XML parsing and filtering

get-xml.js

var request = require('request');
var async = require('async');
var xml2js = require('xml2js');
var parseString = require('xml2js').parseString;

var parser = new xml2js.Parser(
{
        preserveChildrenOrder: true,
        explicitArray: false,
        charkey: "content",
        attrkey: "props",
        childkey: "content",
        emptyTag: {}
    }
);


var _ = require('lodash');

var url = "https://kwerfeldein.de/feed/";

var isCategory = function(mixed, searchTerm){
  if(mixed.constructor == Array){
    if(mixed.indexOf(searchTerm) != -1){
      return true;
    }
    else {
      return false;
    }
  }
  else {
    if (mixed == searchTerm){
      return true;
    }
    else {
      return false;
    }
  }
}


request(url, function (error, response, body) {

    parser.parseString(body, function(err, result){
//      console.log(result.rss.channel);
      async.each(result.rss.channel.item, function(entry, callback){
        //console.log(entry.title, entry.category);
        if(isCategory(entry.category, 'Ausblick') || isCategory(entry.category, 'ausblick')){
          console.log(entry.title, entry.link);
          callback(null);
        }
        else {
          callback(null);
        }
      }, function(err, result){
      });
  });
});

package.json

{
  "name": "rss",
  "version": "1.0.0",
  "description": "",
  "main": "get-xml.js",
  "dependencies": {
    "async": "^1.5.0",
    "lodash": "^3.10.1",
    "request": "^2.65.0",
    "xml2js": "^0.4.15"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}