This API is available on Firefox OS for internal applications only.

The readOnly read-only property of the DataStore interface returns a boolean indicating whether the current data store is read-only.

Note: The Data Store API is available in Web Workers, from Firefox 32 onwards (Firefox OS 2.0; see bug 949325.)


myStoreName = store.readOnly;


A boolean.


The following example gets all the data stores on the device called "contacts", then logs its read-only status to the console:

navigator.getDataStores('contacts').then(function(stores) {


Specification Status Comment
Data Store API
The definition of 'readOnly' in that specification.

The discussion concerning this API's creation happened in various Mozilla mailing lists and other places. A summary of the discussion and further pointers can be found on the Mozilla Wiki. For further feedback and questions, send mail to the dev-webapi mailing list.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support No support No support No support No support No support
Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support No support No support No support 1.0.1 No support No support No support
Available in web workers No support No support No support 2.0 No support No support No support

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API B2G Data Store Data Store API Database DataStore Firefox OS Property readOnly Reference Référence storage Storage