{
  "definitions": {
    "pet": {
      "type": "object",
      "properties": {
        "name":  { "type": "string" },
        "breed": { "type": "string" },
        "age":  { "type": "string" }
      },
      "required": ["name", "breed", "age"]
    }
  },
  "type": "object",
  "properties": {
    "cat": { "$ref": "#/definitions/pet" },
    "dog": { "$ref": "#/definitions/pet" }
  }
}

let json = LazyJson.create("/test/specs/definitions/pets.json"); // argument can also be a json object itself

json.properties.cat.required
> ["name", "breed", "age"]

json.properties.dog.type
> "object"