localStorage

LocalStorage

Here is a detail article of mozilla on it.

Vanilla JS (standard js)

localstorage.setItem("key", JSON.stringify({firstName: "Pierre", lastName: "Besson"})); //Save the object in the localStorage.
localstorage.getItem("key") // return 
//In order to have the real object

JSON.parse(localstorage.getItem("key")); //Return {firstName: "Pierre", lastName: "Besson"}