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
101. What is routing in the context of Node.js web applications?
A. Managing hardware devices
B. Defining the path and handling of HTTP requests based on the requested URL
C. Handling database migrations
D. Managing user authentication
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Answer: Defining the path and handling of HTTP requests based on the requested URL
102. In Express.js, how is routing typically defined for handling HTTP requests?
A. Using the app.middleware method
B. Using the app.route method
C. Using the app.use method
D. Using the app.process method
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Answer: Using the app.route method
103. What is a route parameter in Express.js routing?
A. A route that requires special authentication
B. A placeholder in a route URL that can capture values from the URL and make them available to the route handler
C. A middleware function for error handling
D. A route defined for static file serving
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Answer: A placeholder in a route URL that can capture values from the URL and make them available to the route handler
104. In Express.js routing, how do you define a route parameter in a route URL pattern?
A. Using the param keyword
B. By enclosing it in curly braces {}
C. Using the req.param() method
D. By adding a dollar sign $ before the parameter name
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Answer: By enclosing it in curly braces {}
105. What HTTP verb is typically used for retrieving data from the server in Express.js routing?
A. GET
B. POST
C. PUT
D. DELETE
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Answer: GET
106. What is the purpose of the app.get() method in Express.js routing?
A. To define a new route for updating data
B. To define a new route for deleting data
C. To define a new route for retrieving data using the GET HTTP verb
D. To define a new route for creating data
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Answer: To define a new route for retrieving data using the GET HTTP verb
107. In Express.js routing, what is the purpose of the req and res objects in a route handler function?
A. To specify route parameters
B. To define the route URL pattern
C. To represent the incoming request and the outgoing response, respectively
D. To handle database migrations
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Answer: To represent the incoming request and the outgoing response, respectively
108. What is the primary benefit of using route parameters in Express.js routing?
A. They provide a way to hide sensitive information in URLs.
B. They allow for dynamic routing based on values captured from the URL.
C. They simplify the creation of HTML templates.
D. They are used for error handling.
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Answer: They allow for dynamic routing based on values captured from the URL.
109. What is a route handler function in Express.js routing?
A. A function that serves static files
B. A function that defines route parameters
C. A function responsible for processing an HTTP request and generating an HTTP response for a specific route
D. A function that manages database connections
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Answer: A function responsible for processing an HTTP request and generating an HTTP response for a specific route
110. In Express.js, what is the purpose of the app.use() method when defining middleware for routing?
A. To define static file serving
B. To define error-handling middleware
C. To specify route handlers for all routes
D. To establish network connections
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Answer: To specify route handlers for all routes
