Book Image

Node.js Web Development - Fourth Edition

By : David Herron
Book Image

Node.js Web Development - Fourth Edition

By: David Herron

Overview of this book

Node.js is a server-side JavaScript platform using an event-driven, non-blocking I/O model allowing users to build fast and scalable data-intensive applications running in real time. This book gives you an excellent starting point, bringing you straight to the heart of developing web applications with Node.js. You will progress from a rudimentary knowledge of JavaScript and server-side development to being able to create, maintain, deploy and test your own Node.js application.You will understand the importance of transitioning to functions that return Promise objects, and the difference between fs, fs/promises and fs-extra. With this book you'll learn how to use the HTTP Server and Client objects, data storage with both SQL and MongoDB databases, real-time applications with Socket.IO, mobile-first theming with Bootstrap, microservice deployment with Docker, authenticating against third-party services using OAuth, and use some well known tools to beef up security of Express 4.16 applications.

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Table of Contents (19 chapters)
Title Page
Title Page
Dedication
Dedication
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
About Node.js
About Node.js
The capabilities of Node.js
Why should you use Node.js?
Threaded versus event-driven architecture
Embracing advances in the JavaScript language
Node.js, the microservice architecture, and easily testable systems
Node.js and the Twelve-Factor app model
Summary
2
Setting up Node.js
Setting up Node.js
System requirements
Installing Node.js using package managers
Installing from source on POSIX-like systems
Installing multiple Node.js instances with nvm
Native code modules and node-gyp
Node.js versions policy and what to use
Editors and debuggers
Running and testing commands
NPM – the Node.js package manager
Node.js, ECMAScript 2015/2016/2017, and beyond 
Summary
3
Node.js Modules
Node.js Modules
Defining a module
Finding and loading CommonJS and JSON modules using require
Finding and loading ES6 modules using import
Hybrid CommonJS/Node.js/ES6 module scenarios
npm - the Node.js package management system
The Yarn package management system
Summary
4
HTTP Servers and Clients
HTTP Servers and Clients
Sending and receiving events with EventEmitters
HTTP server applications
ES2015 multiline and template strings
HTTP Sniffer – listening to the HTTP conversation
Web application frameworks
Getting started with Express
Calculating the Fibonacci sequence with an Express application
Making HTTP Client requests
Calling a REST backend service from an Express application
Summary
5
Your First Express Application
Your First Express Application
Promises, async functions, and Express router functions
Express and the MVC paradigm
Creating the Notes application
Theming your Express application
Scaling up – running multiple Notes instances
Summary
6
Implementing the Mobile-First Paradigm
Implementing the Mobile-First Paradigm
Problem – the Notes app isn't mobile friendly
Mobile-first paradigm
Using Twitter Bootstrap on the Notes application
Flexbox and CSS Grids
Mobile-first design for the Notes application
Building a customized Bootstrap
Summary
7
Data Storage and Retrieval
Data Storage and Retrieval
Data storage and asynchronous code
Logging
Using the ES6 module format
Storing notes in the filesystem
Storing notes with the LevelUP data store
Storing notes in SQL with SQLite3
Storing notes the ORM way with Sequelize
Storing notes in MongoDB
Summary
8
Multiuser Authentication the Microservice Way
Multiuser Authentication the Microservice Way
Creating a user information microservice
Securely keeping secrets and passwords
The Notes application stack
Summary
9
Dynamic Client/Server Interaction with Socket.IO
Dynamic Client/Server Interaction with Socket.IO
Introducing Socket.IO
Initializing Socket.IO with Express
Real-time updates on the Notes homepage
Inter-user chat and commenting for Notes
Summary
10
Deploying Node.js Applications
Deploying Node.js Applications
Notes application architecture and deployment considerations
Traditional Linux Node.js service deployment
Node.js microservice deployment with Docker
Summary
11
Unit Testing and Functional Testing
Unit Testing and Functional Testing
Assert – the basis of testing methodologies
Testing a Notes model
Using Docker to manage test infrastructure
Testing REST backend services
Automating test results reporting
Frontend headless browser testing with Puppeteer
Summary
12
Security
Security
HTTPS/TLS/SSL using Let's Encrypt
Put on your Helmet for across-the-board security
Addressing Cross-Site Request Forgery (CSRF) attacks
Denying SQL injection attacks
Scanning for known vulnerabilities
Using good cookie practices
Summary
Other Books You May Enjoy
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index
Index

Frontend headless browser testing with Puppeteer

A big cost area in testing is manual user interface testing. Therefore, a wide range of tools have been developed to automate running tests at the HTTP level. Selenium is a popular tool implemented in Java, for example. In the Node.js world, we have a few interesting choices. The chai-http plugin to Chai would let us interact at the HTTP level with the Notes application, while staying within the now-familiar Chai environment. 

However, for this section, we'll use Puppeteer (https://github.com/GoogleChrome/puppeteer). This tool is a high-level Node.js module to control a headless Chrome or Chromium browser, using the DevTools protocol. That protocol allows tools to instrument, inspect, debug, and profile Chromium or Chrome. 

Puppeteer is meant to be a general purpose test automation tool, and has a strong feature set for that purpose. Because it's easy to make web page screenshots with Puppeteer, it can also be used in a screenshot service.

Because...

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