I have 2 web apps one is developed in angular5(is the standard ui in my site) and other in VueJS2(is the admin ui), both are subdomains of the same domain (site.com, admin.site.com), what I need is to share the user authentication data between them, this information currently I store in the browser using LocalStorage.
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The accepted solution should work but its mostly a workaround. It doesn't work like LocalStorage does, it's not so flexible.