What is Express.js? Quiz and Flashcards

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Questions and Answers

What is the purpose of routing in Express?

To install external libraries in Node.js

To create a basic web server in Node.js

To style HTML pages with CSS

To handle different requests and direct them to the appropriate pages (correct)

Why does the CSS style not work when accessing 'Localhost:8080/home' after adding it to the home.html file?

The HTML file is missing a tag

The CSS file is not linked properly in the HTML file (correct)

Express does not support CSS styling

The server is not running properly

What does Express provide out of the box for building server-side applications?

Database management tools

Machine learning capabilities

Client-side JavaScript functionalities

Basic web server features (correct)

How can middleware functions in Express affect the request-response cycle?

Execute any code, make changes to request and response objects, and call the next middleware function Signup and view all the answers

What folder should contain all HTML files when creating views in Express?

<code>views</code> folder Signup and view all the answers

Which term best describes Express as a web framework for Node.js?

Fast Signup and view all the answers

Which function in Express is used for routing requests?

get() Signup and view all the answers

What is middleware in Express?

A function that modifies the request and response objects Signup and view all the answers

Which function in Express is used for creating views?

render() Signup and view all the answers

What is sophisticated routing in Express?

Routing requests based on URL parameters Signup and view all the answers

Which of the following is not a performance optimization technique in Express?

Using synchronous functions Signup and view all the answers

What feature of Express allows for efficient handling of high traffic applications?

Its minimal design for performance Signup and view all the answers

Which of the following tasks can middleware functions in Express not perform?

Creating views Signup and view all the answers

How does Express support sophisticated URL-based routing?

By providing an intuitive API for managing different HTTP routes Signup and view all the answers

What is the main benefit of Express's flexibility?

It allows for integration with various database systems and templating engines Signup and view all the answers

What does Express not facilitate?

Use of a specific ORM or templating engine Signup and view all the answers

What is a middleware function in Express?

A function that has access to the request object, the response object, and the next middleware function Signup and view all the answers

Study Notes

Node.js and Express

Node.js is a platform for building server-side applications.
Express is a fast, unopinionated, and minimalist web framework for Node.js.
Express simplifies the process of building server-side applications with Node.js.

Routing

Routing in Node.js refers to the process of determining how an application responds to a client request to a particular endpoint or URL.
Express provides a sophisticated routing mechanism that allows managing different HTTP routes via a simple and intuitive API.
Routing is used to handle every request, and every page must be handled in routing.

HTTP Module

The http module is a core module in Node.js that allows creating HTTP servers and making HTTP requests.
The http module is used to create a server using http.createServer().
The listen() method is used to specify the port number on which the server will listen.

Request and Response Objects

The req object represents the HTTP request.
The res object represents the HTTP response.
Middleware functions can access the req and res objects and the next middleware function in the application's request-response cycle.

Middleware

Middleware functions are functions that have access to the req, res, and next middleware function in the application's request-response cycle.
Middleware functions can perform tasks such as modifying the req and res objects, ending the request-response cycle, calling the next middleware function in the stack, etc.
Middleware functions can be used to perform tasks such as logging, parsing request data, authentication, error handling, etc.

Creating a Server with Express

To create a server with Express, you need to require the Express module, create an app object, and specify a port number.
You can use the app.get() method to handle GET requests and the app.listen() method to start the server.

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Description

Test your knowledge on Express.js routing mechanism, HTTP method-based routing, performance optimization, and flexibility in ORM usage. Learn how Express facilitates efficient request handling and response sending for high traffic applications.