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:

<!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> 

Output:

Before:

After:

Supported Browsers: The browser supported by DOM setItem() Method are listed below:

Google Chrome
Internet Explorer
Firefox
Opera
Safari

My Personal Notes

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