categories.json

[ {"id": 1, "name": "First class"}, {"id": 2, "name": "Second class"} ]

products.json

[
  {"id": 1, "name": "Potato", "category_id": 1},
  {"id": 2, "name": "Tomato", "category_id": 1},
  {"id": 3, "name": "Carrot", "category_id": 2}
]

skus.json

[
  {"id": 1, "product_id": 1, "name": "sku 1"},
  {"id": 2, "product_id": 1, "name": "sku 2"},
  {"id": 3, "product_id": 2, "name": "sku 3"},
  {"id": 4, "product_id": 2, "name": "sku 4"},
  {"id": 5, "product_id": 2, "name": "sku 5"},
  {"id": 6, "product_id": 3, "name": "sku 6"},
  {"id": 7, "product_id": 3, "name": "sku 7"},
  {"id": 8, "product_id": 3, "name": "sku 8"}
]