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 (14 chapters)

Storing notes with the LevelUP data store


To get started with actual databases, let's look at an extremely lightweight, small-footprint database engine: LevelUP. This is a Node.js-friendly wrapper around the LevelDB engine developed by Google, which is normally used in web browsers for local data persistence. It is a non-indexed, NoSQL data store designed originally for use in browsers. The Node.js module, Level, uses the LevelDB API, and supports multiple backends, including LevelDOWN, which integrates the C++ LevelDB database into Node.js.

Visit https://www.npmjs.com/package/level for information on the module. The level package automatically sets up the levelup and leveldown packages. 

To install the database engine, run this command:

$ npm install [email protected] --save

Then, start creating the models/notes-level.mjs module:

import fs from 'fs-extra';
import path from 'path';
import util from 'util';
import Note from './Note';
import level from 'level';
import DBG from 'debug';
const debug =...