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.

71. In Node.js, what are streams primarily used for?

Answer: Handling large amounts of data efficiently, especially for reading or writing data sequentially

72. What is a key advantage of using streams in Node.js for I/O operations?

Answer: Streams allow data to be processed piece by piece, reducing memory consumption and improving performance.

73. In Node.js, which core module provides the foundation for working with streams?

Answer: stream

74. What is a readable stream in Node.js?

Answer: A stream that can only be read from

75. What is a writable stream in Node.js?

Answer: A stream that can only be written to

76. In Node.js, which method is commonly used to pipe data from a readable stream to a writable stream?

Answer: stream.pipe()

77. What is the purpose of the fs.createReadStream method in Node.js?

Answer: To create a readable stream for reading data from a file

78. What is the purpose of the fs.createWriteStream method in Node.js?

Answer: To create a writable stream for writing data to a file

79. What is a duplex stream in Node.js?

Answer: A stream that can be both read from and written to

80. Which event is emitted by a readable stream when it reaches the end of the data?

Answer: end
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