HTML | DOM Storage setItem() Method

The setItem() method is used to set the storage object item which is specified by the user. This storage object can be a localStorage object or sessionStorage object.

Syntax: For local storage:

localStorage.setItem(keyname, value)

For session storage:

sessionStorage.setItem(keyname, value)

Parameters: Two parameters are required :-

Keyname: It specifies the name of the key used for getting the value.
value: It specifies the value which replaces the old value.

Return Value: A String, representing the inserted value.

Example:

html

<!DOCTYPE html>
<html>
 
<head>
    <!--script for creating new local
      storage item and retrieve it -->
    <script>
       
        // Set item in local storage.
        function createItem() {
            localStorage.setItem("city", "Gwalior");
        }
 
        function myFunction() {
            var x = localStorage.getItem("city");
            document.getElementById("demo").innerHTML = x;
        }
    </script>
</head>
 
<body>
    <h1>Welcome to GeeksforGeeks</h1>
    <h3>The Storage setItem() Method</h3>
    <p>Click on button to create a
      local storage item </p>
 
    <button onclick="createItem()">
      Create local storage item
  </button>
 
    <p>Click the button to get the item value:</p>
 
    <button onclick="myFunction()">
      Get the item value
  </button>
 
    <p id="demo"></p>
 
</body>
 
</html>