250+ Node Js MCQ With Online Practice Test

Practice Test  Beta

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.

171. What is the purpose of the console.log() statement in debugging Node.js code?

Answer: To display output messages in the console for inspection

172. In Visual Studio Code, what extension is commonly used for debugging Node.js applications?

Answer: Node Debug

173. What is "watch mode" in debugging tools like nodemon or ts-node-dev for Node.js?

Answer: A mode for monitoring code changes and automatically restarting the application during development

174. What is the purpose of profiling in Node.js debugging tools?

Answer: To analyze the performance of code and identify bottlenecks

175. Which tool is commonly used for memory profiling in Node.js applications?

Answer: Chrome Developer Tools

176. What is one of the key benefits of using asynchronous, non-blocking I/O in Node.js for performance optimization?

Answer: Lower memory usage

177. In Node.js, what is the purpose of the Event Loop in terms of performance optimization?

Answer: To efficiently manage I/O operations and callbacks

178. What is the term for an external module in Node.js that can be used to cluster multiple Node.js processes for better performance and concurrency?

Answer: PM2

179. In the context of Node.js performance, what is "caching"?

Answer: Storing frequently accessed data in memory to reduce redundant computations and speed up responses

180. Which performance optimization technique in Node.js focuses on minimizing the number of external HTTP requests by bundling assets like JavaScript and CSS?

Answer: Asset bundling
Topic Tags
Node Js Interview Questions With Answers Node Js MCQ Node Js Multiple Choice Questions Node Js MCQ Questions And Answers