How can I share localStorage data across subdomains?

Sharing localStorage Across Subdomains

In efforts to eliminate cookies in favor of localStorage for compatible browsers, a common obstacle arises when subdomains, such as www.example.com and site.example.com, maintain independent localStorage instances. This disparity results in users losing access to their personalized data when transitioning between the main domain and its subdomains.

To overcome this issue and enable a shared localStorage experience, a solution involves utilizing an iframe from the parent domain (e.g., parent.example). On each subdomain (e.g., child.example), postMessage is employed to send data to the parent.example iframe. This approach establishes a communication protocol that allows subdomains to interact with the main domain's localStorage.

Through this mechanism, subdomains effectively share the same localStorage as the parent domain, ensuring seamless data availability and a consistent user experience across all domains.

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