The getitem(key) takes value for one parameter and returns the value associated with the key. The given key is present in the list associated with the object.
if(localStorage.getItem("user")===null) { //... }
But if the key is not present in the list then it passes null value by using the below-given code
You can also follow the below-given procedure −
if("user" in localStorage){ alert('yes'); } else { alert('no'); }