{
    "images": [
        {
            "file_name": "000000123456.jpg",
            "height": 1024,
            "width": 1024,
            "id": 123456
        }
    ],
    "annotations": [
        {
            "area": 23045,
            "bbox": [100, 200, 300, 400],  // [x_min, y_min, width, height]
            "category_id": 18,
            "id": 678910,
            "image_id": 123456,
            "iscrowd": 0,
            "segmentation": []
        }
    ],
    "categories": [
        {
            "id": 18,
            "name": "dog",
            "supercategory": "animal"
        }
    ]
}