StorageManager: persist() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2021.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The persist() method of the StorageManager interface requests permission to use persistent storage, and returns a Promise that resolves to true if permission is granted and bucket mode is persistent, and false otherwise. The browser may or may not honor the request, depending on browser-specific rules. (For more details, see the guide to Storage quotas and eviction criteria.)
Note:
This method is not available in Web Workers, though the StorageManager interface is.
Syntax
persist()
Parameters
None.
Return value
Exceptions
TypeError-
Thrown if obtaining a local storage shelf failed. For example, if the current origin is an opaque origin or if the user has disabled storage.
Example
if (navigator.storage && navigator.storage.persist) {
navigator.storage.persist().then((persistent) => {
if (persistent) {
console.log("Storage will not be cleared except by explicit user action");
} else {
console.log("Storage may be cleared by the UA under storage pressure.");
}
});
}
Specifications
| Specification |
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| Storage # dom-storagemanager-persist |
Browser compatibility
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Legend
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- Full support
- Full support