0.1.3 • Public • Published


    Problem: You need a large key-value store in the browser.

    To make things worse:

    • DOMStorage only gives you 5mb
    • Chrome doesn't let you store blobs in IndexedDB
    • Safari doesn't support IndexedDB,
    • IE and Firefox both support IndexedDB but not the FilesystemAPI.

    LargeLocalStorage bridges all of that to give you a large capacity (up to several GB when authorized by the user) key-value store in the browser (IE 10, Chrome, Safari 6+, Firefox, Opera).

    Basic Rundown / Examples

    Creating a database

    // Specify desired capacity in bytes
    var desiredCapacity = 125 * 1024 * 1024;
    // Create a 125MB key-value store
    var storage = new LargeLocalStorage({size: desiredCapacity, name: 'myDb'});
    // Await initialization of the storage area
    storage.initialized.then(function(grantedCapacity) {
      // Check to see how much space the user authorized us to actually use.
      // Some browsers don't indicate how much space was granted in which case
      // grantedCapacity will be 1.
      if (grantedCapacity != -1 && grantedCapacity != desiredCapacity) {

    Setting data

    // You can set the contents of "documents" which are identified by a key.
    // Documents can only contains strings for their values but binary
    // data can be added as attachments.
    // All operations are asynchronous and return Q promises
    storage.setContents('docKey', "the contents...").then(function() {
      alert('doc created/updated');
    // Attachments can be added to documents.
    // Attachments are Blobs or any subclass of Blob (e.g, File).
    // Attachments can be added whether or not a corresponding document exists.
    // setAttachment returns a promise so you know when the set has completed.
    storage.setAttachment('myDoc', 'titleImage', blob).then(function() {
        alert('finished setting the titleImage attachment');

    Retrieving Data

    // get the contents of a document
    storage.getContents('myDoc').then(function(content) {
    // Call getAttachment with the docKey and attachmentKey
    storage.getAttachment('myDoc', 'titleImage').then(function(titleImage) {
        // Create an image element with the retrieved attachment
        // (or video or sound or whatever you decide to attach and use)
        var img = new Image();
        img.src = URL.createObjectURL(titleImage);
    // If you just need a URL to your attachment you can get
    // the attachment URL instead of the attachment itself
    storge.getAttachmentURL('somePreviouslySavedDoc', 'someAttachment').then(function(url) {
      // do something with the attachment URL
      // ...
      // revoke the URL


    // You can do an ls to get all of the keys in your data store {
      // listing is a list of all of the document keys
    // Or get a listing of a document's attachments'somePreviouslySavedDoc').then(function(listing) {
      // listing is a list of all attachments belonging to `somePreviouslySavedDoc`


    // you can remove a document with rm
    // removing a document also removes all of that document's
    // attachments.
    // you can also rm an attachment
    storage.rmAttachment('someOtherDocKey', 'attachmentKey');
    // removals return promises as well so you know when the removal completes (or fails).
    storage.rm('docKey').then(function() {
    }, function(err) {
      console.error('Failed removal');
    // clear the entire database



    Include it on your page with a script tag:

    <script src="path/to/LargeLocalStorage.js"></script>

    Or load it as an amd module:

    define(['components/lls/dist/LargeLocalStorage'], function(lls) {
      var storage = new lls({size: 100 * 1024 * 1024});

    LLS depends on Q so you'll have to make sure you have that dependency.

    ##Getting downlad it directly

    Or bower install lls


    npm i largestorage

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