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)
var localStorage = new Storage('./db.json', { strict: false, ws: '  ' });

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

var 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)

License

Dual-licensed MIT and Apache-2.0

Docs released under Creative Commons.

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