How is HTML5 localStorage Data Isolated?

Per-Domain Isolation of HTML5 localStorage

In HTML5, the localStorage object plays a crucial role in providing persistent data storage within web applications. However, understanding the scope and isolation of localStorage data is essential to ensure secure and effective data management.

Isolation per Page/Domain

The HTML5 localStorage object is not isolated per page but rather per domain:

• The data stored in the localStorage object is accessible across all pages with the same domain and port.
• Different domains (even if located on the same web server) have separate localStorage instances.

Key Nomenclature

Given the per-domain isolation of localStorage, it is recommended to use prefixes for localStorage key names. This helps in distinguishing and organizing keys from different sources and avoids potential conflicts.

Flexibility in Key Naming

While prefixes are recommended, you are not required to use them. The localStorage key names can be freely chosen to suit your application's needs. However, it is generally advisable to follow a consistent naming convention to maintain readability and organization.

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