JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

var data = [{
    "name": "Afghanistan",
        "code": "AF"
}, {
    "name": "Ă…land Islands",
        "code": "AX"
}, {
    "name": "Albania",
        "code": "AL"
}, {
    "name": "Algeria",
        "code": "DZ"
}];


function getCountryByCode(code) {
  return data.filter(
      function(data){return data.code == code}
  );
}

var found = getCountryByCode('DZ');

document.getElementById('output').innerHTML=found[0].name;