Where is it better to store the flag - in cookies or in localstorage?

Question

JavaScript

authenticated: false
For example, the SPA application flag . Where and why is it better to store such data?
Now I have cookies. I think I can put it in storage?

Answer 1

If you have one domain - in localStorage. It makes no sense to carry this cookie between requests. If there are subdomains - in the cookie, because. you simply will not rummage around localStorage between domains in any way.
Even better - in the state of your SPA. Why do you need a cookie/storage flag to indicate that the user is authorized? Well, get it when you load your SPA and let it be stored in RAM. Moreover, you will get reactivity.