Edit in JSFiddle

var config = {
  bucket: {
    slug: 'my-news-feed'
  }
}
Cosmic.getObjects(config, function(error, response) {
  var news = response.objects.type.news;
  var news_feed = ''
  news.forEach(function(article) {
    news_feed += '<div><h4>' + article.title + '<h4></div>'
  })
  document.getElementById('news-feed').innerHTML = news_feed;
})

<div id="news-feed"></div>