json_schema: {
      "id": "https://raw.githubusercontent.com/rolfvreijdenberger/jsend-json-schema/master/rest-fail-response-json-schema.json",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "A simple REST response schema for a payload for a non-succesful response.This schema allows you to add structured information that can be consumed by an API consumer in a standard way. HTTP status codes should indicate what went wrong.",
      "description": "",
      "type": "object",
      "required": [
          "messages"
      ],
      "properties": {
          "messages": {
              "description": "an array of message objects related to the failure",
              "type": "array",
              "minItems": 1,
              "items": {
                  "description": "an object that contains fields related to a failure",
                  "type": "object",
                  "required": [
                      "message"
                  ],
                  "properties": {
                      "message": {
                          "description": "A meaningful, end-user-readable (or at the least log-worthy) message, explaining what happened.",
                          "type": "string"
                      },
                      "field": {
                          "description": "an optional string representation that maps to input. POST keys, a query parameter, a header key etc. For complex datastructures you could use different solutions like a dot seperated tree representation, an xpath expression etc.",
                          "type": "string"
                      },
                      "code": {
                          "description": "A numeric code providing info about a failure or error in a result, if applicable",
                          "type": [
                              "string",
                              "integer"
                          ]
                      }
                  }
              }
          }
      }
  }