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

The put() method of the DataStore interface updates an existing record in the data store.

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


store.put(obj, id).then(function(id) {
  // Do something with id, which is the id of the updated object


A Promise object of type void that resolves with the ID of the updated object.


The object containing the data you want to update the record's value to.
The id of the record to be updated. This will be either a DataStoreKey of type unsigned long or DOMString, if an id was specified by the developer when the record was created, or a numeric id if not.
You can specify an optional third parameter that will be a revisionId (a DOMString). This can be used to prevent conflicts. If the revisionId is not the current revisionId for the current Data Store, the operation is aborted. This means that the developer has a 'old' revisionId and will have to manage the conflict somehow.


The following example gets all the data stores on the device called "contacts", then updates a single record in the first "contacts" data store with the data available in the obj variable.

navigator.getDataStores('contacts').then(function(stores) {
  stores[0].put(obj,1).then(function(id) {
    // object successfully updated


Specification Status Comment
Data Store API Draft  

Note that put() isn't currently defined in the spec, but this should be updated soon. It will replace the now-deprecated update() method.

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 Method put Reference Référence Storage storage