{"category": "Sporting Goods",  "price": "$49.99",    "stocked": true,    "name": "Football"},
{"category": "Sporting Goods",  "price": "$9.99",     "stocked": true,    "name": "Baseball"},
{"category": "Sporting Goods",  "price": "$29.99",    "stocked": false,   "name": "Basketball"},
{"category": "Electronics",     "price": "$99.99",    "stocked": true,    "name": "iPod Touch"},
{"category": "Electronics",     "price": "$399.99",   "stocked": false,   "name": "iPhone X"},
{"category": "Electronics",     "price": "$199.99",   "stocked": true,    "name": "iPad Mini"},
{"category": "Sporting Goods",  "price": "$199.99",   "stocked": true,    "name": "Tennis Balls"},
{"category": "Electronics",     "price": "$199.99",   "stocked": true,    "name": "Huawei P10"}

Modificación del Json con forEach, reduce y lodash (groupBy()).