xml.js

fetch('https://www.tokopedia.com/blog/search/keuangan/feed/rss2/').then(a => a.text()).then(txt => {
    let parser = new DOMParser();
    let res = parser.parseFromString(txt, 'text/xml');
    let arr = [];
    let doc = res.getElementsByTagName('item');
    let fields = ['title', 'description', 'link', 'pubDate'];
    for (let i=0;i<doc.length;i++) {
      let obj = {};
      let cats = [];
      let catDoc = doc[i].getElementsByTagName('category');
      for (let j = 0; j < catDoc.length; j++) {
      	cats.push(catDoc[j].textContent);
      }
      obj.cats = cats;
      fields.map(f => {
        let val = doc[i].getElementsByTagName(f)[0].textContent;
        obj[f] = val;
      });
      arr.push(obj);
    }
    console.log(arr);
});