We build different GDPR tools to help out the system administrator. In many associations, multiple projects have the same requirements regarding access rights. Our view permission feature prevent having to look up permissions individually for every project or user across the entire JIRA instance. Once a user has view access permission to a project, you will see it in this tool.
There are several ways to verify if someone has a certain permission. But the easiest and fastest one is to use the View Permission tool, if you want to know if a user have access to a project, for this.
Select a user for showing individually permissions
Select a project to see which users have view permissions in this specific project.