Confluence users can be exported to JSON format. You can read more about JSON here.
A Confluence user is as exported as JSON like below. The canUse property reflects the global Confluence permission Can use.
[
{
"username": "tester",
"active": true,
"fullName": "tester",
"email": "tester@mail.com",
"directoryName": "Confluence Internal Directory",
"createdDate": "2019-09-03 22:50",
"updatedDate": "2019-09-19 09:20",
"groups": [
"testing-space5",
"confluence-users",
"testing-space"
],
"preferredLanguage": "Default",
"canUse": true
}
]