250+ Node Js MCQ With Online Practice Test

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Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.

221. What is the primary benefit of building serverless applications with AWS Lambda and Node.js?

Answer: Simplified infrastructure management

222. In a serverless architecture, what is AWS Lambda's role in executing Node.js code?

Answer: Running code in response to events without the need for server provisioning

223. What is the primary trigger for AWS Lambda functions in serverless applications?

Answer: HTTP requests

224. What is an "event source" in AWS Lambda for Node.js applications?

Answer: A service or resource that triggers the execution of a Lambda function

225. In AWS Lambda, how can environment variables be set for Node.js functions?

Answer: Through the AWS Management Console, AWS CLI, or AWS SDKs

226. What is the maximum execution duration for an AWS Lambda function by default?

Answer: 60 seconds

227. How can AWS Lambda functions be invoked asynchronously in response to events in serverless applications?

Answer: By using the AWS SDKs or event sources such as S3, SNS, or API Gateway

228. What is "cold start" in the context of AWS Lambda and how can it affect serverless Node.js applications?

Answer: The initial startup time for a Lambda function, which can cause latency for the first invocation

229. What AWS service can be used to orchestrate the execution of multiple AWS Lambda functions in a serverless workflow?

Answer: AWS Step Functions

230. What does "npm" stand for in the context of Node.js development?

Answer: Node Package Manager
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