app2_schema.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "item": {
      "type": "object",
      "properties": {
        "code": {
          "type": "integer"
        },
        "name": {
          "type": "string"
        }
      }
    },
    "price": {
      "type": "integer"
    },
    "stock_count": {
      "type": "integer"
    }
  },
  "additionalProperties": false
}