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.

151. What is the primary purpose of error handling in Node.js applications?

Answer: To gracefully handle unexpected errors and prevent application crashes

152. In Node.js, how can you catch and handle errors that occur during the execution of synchronous code?

Answer: By using the try...catch statement

153. What is the purpose of the Error object in Node.js error handling?

Answer: To represent a caught exception or error, providing information such as the error message and stack trace

154. In Node.js, what is the role of the process.on('uncaughtException') event handler for error handling?

Answer: To handle uncaught exceptions and prevent the application from exiting abruptly

155. Which Node.js module is commonly used for logging and error management in applications?

Answer: winston

156. What is the primary purpose of testing in Node.js development?

Answer: To identify and fix bugs and errors in the application code

157. Which testing framework is commonly used for unit testing in Node.js?

Answer: Mocha

158. In Node.js unit testing, what is a test suite?

Answer: A group of related test cases that are executed together

159. What is the purpose of a test runner in Node.js unit testing?

Answer: To execute test cases and provide the test results

160. What does "TDD" stand for in the context of Node.js testing?

Answer: Test-Driven Development
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