Storage key() Method

Get the name of the first local storage item:

var x = localStorage.key(0);

Description

The key() method returns name of the key with the specified index.

The key() method belongs to the Storage Object, which can be either a localStorage object or a sessionStorrage object.

Method
key()	4	8	3.5	4	10.5

localStorage.key(index)

Or:

sessionStorage.key(index)

Parameter	Description
index	Required. A Number representing the index of the key you want to get the name of

DOM Version:	Web Storage API
Return Value:	A String, representing the name of the specified key

The same example, but using session storage instead of local storage.

Get the name of the first storage item:

var x = sessionStorage.key(0);

Loop through each local storage item and display the names:

for (i = 0; i < localStorage.length; i++) {
x = localStorage.key(i);
document.getElementById("demo").innerHTML += x;
}

StorageEvent reference: The key Property