Section 1.1: Express.js

Express is the most widely-used web server framework for Node.js. Its user-friendly interface, flexible architecture, and speed make it a top choice for developers. There are numerous libraries that complement Express, such as cookie-parser for cookie management, multer for file uploads, and http-proxy-middleware for request proxying. The extensive community surrounding Express not only creates and maintains these libraries but also provides answers to various queries on platforms like Stack Overflow.

Section 1.2: Socket.io

Socket.io is a renowned library designed for managing web sockets seamlessly. It addresses complex tasks, such as broadcasting messages to groups or all users, and introduces features that enhance the older WebSocket (ws) versions. This library streamlines backend syntax, allowing clients to simply add events and manage them on both ends.

Section 1.3: Puppeteer

Puppeteer offers an API to control Chrome/Chromium, primarily used for web scraping, testing single-page applications, and automated web testing. It can operate in headless mode, meaning the browser doesn’t open a visible window, making it convenient for server-side execution via CLI (Command Line Interface). Alternatively, it can run in head mode, allowing you to see the browser being manipulated as if a user were clicking or typing.

Section 1.4: Ajv

Ajv enables developers to perform quick and easy data validations through JSON schema definitions, without extensive coding. It is often paired with Express for validating incoming data.

const schema = {

properties: {

foo: {type: "int32"}

},

optionalProperties: {

bar: {type: "string"}

}

};

const validate = ajv.compile(schema);

const data = {

foo: 1,

bar: "abc"

};

console.log(validate(data)); // true

Section 1.5: Chart.js

Chart.js is a versatile chart rendering library that is highly customizable and extendable, offering various types of charts including line, pie, and bar. Its general compatibility allows it to be used with nearly any frontend framework, including Vue, React, or plain JavaScript.