dom-storage

What is dom-storage?

The dom-storage npm package is a simple implementation of the W3C DOM Storage API, which provides a way to store key-value pairs in a web browser. It is useful for server-side JavaScript environments like Node.js where the browser's localStorage and sessionStorage are not available.

What are dom-storage's main functionalities?

localStorage

This feature allows you to use localStorage in a Node.js environment. You can set, get, remove, and clear items just like you would in a browser.

const { LocalStorage } = require('dom-storage');
const localStorage = new LocalStorage('./localStorage');

// Set an item
localStorage.setItem('key', 'value');

// Get an item
const value = localStorage.getItem('key');
console.log(value); // Outputs: 'value'

// Remove an item
localStorage.removeItem('key');

// Clear all items
localStorage.clear();

sessionStorage

This feature allows you to use sessionStorage in a Node.js environment. You can set, get, remove, and clear items just like you would in a browser.

const { SessionStorage } = require('dom-storage');
const sessionStorage = new SessionStorage();

// Set an item
sessionStorage.setItem('key', 'value');

// Get an item
const value = sessionStorage.getItem('key');
console.log(value); // Outputs: 'value'

// Remove an item
sessionStorage.removeItem('key');

// Clear all items
sessionStorage.clear();

Other packages similar to dom-storage

node-localstorage

node-localstorage is another package that provides a localStorage API for Node.js. It is similar to dom-storage but focuses solely on localStorage functionality. It also supports persistence by writing data to disk.

localstorage-memory

localstorage-memory is an in-memory implementation of the localStorage API for Node.js. Unlike dom-storage, it does not persist data to disk, making it suitable for testing and temporary storage.

node-persist

node-persist is a more general-purpose storage library for Node.js that supports both key-value storage and JSON object storage. It offers more flexibility compared to dom-storage but may be overkill if you only need localStorage or sessionStorage functionality.

README

sessionStorage & localStorage for NodeJS

An inefficient, but as W3C-compliant as possible using only pure JavaScript, DOMStorage implementation.

Purpose

This is meant for the purpose of being able to run unit-tests and such for browser-y modules in node.

Usage

var Storage = require('dom-storage')

    // in-file, doesn't call `String(val)` on values (default)
  , localStorage = new Storage('./db.json', { strict: false })

    // in-memory, does call `String(val)` on values (i.e. `{}` becomes `'[object Object]'`
  , sessionStorage = new Storage(null, { strict: true })

  , myValue = { foo: 'bar', baz: 'quux' }
  ;

localStorage.setItem('myKey', myValue);
myValue = localStorage.getItem('myKey');

// use JSON to stringify / parse when using strict w3c compliance
sessionStorage.setItem('myKey', JSON.stringify(myValue));
myValue = JSON.parse(localStorage.getItem('myKey'));

API

• getItem(key)
• setItem(key, value)
• removeItem(key)
• clear()
• key(n)
• length

Tests

0 === localStorage.length;
null === localStorage.getItem('doesn't exist');
undefined === localStorage['doesn't exist'];

localStorage.setItem('myItem');
"undefined" === localStorage.getItem('myItem');
1 === localStorage.length;

localStorage.setItem('myItem', 0);
"0" === localStorage.getItem('myItem');

localStorage.removeItem('myItem', 0);
0 === localStorage.length;

localStorage.clear();
0 === localStorage.length;

Notes

• db is read in synchronously
• No callback when db is saved
• Doesn't not emit Storage events (not sure how to do)