json_schema: {
      "$async": true,
      "$schema": "http://json-schema.org/draft-06/schema#",
      "description": "LoginForm from Tiamat",
      "properties": {
          "email": {
              "_format": "email",
              "emailExists": true,
              "maxLength": 30,
              "minLength": 4,
              "type": "string"
          },
          "password": {
              "maxLength": 50,
              "minLength": 4,
              "type": "string"
          }
      },
      "required": [
          "email",
          "password"
      ],
      "title": "LoginForm",
      "type": "object"
  }