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Task History

Get task history

Section titled “ Get task history ”
GET v3/projects/23423233/todolists/13964085/tasks/13966758/history returns the activity history for the specified task. 
[
  {
    "id": 88574412,
    "action": "created",
    "created_at": "2016-12-27T12:08:57+00:00",
    "creator": {
      "id": 12009183
    }
  },
  {
    "id": 88574413,
    "action": "updated",
    "created_at": "2016-12-27T13:10:21+00:00",
    "creator": {
      "id": 11679192
    }
  },
  {
    "id": 88574414,
    "action": "completed",
    "created_at": "2016-12-28T09:15:34+00:00",
    "creator": {
      "id": 12009183
    }
  }
]

History entries include task creation, updates, assignments, comments, status changes, and completion events.

Get task history detail

Section titled “ Get task history detail ”
GET v3/projects/23423233/todolists/13964085/tasks/13966758/history/88574413 returns detailed information for a specific history entry. 
{
  "id": 88574413,
  "action": "updated",
  "created_at": "2016-12-27T13:10:21+00:00",
  "creator": {
    "id": 11679192
  },
  "changes": {
    "due_date": {
      "old": "2016-12-30",
      "new": "2017-01-05"
    }
  }
}

History details may contain additional information about what changed, including assignments, dates, status updates, labels, comments, and custom field modifications.