code: function (message, encoding) {
      return module.exports.jsonToObject(
        module.exports.decodePayload(message, encoding))
    }
docs: Converts the specified message's payload from JSON to an object and returns
  it.
  @param {external:Message} message - The DXL message.
  @param {String} [encoding=utf8] - The encoding of the payload.
  @returns {Object} The object.