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.

251. Which Node.js tool is commonly used for enforcing and automatically formatting code according to a specific coding style?

Answer: ESLint

252. In Node.js development, what is the recommended naming convention for variables and functions?

Answer: CamelCase (e.g., myVariable)

253. What is the purpose of using comments in Node.js code?

Answer: To explain the code's functionality, logic, and usage

254. What is "callback hell" in the context of Node.js development, and how can it be mitigated?

Answer: A coding style that involves nested callbacks, making the code hard to read and maintain

255. Which Node.js module is commonly used for handling asynchronous operations and avoiding callback hell?

Answer: async

256. When should error handling be implemented in Node.js code?

Answer: Error handling should be implemented for all possible error scenarios to ensure robustness.

257. What is the purpose of "promises" in Node.js development, and how do they differ from callbacks?

Answer: Promises are a way to handle asynchronous operations in a more readable and structured manner compared to callbacks.

258. Which HTTP status code should be returned when a requested resource is not found in a Node.js web application?

Answer: 404 Not Found

259. In Node.js, what is the purpose of the "try...catch" statement in error handling?

Answer: To catch and handle exceptions or errors that occur within a block of code
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