import { ManagementClient } from "auth0";

async function main() {
    const client = new ManagementClient({
        token: "<token>",
    });
    await client.userGrants.list({
        perPage: 1,
        page: 1,
        includeTotals: true,
        userId: "user_id",
        clientId: "client_id",
        audience: "audience",
    });
}
main();

[
  {
    "id": "<string>",
    "clientID": "<string>",
    "user_id": "<string>",
    "audience": "<string>",
    "scope": [
      "<string>"
    ]
  }
]