let user = 'limepotato';
let url = 'https://lastfm-last-played.biancarosa.com.br/' + user + '/latest-song';
let song = document.querySelector('#song');
fetch(url)
    .then(function (response) {
        return response.json()
    }).then(function (json) {
        song.innerHTML = json['track']['name'] + ' - ' + json['track']['artist']['#text'];
    });