api/sanitizer/_single_scalar_parameters.js

var _ = require('lodash'),
    check = require('check-types');

// validate inputs
function _sanitize( raw, clean ){
  // error & warning messages
  var messages = { errors: [], warnings: [] };

  Object.keys(raw).forEach(function(key) {
    if (_.isArray(raw[key])) {
      messages.errors.push('\'' + key + '\' parameter can only have one value');
      delete raw[key];
    } else if (_.isObject(raw[key])) {
      messages.errors.push('\'' + key + '\' parameter must be a scalar');
      delete raw[key];
    }

  });

  return messages;
}

// export function
module.exports = () => ({
  sanitize: _sanitize
});