StorageManager.persist()

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

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

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 box mode is persistent, and false otherwise.

Syntax

navigator.storage.persist().then(function(persistent) { ... })

Parameters

None.

Return value

A Promise that resolves to a Boolean.

Example

if (navigator.storage && navigator.storage.persist)
  navigator.storage.persist().then(function(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 (Storage) # 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	No	55	55	57	42	No	6.0

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