• In HTML5, web storage is one of the great features. In Web storage, web applications can locally store data within the browser on the client side.
  • It is sometimes known as DOM storage and stores data in the form of key/value pair on the browser.
  • Web storage is better and faster than cookies storage, and storing data is similar to cookies.
  • Similarly, Web Storage can use storage space of up to 5MB per domain.
  • It is faster than cookies storage because It will not send data to the server side.
  • At web storage cookies data expires after some time or session but data stored by local Storage never expires.
  • There are two types of web storage, they are;
    • Local Storage
    • Session Storage
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Local Storage

  • In this the local Storage object stores data locally within the browser.
  • The data stored by local Storage object does not have any expiration date.
  • The stored data will not be deleted if the browser is reopened or closed.
  • The key/values are always stored as String, and can be accessed with localStorage.setItem() and localStorage.getItem() methods.

Sample Code

<!DOCTYPE html>
<html>
<head>
  <title>Web Storage API</title>
  <style>
    body{
      color: blue;
      text-align: center;
      font-size: 30px;
      margin-top: 30px;
      font-style: italic;
    }
  </style>
</head>
<body>
<script>
 if(typeof(Storage)!=="undefined") {
  localStorage.setItem("name","Venkat");
  localStorage.setItem("Country", "India");
   document.write("Hi this is"+" "+localStorage.name+" "+"from" +" "+ localStorage.Country);
}
 else{
  alert("Sorry! your browser is not supporting the browser")
 }
</script>
</body>
</html>

Output

Session Storage

  • The session storage is same as local storage, but session storage stores data only for one session.
  • If you close the browser, then data will be deleted or lost.

Sample Code

<!DOCTYPE html>
<html>
<head>
<script>
function clickCounter() {
  if (typeof(Storage) !== "undefined") {
    if (sessionStorage.clickcount) {
      sessionStorage.clickcount = Number(sessionStorage.clickcount)+1;
    } else {
      sessionStorage.clickcount = 1;
    }
    document.getElementById("result").innerHTML = "You have clicked the button " + sessionStorage.clickcount + " time(s) in this session.";
  } else {
    document.getElementById("result").innerHTML = "Sorry, your browser does not support web storage...";
  }
}
</script>
</head>
<body>

<p><button onclick="clickCounter()" type="button">Click me!</button></p>
<div id="result"></div>
<p>Click the button to see the counter increase.</p>
<p>Close the browser tab (or window), and try again, and the counter is reset.</p>

</body>
</html>

Output

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