Each array entry of the claim value is a scope-token, as defined in Section 3.3 of OAuth 2.0 RFC 6749.
The following example illustrates the "scp" claim within a JWT Claims Set with four scope-tokens.
{
"aud":"https://consumer.example.com",
"iss":"https://issuer.example.com",
"exp":1443904177,
"nbf":1443904077,
"sub":"dgaf4mvfs75Fci_FL3heQA",
"scp":["email","address","profile","phone"]
}