Is HTML5 localStorage Isolated by Page/Domain? - JavaScript FAQ

├Źndice
  1. Understanding HTML5 localStorage Isolation
  2. How to Use HTML5 localStorage
  3. Conclusion

Understanding HTML5 localStorage Isolation

Yes, HTML5 localStorage is isolated by both page and domain. This means that the data stored in localStorage is only accessible within the same page that created it and by scripts from the same domain.

LocalStorage is a client-side storage mechanism that allows web applications to store key-value pairs. This data is saved in the user's browser and can be accessed even after the user closes the browser or navigates away from the website.

The isolation of localStorage by page and domain is a security feature that prevents malicious scripts from accessing data stored by other websites or pages. This feature ensures that only scripts from the same domain and page can access the stored data.

How to Use HTML5 localStorage

To use localStorage in your web application, you can use the localStorage object in JavaScript. Here's an example:


// Store data in localStorage
localStorage.setItem('username', 'john');

// Retrieve data from localStorage
var username = localStorage.getItem('username');

In this example, we're storing the value "john" under the key "username" in localStorage. We can retrieve this value later using the getItem() method.

Conclusion

In summary, HTML5 localStorage is isolated by both page and domain. This feature ensures that only scripts from the same domain and page can access the stored data, providing an extra layer of security for web applications. By using the localStorage object in JavaScript, you can easily store and retrieve data in your web application.

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