gistfile1.txt

{
  "items": [
    {
      "id": "1",
      "items": [
        {
          "id": "1_1",
          "items": []
        },
        {
          "id": "1_2",
          "items": []
        },
        {
          "id": "1_3",
          "items": []
        },
        {
          "id": "1_4",
          "items": [
            {
              "id": "1_4_1",
              "items": []
            },
            {
              "id": "1_4_2",
              "items": []
            }
          ]
        },
        {
          "id": "1_5",
          "items": []
        }
      ]
    },
    {
      "id": "2",
      "items": [
        {
          "id": "2_1",
          "items": []
        },
        {
          "id": "2_2",
          "items": [
            {
              "id": "2_2_1",
              "items": []
            }
          ]
        }
      ]
    }
  ]
}