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 level@2.1.x --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 =...