const stuff=[
  {
    "type": "even",
    "other": "stuffisnice"
  },
  {
    "type": "odd",
    "other": "soo nice"
  },
  {
    "type": "even",
    "other": "nice indeed"
  },
  {
    "type": "odd",
    "other": "nicey dicey"
  },
  {
    "type": "odd",
    "other": "so goood"
  }
];
const stuff=[
  {
    "id": "1",
    "title": "even",
    "items" [
        {
          "id": "01"
          "name": "item even 01"
        }, {
          "id": "02"
          "name": "item even 02"
        }
    ]
  },
  {
    "id": "2",
    "title": "odd",
    "items" [
        {
          "id": "01"
          "name": "item odd 01"
        }, {
          "id": "02"
          "name": "item odd 02"
        }
    ]
  }
];

Update stuff.js