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StorageManager

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

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The StorageManager interface of the the Storage API provides an interface for managing persistance permissions and estimating available storage. You can get a reference to this interface using either navigator.storage or WorkerNavigator.storage.

Methods

StorageManager.estimate() Secure context: Returns a StorageEstimate object containing usage and quota numbers for your origin.
StorageManager.persist() Secure context: Returns a Promise that resolves to true if the user agent is able to persist your site's storage.
StorageManager.persisted() Secure context: Returns a Promise that resolves to true if persistence has already been granted for your site's storage.

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	48	?	57 57 51 — 57 Disabled See bug 1304966 and bug 1399038. Disabled From version 51 until version 57 (exclusive): this feature is behind the `dom.storageManager.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	?	Yes	?
`estimate`	52	?	51	?	Yes	?
`persist`	52 52 48 — 52 Uses the non-standard name: `requestPersistent`	?	55	?	Yes	?
`persisted`	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	?	55	?	Yes	?

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	48	48	?	51 Disabled 51 Disabled See bug 1304966 and bug 1399038. Disabled From version 51: this feature is behind the `dom.storageManager.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Yes	?	?
`estimate`	52	52	?	51	Yes	?	?
`persist`	52 52 48 — 52 Uses the non-standard name: `requestPersistent`	52 52 48 — 52 Uses the non-standard name: `requestPersistent`	?	55	Yes	?	?
`persisted`	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	52 52 48 — 52 Uses the non-standard name: `persistentPermission`	?	55	Yes	?	?

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https://developer.mozilla.org/en-US/docs/Web/API/StorageManager