JSON правильный. Структура не имеет большого семантического значения. Я изменил структуру, чтобы она имела больше смысла и стала более управляемой при добавлении атрибутов.
{"menu": {
"items": [
{
"name":"coke",
"qty": 20,
"category":"drinks",
"sizes":["small","large"]
},
{
"name":"pepsi",
"qty": 20,
"category":"drinks",
"sizes":["small","large"]
},
{
"name":"water",
"qty": 20,
"category":"drinks",
"sizes":["small","large"]
},
{
"name":"hamburger",
"qty": 40,
"category":"junk food",
"sizes":["small","large"]
},
{
"name":"fries",
"qty": 20,
"category":"junk food",
"sizes":["small","large"]
},
{
"name":"pizza",
"qty": 20,
"category":"junk food",
"sizes":["small","large"]
}
]
}}
для экономии места вы можете сделать что-то подобное тоже
{"menu": {
"items": [
{
"name":"coke",
"qty": 20,
"category":0,
"sizes":["small","large"]
},
{
"name":"pepsi",
"qty": 20,
"category":0,
"sizes":["small","large"]
},
{
"name":"water",
"qty": 20,
"category":0,
"sizes":["small","large"]
},
{
"name":"hamburger",
"qty": 40,
"category":1,
"sizes":["small","large"]
},
{
"name":"fries",
"qty": 20,
"category":1,
"sizes":["small","large"]
},
{
"name":"pizza",
"qty": 20,
"category":1,
"sizes":["small","large"]
}
],
"categories":[
"drinks",
"junk food"
]
}}