convertCurrency.js

function convert(from, to){
  return fetch('https://www.google.com/finance/converter?a=1&from='+from+'&to='+to+'&meta=ei%3D0EUBWPCoAsermAG0oaiAAQ').then(res => res.text()).then(value => {
     var doc = (new DOMParser()).parseFromString(value, "text/html");;
     return +doc.querySelector('.bld').innerHTML.split(' ')[0]
  });
}

/** 

  usage : 

  convert('USD', 'COP')
  .then(value => {
      console.log(value);
  });
  
**/