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.
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Practice Test
81. What is the primary purpose of an HTTP server in Node.js?
A. Playing audio files
B. Handling HTTP requests and providing responses
C. Managing database migrations
D. Running background tasks
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Answer: Handling HTTP requests and providing responses
82. In Node.js, which core module is commonly used to create HTTP servers?
A. http
B. fs
C. net
D. url
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Answer: http
83. What does "HTTP" stand for in "HTTP server" in Node.js?
A. HyperText Transfer Protocol
B. High Throughput Protocol
C. Heavy Transport Protocol
D. Home Transfer Protocol
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Answer: HyperText Transfer Protocol
84. What is a key characteristic of an HTTP server in Node.js?
A. It can only handle a single request at a time.
B. It can only respond with text-based data.
C. It can handle multiple simultaneous HTTP requests and responses.
D. It can only be used for local communication.
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Answer: It can handle multiple simultaneous HTTP requests and responses.
85. Which method is commonly used to create an HTTP server in Node.js and start it on a specified port?
A. createServer
B. startServer
C. initializeServer
D. http.createServer
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Answer: http.createServer
86. How can you listen for incoming HTTP requests on a specific port using the http module in Node.js?
A. By using the http.on method
B. By calling the http.listen method on the server object
C. By calling the http.receive method
D. By using the http.request method
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Answer: By calling the http.listen method on the server object
87. What is the default port for HTTP communication in most web applications?
A. 80
B. 443
C. 8080
D. 8000
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Answer: 80
88. In an HTTP server created with Node.js, what is the primary purpose of a request handler function?
A. To manage the server's database
B. To send audio files to clients
C. To process incoming HTTP requests and generate appropriate responses
D. To create HTML templates
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Answer: To process incoming HTTP requests and generate appropriate responses
89. What HTTP status code is typically returned when a requested resource is not found on the server?
A. 200 (OK)
B. 404 (Not Found)
C. 500 (Internal Server Error)
D. 302 (Found)
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Answer: 404 (Not Found)
90. In Node.js, what is the purpose of the res object in an HTTP request handler function?
A. To store client requests
B. To define the server's routing
C. To represent the HTTP response that will be sent back to the client
D. To read data from files
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Answer: To represent the HTTP response that will be sent back to the client
