{
  "type": "object",
  "properties": {
    "name": { "type": "string", "minLength": 1, "maxLength": 12 },
    "age": { "type": "integer" },
    "role": { "enum": ["admin", "editor", "viewer"] },
    "active": { "type": "boolean" }
  },
  "required": ["name", "age", "role", "active"],
  "additionalProperties": false
}