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StorageManager: persist() method

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.

Syntax

js

persist()

Parameters

None.

Return value

A Promise that resolves to a Boolean.

Example

js

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
Storage Standard
# ref-for-dom-storagemanager-persist

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
persist 55 79 57 No 42 15.2 55 55 57 42 15.2 6.0

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