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.
Table of Contents (19 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Chapter 7. Data Storage and Retrieval

In the previous two chapters, we built a small and somewhat useful application for storing notes, and then made it work on mobile devices. While the application works reasonably well, it doesn't store those notes anywhere on a long-term basis, meaning the notes are lost when you stop the server and, if you run multiple instances of Notes, each instance has its own set of notes. The typical next step is to introduce a database tier. 

In this chapter, we will look at database support in Node.js, so the user sees the same set of notes for any Notes instance accessed, and to reliably store notes for long-term retrieval.

We'll start with the Notes application code used in the previous chapter. We started with a simple, in-memory data model using an array to store the notes, and then made it mobile friendly. In this chapter, we will:

  • Discover logging operational and debugging information
  • Begin using the ES6 module format
  • Implement data persistence for Notes objects...