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Window.localStorage
The read-only localStorage property allows you to access a Storage object for the Document's origin; the stored data is saved across browser sessions. localStorage is similar to sessionStorage, except that while data stored in localStorage has no expiration time, data stored in sessionStorage gets cleared when the page session ends - that is, when the page is closed. (Data in a localStorage object created in a "private browsing" or incognito session is cleared when the last "private" tab is closed.)
Data stored in either localStorage is specific to the protocol of the page. In particular, data stored by a script on a site accessed with HTTP is put in a different localStorage from the same site accessed with HTTPS
Syntax
myStorage = window.localStorage
Example
localStorage.setItem('myCat', 'Tom');
const cat = localStorage.getItem('myCat');
localStorage.removeItem('myCat');
localStorage.clear();