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.

191. What is "SQL injection," and how can it be prevented in a Node.js application?

Answer: An attack where malicious SQL queries are injected into user inputs to manipulate the database

192. Which authentication method is considered more secure than storing passwords in plain text in a Node.js application's database?

Answer: Bcrypt hashing

193. In Node.js, what is the purpose of using a secure connection (HTTPS) over HTTP for web communication?

Answer: To encrypt data transmission to protect against eavesdropping and man-in-the-middle attacks

194. What is Cross-Site Request Forgery (CSRF) in the context of web security, and how can it be mitigated in Node.js applications?

Answer: An attack where an authenticated user unknowingly performs actions on a different website

195. Which tool or library in Node.js is commonly used for scanning and identifying security vulnerabilities in the application code?

Answer: npm audit

196. What is the primary goal of deploying a Node.js application to a production server?

Answer: To make the application available for public use with high reliability and performance

197. Which web server software is commonly used for serving Node.js applications in production?

Answer: Nginx

198. What is the purpose of a reverse proxy server like Nginx when deploying a Node.js application?

Answer: To improve security and performance by handling incoming requests and load balancing

199. In the context of production deployment, what does the term "load balancing" refer to?

Answer: The distribution of incoming traffic across multiple server instances to improve scalability and reliability

200. What is the role of process managers like PM2 when deploying a Node.js application to a production server?

Answer: To monitor and manage Node.js processes, ensure they stay running, and provide features like auto-restart
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