Storage API
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The Storage API enables web apps to store structured data in IndexedDB, Cache Storage, LocalStorage, and
SessionStorage. The available and used storage space can be obtained through
await navigator.storage.estimate() which returns a Promise that resolves to the
quota and usage properties that return the available and used storage space respectively.
In Chrome and Edge, an additional property usageDetails is returned that specifies the used space
by storage type which may vary per browser.
| Storage usage | |
|---|---|
| Available storage | |
| Used storage | |
Persistent storage
Web apps can request persistent storage which means that any data stored in IndexedDB and Cache Storage will no longer be deleted by the browser when for example storage space runs low or the user hasn't interacted with the app for a period of time.
The browser will retain the data as long as possible and in case it becomes necessary to remove data when storage space runs low, the browser will notify the user and provide a way to remove some data manually.
In supporting browsers, web apps can request persistent storage through navigator.storage.persist().
Permission is granted by the browser based on how much the user has interacted with the app and if the app is
installed as a PWA. To check if an app already has persistent storage, use
await navigator.storage.persisted() which returns a Promise that resolves to
true or false.
If persistent storage is not granted, try interacting with the app more or install it as a PWA.