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Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The StorageEstimate dictionary is used by the StorageManager to provide estimates of the size of a site's or application's data store and how much of it is in use. The estimate() method returns an object that conforms to this dictionary when its Promise resolves.

These values are only estimates for several reasons, including both performance and preventing storage capacity data from being used for fingerprinting purposes. See the individual property pages for details.

Properties

quota Secure context
A numeric value in bytes which provides a conservative approximation of the total storage the user's device or computer has available for the site origin or Web app. It's possible that there's more than this amount of space available though you can't rely on that being the case.
usage Secure context
A numeric value in bytes approximating the amount of storage space currently being used by the site or Web app, out of the available space as indicated by quota. Unit is byte.
usageDetails Secure context
A dictionary containing a breakdown of usage by storage system.  All included members will have a usage greater than 0 and any storage system with 0 usage will be excluded from the dictionary.  

Specifications

Specification Status Comment
Storage
The definition of 'StorageEstimate' in that specification.
Living Standard Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
StorageEstimateChrome Full support 52Edge Full support ≤79Firefox Full support 51IE No support NoOpera Full support 42Safari ? WebView Android Full support 52Chrome Android Full support 52Firefox Android Full support 51Opera Android Full support 42Safari iOS ? Samsung Internet Android Full support 6.0
quotaChrome Full support 52Edge Full support ≤79Firefox Full support 51IE No support NoOpera Full support 42Safari ? WebView Android Full support 52Chrome Android Full support 52Firefox Android Full support 51Opera Android Full support 42Safari iOS ? Samsung Internet Android Full support 6.0
usageChrome Full support 52Edge Full support ≤79Firefox Full support 51IE No support NoOpera Full support 42Safari ? WebView Android Full support 52Chrome Android Full support 52Firefox Android Full support 51Opera Android Full support 42Safari iOS ? Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

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