Capgemini Node JS Developer Interview Questions and Answers

BE AWARE THAT Interview starts at 10 ends at 6 in the evening

this will be 1st round

let arr=[{id:1,x:10},{id:2,y:10}}],let arr2=[{id:1:x10},{id:3,y:20}]
you need to combine both the object merge it into one

2. you will be given sql query to write that is get method

Q1. What is eventlopp
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Q2. How node.js working
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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.
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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...read more
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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
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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
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Q1. What is the reason data didnt reached backend
Ans. 
Possible reasons for data not reaching backend include network issues, incorrect API endpoints, server errors, and client-side validation errors.
• Network connectivity issues

• Incorrect API endpoints

• Server errors

• Client-side validation errors
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Q2. How to scale app for more users
Ans. 
To scale an app for more users, consider optimizing code, using caching, load balancing, and horizontal scaling.
• Optimize code for better performance

• Implement caching to reduce database load

• Use load balancing to distribute traffic evenly

• Consider horizontal scaling by adding more servers

• Use microservices architecture for better scalability
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Q1. Wht do you know about your company
Ans. *Do a proper research about the company *Read online about the company's latest Abdates *understand it's business *role thoroughly the job description
Answered by Sobha Reddy
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Q2. Why should we hear you?
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Q3. With this tricky interview questions amd answer the employer wants to see your ability to pitch your skills and conversing power.
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Q1. What are your strengths and weaknesses?
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Q2. Tell me about self details
Ans. First i would like to for giving me this wonderful opportunity my self sobha i am from kadapa i have completed graduate in BSC biotechnology in vaishnavi degree college in rajampet. Percentage is 80%. I have 5 members are my family. I do have certificate in various department of clinical research amd clinical trials. My strength or quick Lerner dedicated towards assessment i have good exposure in clinical data mana
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Q3. What is Pharmacovilance
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Q4. Pharmacoviglance is a science is related to detection assessment understanding prevention of adverse events.
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Q5. What clinical research?
Ans. 
I'm sorry, but the question is not related to the job position of Node JS Developer.
• The question is not relevant to the job position.

• It is important to stay focused on the job requirements.

• If you are unsure about a question, it is okay to ask for clarification.
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Q6. Clinical research is a branch of health care science that determines the safety and effectiveness of medications devises diagnostic products treatment regiment intended from human use.
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Q1. What is event loop
Ans. 
Event loop is a mechanism in Node.js that allows non-blocking I/O operations to be performed asynchronously.
• Event loop is responsible for handling asynchronous operations in Node.js

• It allows Node.js to perform I/O operations without blocking the execution of other code

• Event loop continuously checks the event queue for new events to process

• Callbacks are used to handle the completion of asynchronous operations
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Q2. What is api gateway in aws
Ans. 
API Gateway in AWS is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale.
• API Gateway allows you to create RESTful APIs that can be integrated with other AWS services like Lambda, DynamoDB, and S3.

• It provides features like authentication, authorization, rate limiting, and caching to improve API performance and security.

• API Gateway can also be use...read more
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Q3. What's swagger and how to add authentication in swagger
Ans. 
Swagger is a tool for designing, building, and documenting APIs. Adding authentication in Swagger involves using security definitions and security requirements.
• Swagger is a tool used for designing, building, and documenting APIs

• To add authentication in Swagger, you can use security definitions to define authentication methods like API keys, OAuth, etc.

• You can then specify security requirements in your Swagger documenta...read more
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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
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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
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First round was like MCQ Technical Assessment. Difficulty level was medium.