dom-storage

W3C DOM Storage (localStorage and sessionStorage) for Node.JS

npm install dom-storage
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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, ws: '  ' })

    // 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

Options

  • strict - whether to stringify strictly as text [Object object] or as json { foo: bar }.
  • ws - the whitespace to use saving json to disk. Defaults to ' '.

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)
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