json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "User",
      "description": "Chat user JSON schema",
      "type": "object",
      "properties": {
          "name": {
              "type": "string",
              "minLength": 3,
              "maxLength": 12
          },
          "avatar": {
              "type": "string",
              "format": "uri"
          },
          "role": {
              "type": "string"
          },
          "isConnected": {
              "type": "boolean"
          }
      }
  }