jStorage is a cross-browser key-value store database to store data locally in the browser - jStorage supports all major browsers, both in desktop (yes - even Internet Explorer 6) and in mobile.

Additionally jStorage is library agnostic, it works well with any other JavaScript library on the same webpage, be it jQuery, Prototype, MooTools or something else. Though you still need to have either a third party library (Prototype, MooTools) or JSON2 on the page to support older IE versions.

jStorage supports storing Strings, Numbers, JavaScript objects, Arrays and even native XML nodes which kind of makes it a JSON storage. jStorage also supports setting TTL values for auto expiring stored keys and - best of all - notifying other tabs/windows when a key has been changed, which makes jStorage also a local PubSub platform for web applications.

jStorage is pretty small, about 10kB when minified, 4kB gzipped.

If jStorage is loaded on the page localStorage and sessionStorage polyfills are added to IE6 and IE7 in addition to regular $.jStorage methods. You can use regular setItem/getItem methods with the polyfills but getter/setters can be used as well:

localStorage.mykey = myval;

is absolutely valid with jStorage. The only downside is that you can't use onstorage event, you need to fall back to listenKeyChange instead.

Support jStorage development

jStorage supports the following features:

• store and retrieve data from browser storage using any JSON compatible data format (+ native XML nodes)
• set TTL values to stored keys for auto expiring
• publish and subscribe to cross-window/tab events
• listen for key changes (update, delete) from the current or any other browser window
• use any browser since IE6, both in desktop and in mobile

Current availability: jStorage supports all major browsers - Internet Explorer 6+, Firefox 2+, Safari 4+, Chrome 4+, Opera 10.50+

If the browser doesn't support data caching, then no exceptions are raised - jStorage can still be used by the script but nothing is actually stored.

See tests/testrunner.html for unit tests

NB! - listenKeyChange and publish/subscribe tests tend to fail sometimes in Internet Explorer, which should be ok.

Project homepage and docs: www.jstorage.info

MIT