{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "name",
    "age"
  ],
  "properties": {
    "name": {
      "type": "string"
    },
    "age": {
      "type": "integer"
    },
    "height": {
      "type": "number"
    },
    "active": {
      "type": "boolean"
    },
    "nickname": {
      "type": [
        "string",
        "null"
      ]
    },
    "role": {
      "enum": [
        "admin",
        "user",
        "guest"
      ]
    },
    "hobbies": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "address": {
      "type": "object",
      "required": [
        "city"
      ],
      "additionalProperties": false,
      "properties": {
        "city": {
          "type": "string"
        },
        "zip": {
          "type": "integer"
        }
      }
    },
    "friends": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "name"
        ],
        "properties": {
          "name": {
            "type": "string"
          },
          "age": {
            "type": "integer"
          }
        }
      }
    },
    "tree": {
      "$ref": "#/$defs/Node"
    },
    "nullable_hobbies": {
      "type": "array",
      "items": {
        "type": [
          "string",
          "null"
        ]
      }
    },
    "nullable_scores": {
      "type": "array",
      "items": {
        "type": [
          "integer",
          "null"
        ]
      }
    }
  },
  "$defs": {
    "Node": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "value"
      ],
      "properties": {
        "value": {
          "type": "integer"
        },
        "next": {
          "$ref": "#/$defs/Node"
        },
        "children": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/Node"
          }
        }
      }
    }
  }
}