Check if a key exists in HTML5 local storage

#getitem(key) Gets the value of a parameter and returns the value associated with the key. The given key exists in the list associated with this object.

if(localStorage.getItem("user")===null) {
   //...
}

But if the key does not exist in the list then it passes null value using the code given below

You can also follow the procedure given below -

if("user" in localStorage){
   alert('yes');
} else {
   alert('no');
}

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