const querystring = require('querystring');
const url = require('url');

let list = [

   {

      "count": 100,
      "feed_url": "https://www.changedetection.com/accountfeed.xml?feedid=438821327538204"
    }

  ];


let newArray = list.map((item) => {
  let u = url.parse(item.feed_url);
  let newUrl = item.feed_url;
  if (u.host !== '') {
    newUrl = `http://52.211.105.9:6566/${querystring.escape(item.feed_url)}`;
  }
  return newUrl

});

console.log('New array', newArray.length);
let unique = [];

for (let item of newArray) {
  if (unique.indexOf(item) === -1) {
    unique.push(item);
  }
}
console.log('unique', unique.length);

unique = unique.map((item) => {
  return {'count':100, 'feed_url':item};
})
console.log(JSON.stringify(unique));