curl --location --request GET 'https://demo.myshopify.com//admin/api//themes/.json'
{
"theme": {
"id": 828155753,
"name": "Comfort",
"created_at": "2023-01-03T12:21:36-05:00",
"updated_at": "2023-01-03T12:21:36-05:00",
"role": "main",
"theme_store_id": null,
"previewable": true,
"processing": false,
"admin_graphql_api_id": "gid://shopify/Theme/828155753"
}
}