flat-tree.json

{
  "id1": {
    "name": "Category_1",
    "type": "CATEGORY",
    "isRoot": true,
    "children": [
      "id2",
      "id3"
    ]
  },
  "id2": {
    "name": "Todo 1",
    "type": "TODO",
    "isComplete": false
  },
  "id3": {
    "name": "Category_2",
    "type": "CATEGORY",
    "isRoot": false,
    "children": [
      "id4"
    ]
  },
  "id4": {
    "name": "Todo 2",
    "type": "TODO",
    "isComplete": false
  }
}