Getting list of users/groups that have access to a SharePoint site?

[Rudy 1]

I've been using the following URI:

_api/Web/SiteUsers

This gets a list of members. From this data, how can I determine the site owner and the level of rights for each of the members? Or will this require a different URI?

[rnbergren]

you have to look at security. That is in /_layouts/15/user.aspx or depending upon your version of SharePoint under site settings || site permissions.

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