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TCS Node JS Developer Interview Questions and Answers

Updated 16 Nov 2024

8 Interview questions

🔥 Asked by recruiter 3 times
A Node JS Developer was asked 7mo ago
Q. What is the event loop in Node.js?
Ans. 

Event loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.

  • Event loop is responsible for handling asynchronous operations in Node.js.

  • It allows Node.js to perform multiple operations concurrently without blocking the execution.

  • Event loop continuously checks the event queue for any pending events and executes them in a loop.

  • Example: When reading a file in Node.js, the event loop ...

A Node JS Developer was asked 7mo ago
Q. How do you deploy a Node.js application?
Ans. 

Node.js applications can be deployed using various methods such as using a hosting service, containerization, or serverless platforms.

  • Use a hosting service like Heroku, AWS, or DigitalOcean to deploy the application.

  • Containerize the application using Docker and deploy it on a container orchestration platform like Kubernetes.

  • Utilize serverless platforms like AWS Lambda or Google Cloud Functions for deploying server...

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Q4. How do you deploy your Node.js application?
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🔥 Asked by recruiter 2 times
A Node JS Developer was asked 7mo ago
Q. How does Node.js work?
Ans. 

Node.js is a runtime environment that allows JavaScript code to run on the server-side.

  • Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

  • It uses the V8 JavaScript engine from Google Chrome to execute code.

  • Node.js allows developers to build scalable network applications using JavaScript.

  • It has a large ecosystem of libraries and frameworks, such as Express.js for web applicati...

A Node JS Developer was asked 8mo ago
Q. What is a callback function?
Ans. 

A callback function is a function passed as an argument to another function, which will be executed at a later time.

  • Used in asynchronous programming to handle tasks that take time to complete

  • Allows functions to be executed after another function has finished

  • Commonly used in Node.js for handling I/O operations

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A Node JS Developer was asked 12mo ago
Q. How does multi-processing work in Node.js?
Ans. 

Node.js uses child processes for multi-processing to take advantage of multiple CPU cores.

  • Node.js uses child processes to run multiple instances of the application in parallel.

  • The 'cluster' module can be used to create a pool of worker processes to handle incoming requests.

  • Using child processes allows Node.js to take advantage of multiple CPU cores for better performance.

A Node JS Developer was asked
Q. What is 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

A Node JS Developer was asked
Q. How do you connect a database to Node.js?
Ans. 

Use a database driver like Mongoose or Sequelize to connect a database to Node.js

  • Install the database driver package using npm

  • Require the database driver in your Node.js application

  • Create a connection to the database using the driver's connection method

  • Use the connection object to interact with the database

Are these interview questions helpful?
A Node JS Developer was asked 7mo ago
Q. List AWS services used
Ans. 

Some AWS services commonly used by Node JS developers are EC2, S3, Lambda, RDS, and API Gateway.

  • EC2 (Elastic Compute Cloud) for scalable virtual servers

  • S3 (Simple Storage Service) for object storage

  • Lambda for serverless computing

  • RDS (Relational Database Service) for managed databases

  • API Gateway for creating, publishing, maintaining, monitoring, and securing APIs

TCS Node JS Developer Interview Experiences

6 interviews found

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I appeared for an interview in May 2024.

Round 1 - Technical 

(2 Questions)

  • Q1. How node.js works
  • Ans. 

    Node.js is a runtime environment that allows JavaScript code to run on the server-side.

    • Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

    • It uses the V8 JavaScript engine from Google Chrome to execute code.

    • Node.js allows developers to build scalable network applications using JavaScript.

    • It has a large ecosystem of libraries and frameworks, such as Express.js for web applications.

  • Answered by AI
  • Q2. What is event loop in Node.js
  • Ans. 

    Event loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.

    • Event loop is responsible for handling asynchronous operations in Node.js.

    • It allows Node.js to perform multiple operations concurrently without blocking the execution.

    • Event loop continuously checks the event queue for any pending events and executes them in a loop.

    • Example: When reading a file in Node.js, the event loop allow...

  • Answered by AI
Round 2 - Technical 

(2 Questions)

  • Q1. How to deploy node.js application
  • Ans. 

    Node.js applications can be deployed using various methods such as using a hosting service, containerization, or serverless platforms.

    • Use a hosting service like Heroku, AWS, or DigitalOcean to deploy the application.

    • Containerize the application using Docker and deploy it on a container orchestration platform like Kubernetes.

    • Utilize serverless platforms like AWS Lambda or Google Cloud Functions for deploying serverless ...

  • Answered by AI
  • Q2. List AWS services used
  • Ans. 

    Some AWS services commonly used by Node JS developers are EC2, S3, Lambda, RDS, and API Gateway.

    • EC2 (Elastic Compute Cloud) for scalable virtual servers

    • S3 (Simple Storage Service) for object storage

    • Lambda for serverless computing

    • RDS (Relational Database Service) for managed databases

    • API Gateway for creating, publishing, maintaining, monitoring, and securing APIs

  • Answered by AI

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Assessment test 

(2 Questions)

  • Q1. What is a callback function?
  • Ans. 

    A callback function is a function passed as an argument to another function, which will be executed at a later time.

    • Used in asynchronous programming to handle tasks that take time to complete

    • Allows functions to be executed after another function has finished

    • Commonly used in Node.js for handling I/O operations

  • Answered by AI
  • Q2. Output of setTimeout Js Function?
  • Ans. 

    setTimeout function in JavaScript executes a function after a specified delay.

    • setTimeout function takes two parameters: a function to be executed and a delay in milliseconds.

    • The function is executed only once after the specified delay.

    • Example: setTimeout(() => { console.log('Hello, World!'); }, 2000); // Output: 'Hello, World!' after 2 seconds

  • Answered by AI

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Aptitude Test 

Node.js. mongodb

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Multi processing in node
  • Ans. 

    Node.js uses child processes for multi-processing to take advantage of multiple CPU cores.

    • Node.js uses child processes to run multiple instances of the application in parallel.

    • The 'cluster' module can be used to create a pool of worker processes to handle incoming requests.

    • Using child processes allows Node.js to take advantage of multiple CPU cores for better performance.

  • Answered by AI

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. How to connect db to node
  • Ans. 

    Use a database driver like Mongoose or Sequelize to connect a database to Node.js

    • Install the database driver package using npm

    • Require the database driver in your Node.js application

    • Create a connection to the database using the driver's connection method

    • Use the connection object to interact with the database

  • Answered by AI
  • Q2. What is 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

  • Answered by AI

Skills evaluated in this interview

Node JS Developer Interview Questions & Answers

user image praveenkumar s

posted on 14 Mar 2024

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - One-on-one 

(1 Question)

  • Q1. It was good and questions asked from my resume

Interview questions from similar companies

I applied via Walk-in and was interviewed before Dec 2020. There were 3 interview rounds.

Interview Questionnaire 

3 Questions

  • Q1. Basic Programming questions.
  • Q2. Fibonacci program
  • Ans. 

    A Fibonacci program generates a sequence where each number is the sum of the two preceding ones, starting from 0 and 1.

    • The Fibonacci sequence starts with 0 and 1.

    • Each subsequent number is the sum of the previous two: 0, 1, 1, 2, 3, 5, 8, 13, ...

    • Common implementations include recursive, iterative, and using dynamic programming.

    • Example of an iterative approach in Python: ```python def fibonacci(n): a, b = 0, 1 ...

  • Answered by AI
  • Q3. OOPS concepts.

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare basic OOPS concepts and basic programs.
Are these interview questions helpful?

I applied via LinkedIn and was interviewed before Jul 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

Easy logical questions
basic quant

Round 2 - Coding Test 

Easy level coding questions
Counting frequency of alphabets

Interview Preparation Tips

Interview preparation tips for other job seekers - Just go through the basics of javascript
Hoisting

Interview Questionnaire 

1 Question

  • Q1. How to use multiple dispatch in redux?
  • Ans. 

    Multiple dispatch is not a feature of Redux. It can be achieved using middleware or custom logic.

    • Middleware like redux-thunk or redux-saga can be used to dispatch multiple actions based on a single action.

    • Custom logic can be implemented in the reducer to handle multiple actions based on a single action type.

    • For example, a single 'ADD_ITEM' action can trigger multiple actions like 'UPDATE_TOTAL', 'UPDATE_HISTORY', etc.

    • M...

  • Answered by AI

Skills evaluated in this interview

I applied via Walk-in and was interviewed before Sep 2019. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. 1.Technical Ques(OOPS Concept)and 2. Area of Interest 3. About Company 4. more

Interview Preparation Tips

Interview preparation tips for other job seekers - Hello Folks,
Sharing some tips while facing Interview Assessment or GD Round Assessment.
1. Be Confident always give the answer what they ask for, Never connect your answer with different topic.
2. Always go through Company Portal or wiki about their Operation & Function.
3. Always have positive vibes that whatever yes or No, You will surely gain something.
All the Best..!!

TCS Interview FAQs

How many rounds are there in TCS Node JS Developer interview?
TCS interview process usually has 1-2 rounds. The most common rounds in the TCS interview process are Technical, One-on-one Round and Aptitude Test.
How to prepare for TCS Node JS Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at TCS. The most common topics and skills that interviewers at TCS expect are Node.Js, Javascript, AWS, Microservices and MongoDB.
What are the top questions asked in TCS Node JS Developer interview?

Some of the top questions asked at the TCS Node JS Developer interview -

  1. How to deploy node.js applicat...read more
  2. What is event loop in Node...read more
  3. How to connect db to n...read more

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Overall Interview Experience Rating

3.8/5

based on 6 interview experiences

Difficulty level

Moderate 100%

Duration

Less than 2 weeks 100%
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TCS Node JS Developer Salary
based on 73 salaries
₹3.5 L/yr - ₹9.4 L/yr
8% less than the average Node JS Developer Salary in India
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TCS Node JS Developer Reviews and Ratings

based on 11 reviews

4.0/5

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4.0

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4.2

Work-life balance

2.6

Salary

4.6

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4.0

Company culture

3.0

Promotions

4.0

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