Quick-storage NPM

QuickStorage

Simple key/value storage module with persistency on file system.

This module used to work in the browser with IndexedDB, more info can be found here https://github.com/BonneVoyager/quick-storage/tree/v1.4.0.

Installation

npm install --save quick-storage

Usage

QuickStorage expects an argument - a path to store data in the file system (otherwise, it will throw).

import QuickStorage from 'quick-storage'
const myStorage = new QuickStorage(`${__dirname}/data`)

This will create ${__dirname}/data directory and store data in it. Each data key will be stored in separate file (key myKey will be store in file ${__dirname}/data/myKey). File content is stringified on write, and parsed on read.

API

myStorage.set('myKey', { foo: 'bar' })

myStorage.has('myKey') // true

myStorage.get('myKey') // { "foo": "bar" }

myStorage.keys() // [ "foo" ]

myStorage.delete('myKey')

myStorage.isReady // false before onReady callback, and true afterwards

myStorage.onReady((fn) => {
  console.info('All previous data was read and I am ready for some work!')
})

myStorage.onError((err) => {
  console.error('My storage error:', err)
})

const obj = { foo: "bar" }
myStorage.proxy(obj, {
  preventExtensions: true, // whether to invoke Object.preventExtensions(obj)
  persistProps: [ 'foo' ]  // props which should keep the persistency
})

Few tips

please keep in mind that this module is intended to be used with small chunks of data (up to dozens of megabytes). All the data is stored in memory with Map cache object.
data is parsed between string and json. That means that this module works only with JSON objects.
when you create QuickStorage(__dirname + '/data'), the script will try to find and read data associated with __dirname + '/data' (read FS on the server). After it's read, storage object will call onReady function.
you can use a callback as a second argument for get function to force read the data from the FS, instead of Map cache object.