qmk-firmware/keyboards/jj4x4/info.json

{
    "keyboard_name": "JJ4x4",
    "url": "",
    "maintainer": "qmk",
    "width": 4,
    "height": 4,
    "layouts": {
        "LAYOUT_ortho_4x4": {
            "key_count": 16,
            "layout": [
                {"x":0, "y":0},
                {"x":1, "y":0},
                {"x":2, "y":0},
                {"x":3, "y":0},
                {"x":0, "y":1},
                {"x":1, "y":1},
                {"x":2, "y":1},
                {"x":3, "y":1},
                {"x":0, "y":2},
                {"x":1, "y":2},
                {"x":2, "y":2},
                {"x":3, "y":2},
                {"x":0, "y":3},
                {"x":1, "y":3},
                {"x":2, "y":3},
                {"x":3, "y":3}
            ]
        }
    }
}