node-localstorage

What is node-localstorage?

The node-localstorage npm package provides a simple way to emulate the browser's localStorage API in a Node.js environment. This is particularly useful for storing data persistently across sessions in a Node.js application.

What are node-localstorage's main functionalities?

Set Item

This feature allows you to store a key-value pair in the local storage. The data is saved persistently in the specified directory.

const { LocalStorage } = require('node-localstorage');
const localStorage = new LocalStorage('./scratch');
localStorage.setItem('myKey', 'myValue');

Get Item

This feature allows you to retrieve the value associated with a given key from the local storage.

const { LocalStorage } = require('node-localstorage');
const localStorage = new LocalStorage('./scratch');
const value = localStorage.getItem('myKey');
console.log(value);

Remove Item

This feature allows you to remove a key-value pair from the local storage.

const { LocalStorage } = require('node-localstorage');
const localStorage = new LocalStorage('./scratch');
localStorage.removeItem('myKey');

Clear Storage

This feature allows you to clear all key-value pairs from the local storage.

const { LocalStorage } = require('node-localstorage');
const localStorage = new LocalStorage('./scratch');
localStorage.clear();

Other packages similar to node-localstorage

localStorage

The localStorage package provides a similar API to node-localstorage but is designed to be a more lightweight and minimalistic solution. It offers basic localStorage functionalities but may lack some of the more advanced features and configurability of node-localstorage.

node-persist

The node-persist package offers a more feature-rich and flexible solution for persistent storage in Node.js. It supports various storage backends and provides additional features like data expiration and encryption, making it a more robust alternative to node-localstorage.

electron-store

The electron-store package is designed specifically for Electron applications but can also be used in Node.js. It provides a simple API for persistent storage and supports JSON schema validation, making it a good choice for applications that require more structured data storage.

README

node-localstorage

Copyright (c) 2012, Lawrence S. Maccherone, Jr.

A drop-in substitute for the browser native localStorage API that runs on node.js.

Fully implements the localStorage specfication including:

• All methods in the localStorage spec interface including:
  • length
  • setItem(key, value)
  • getItem(key)
  • removeItem(key)
  • key(n)
  • clear()
• Serializes to disk in the location specified during instantiation
• Supports the setting of a quota (default 5MB)
• Events. Follows the spec in all ways that make sense for node.js. However, the spec states that events are NOT supposed to be emitted to the browser window that took the action that triggered the event in the first place. Since we don't really have the equivalent of a browser window in node.js, we trigger events in the current process.
• Associative array localStorage['myKey'] = 'myValue' and dot property localStorage.myKey = 'myValue' syntax. If you are in an ES6 supported environment.

Limitations:

• When using Associative array or dot property syntax, you cannot use keys that collide with my "private" properties and methods including keys that start with "_" like "_init"
• If you specify a location that already has files in it when you create an instance, you might already exceed the quota or might do so sooner than you expect. This is intentional because we want it to behave like the browser and persist the storage even after your program is restarted.

Credits

Author: Larry Maccherone

Usage

CoffeeScript

unless localStorage?
  {LocalStorage} = require('../')  # require('node-localstorage') for you
  localStorage = new LocalStorage('./scratch')

localStorage.setItem('myFirstKey', 'myFirstValue')
console.log(localStorage.getItem('myFirstKey'))
# myFirstValue

localStorage._deleteLocation()  # cleans up ./scratch created during doctest

ReactJs

Open or create src/setupTests.js and add these two lines:

// /src/setupTests.js
import { LocalStorage } from "node-localstorage";

global.localStorage = new LocalStorage('./scratch');

JavaScript

if (typeof localStorage === "undefined" || localStorage === null) {
  var LocalStorage = require('node-localstorage').LocalStorage;
  localStorage = new LocalStorage('./scratch');
}

localStorage.setItem('myFirstKey', 'myFirstValue');
console.log(localStorage.getItem('myFirstKey'));

Polyfill on Node.js

Polyfil your node.js environment with this as the global localStorage when launching your own code

node -r node-localstorage/register my-code.js

Installation

npm install node-localstorage

Changelog

• 2.2.1 - 2021-06-04 - Fixed serveral small issues reported by users
• 2.1.7 - 2020-06-08 - Fixed stringifying null and undefined (thanks @gamesaucer)
• 2.1.6 - 2020-04-10 - Fix backward compatibility bug (thanks @WillBartee)
• 2.1.5 - 2019-12-02 - Fixed empty string key(n) return (@appy-one, thanks for reporting)
• 2.1.2 thru 2.1.4 - 2019-11-17 - Upgrading and testing npm publish scripts
• 2.1.1 - 2019-11-17 - npm publish cleanup
• 2.1.0 - 2019-11-17 - Added back dot-property and associative-array syntax using ES6 Proxy
• 2.0.0 - 2019-11-17 - Updated all the depdendencies, added ability to register as polyfill (thanks @dy)
• 1.3.1 - 2018-03-19 - Resolves issue #32 (thanks, plamens)
• 1.3.0 - 2016-04-09 - Possibly backward breaking if you were using experimental syntax Reverted experimental associative array and dot-property syntax. The API for Proxy changed with node.js v6.x which broke it. Then when I switched to the new syntax, it broke the EventEmitter functionality. Will restore once I know how to fix that.
• 1.2.0 - 2016-04-09 - Atomic writes (thanks, mvayngrib)
• 1.1.2 - 2016-01-08 - Resolves issue #17 (thanks, evilaliv3)
• 1.1.1 - 2016-01-04 - Smarter associative array and dot-property syntax support
• 1.1.0 - 2016-01-03 - Backward breaking if you used any of the non-standard methods. They are now all preceded with an underscore. Big upgrade for this version is experimental support for associative array and dot-property syntax.
• 1.0.0 - 2016-01-03 - Fixed bug with empty string key (thanks, tinybike)
• 0.6.0 - 2015-09-11 - Removed references to deprecated fs.existsSync() (thanks, josephbosire)
• 0.5.2 - 2015-08-01 - Fixed defect where keys were not being updated correctly by removeItem() (thanks, ed69140)
• 0.5.1 - 2015-06-01 - Added support for events
• 0.5.0 - 2015-02-02 - Added JSONStorage class which allows you set and get native JSON
• 0.4.1 - 2015-02-02 - More robust publishing/tagging (like Lumenize)
• 0.4.0 - 2015-02-02 - Uses more efficient fs.statSync to set initial size (thanks, sudheer594)
• 0.3.6 - 2014-12-24 - Allows usage without new
• 0.3.5 - 2014-12-23 - Fixed toString() for QuotaExceededError
• 0.3.4 - 2013-07-07 - Moved CoffeeScript to devDependencies
• 0.3.3 - 2013-04-05 - Added support for '/' in keys by escaping before creating file names
• 0.3.2 - 2013-01-19 - Renamed QuotaExceededError to QUOTA_EXCEEDED_ERR to match most browsers
• 0.3.1 - 2013-01-19 - Fixed bug where it threw plain old Error instead of new QuotaExceededError
• 0.3.0 - 2013-01-19 - Added QuotaExceededError support
• 0.2.0 - 2013-01-03 - Added quota support
• 0.1.2 - 2012-11-02 - Finally got Travis CI working
• 0.1.1 - 2012-10-29 - Update to support Travis CI
• 0.1.0 - 2012-10-29 - Original version