply nested code structure which is hard to read and debug
Can be avoided by using promises, async/await, or modularizing code
- Q7. What do you mean by asyc nature
- Ans.
Asynchronous nature in Node JS refers to the ability of the program to execute multiple tasks simultaneously without blocking the main thread.
Allows non-blocking I/O operations, improving performance and scalability
Uses event-driven architecture to handle multiple requests concurrently
Uses callbacks, promises, and async/await for handling asynchronous operations
- Q8. What is asyc await in node
- Ans.
Async await in Node.js is a feature that allows you to write asynchronous code in a synchronous manner.
Async await is built on top of Promises in Node.js.
It allows you to write asynchronous code that looks like synchronous code, making it easier to read and maintain.
The 'async' keyword is used to define a function as asynchronous, while the 'await' keyword is used to wait for a Promise to resolve before continuing.
Usin...
Interview Preparation Tips
- Javascript
- Node.Js
Skills evaluated in this interview
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I appeared for an interview before Aug 2016.
Interview Preparation Tips
Experience: I am vinothkumar from Dindugal, I was studied computer engineering in Madurai institute of engineering and technology at sivagangai, I am quality controller in RR DONNELLY at Chennai, my experience 2 years, my family staying in native, my father palanichami he is a former, my mother tamilselvi she is home maker and my one yelder brother Vijayakumar he is driver, I am interested area software engineer, my hobbies are listening music, reading book and news paper, playing and watching cricket
Tips: No comments
Round: Test
Experience: I am vinothkumar from Dindugal, I was studied computer engineering in Madurai institute of engineering and technology at sivagangai, I am quality controller in RR DONNELLY at Chennai, my experience 2 years, my family staying in native, my father palanichami he is a former, my mother tamilselvi she is home maker and my one yelder brother Vijayakumar he is driver, I am interested area software engineer, my hobbies are listening music, reading book and news paper, playing and watching cricket
Tips: No comments
Total Questions: 15
Round: Test
Experience: See my mentality
Tips: No comments
Duration: 45 minutes
Round: Group Discussion
Experience: Communication
Tips: No comments
Skills: Communication And Confidence
Amit kumar Mohanty
I applied via Referral and was interviewed in Jul 2023. There were 4 interview rounds.
String , Array ,Collection framework related questions.
Ecommerce site with Login,Review,AddToCart,Order features,Filter features.
(1 Question)
- Q1. Html,Css,Js. Interviewer don't have knowledge on Java,React js.And if you don't able to answer basic html,css related questions they will disqualify you.
Interview Preparation Tips
Selected
I applied via LinkedIn and was interviewed in Apr 2023. There were 3 interview rounds.
Todo application javascript todo app creation needs to submit
(1 Question)
- Q1. Expected salary, family, future plans
Interview Preparation Tips
Raman kheti
Selected
I appeared for an interview in Jun 2023.
(1 Question)
- Q1. Docker Basics:What is Docker, and how does it differ from traditional virtualization?Explain the purpose of Docker images and containers.Node.js Fundamentals:Describe the event-driven architecture of Node....
- Q1. The Golden Rules of Accounting are the basic principles for recording financial transactions in the books of accounts. They are categorized based on the type of account involved: 1. Personal Account Rule: ...
- Q2. 1. Mutual Funds A mutual fund is a type of investment vehicle that pools money from multiple investors to invest in various financial securities like stocks, bonds, or other assets. It is managed by profes...
Moningi Ashwini
Selected
I applied via Company Website and was interviewed in Jul 2023. There were 4 interview rounds.
I have given the coding test in python language. Out of 5 questions, we have to attain a minimum of 3 questions.
(1 Question)
- Q1. The questions in technical round is related to the task which were given to us and also they ask basics questions related to technical.
(1 Question)
- Q1. The interview was about the personality check, overeally it was good .
Interview Preparation Tips
Jayshree
Selected
I appeared for an interview in Apr 2025, where I was asked the following questions.
- Q1. Basic concepts of Promises
- Q2. What is Hashing
- Q3. Authentication and Validation
I applied via Naukri.com and was interviewed in Jan 2022. There were 3 interview rounds.
(1 Question)
- Q1. What are development life cycles
- Ans.
Development life cycles are processes used to plan, design, build, test, and deploy software applications.
There are several development life cycles, including Waterfall, Agile, and DevOps.
The Waterfall model is a linear approach where each phase must be completed before moving on to the next.
Agile methodologies focus on iterative development and continuous feedback.
DevOps combines development and operations to create a...
(1 Question)
- Q1. How did you do deployment
(1 Question)
- Q1. What's your ctc and ectc
- Ans.
I prefer not to disclose my current or expected salary as it is not relevant to my qualifications and experience.
I believe that my skills and experience are more important than my current or expected salary
I am open to discussing compensation that is fair and competitive for the role and my qualifications
I am more interested in the opportunity to work on challenging projects and grow my skills
I would like to focus on h...
Interview Preparation Tips
Skills evaluated in this interview
Online test which consists of java, angular, micro services related questions
(1 Question)
- Q1. Difference between static and default methods
- Ans.
Static methods belong to the class itself, while default methods are part of an interface in Java.
Static methods can be called without creating an instance of the class, while default methods are used to provide a default implementation in interfaces.
Static methods are defined using the 'static' keyword, while default methods are defined using the 'default' keyword in Java.
Static methods cannot be overridden in subclas...
Skills evaluated in this interview
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