{ "id": "playlist-789012", "name": "Morning Run", "description": "High-energy tracks for early-morning runs.", "visibility": "public", "userId": "500123", "trackCount": 24, "tracks": [ null, null ], "createdAt": "2026-05-28T14:30:00Z", "modifiedAt": "2026-05-28T15:00:00Z" }