normalize null value to 0 space for object's attribute

normalizeParamsAttributesNullValue.js

var async = require('async');

function normalizeParamsAttributesNullValue (params, callback) {
  async.forEachSeries(Object.keys(params), function(k, cb) {
    if (params[k] === null) {
      params[k] = '';
    }
    cb();
  }, function() {
    callback(params);
  })
}

var params = {
  name: 'name'
  , email: null
  , uri: 'http://example.com/'
}

normalizeParamsAttributesNullValue(params, function(result) {
  console.log(result);
  // { name: 'name', email: '', uri: 'http://example.com/' }
})