Simple Google Sheets API for JS

sheets-api.js

function Sheet(key){
  this.key = key;
  this.baseurl = "https://spreadsheets.google.com/pub?key="+this.key+"&hl=en&output=tsv";
}

Sheet.prototype.fetchAsync = function(pageId, callback){
  var xmlHttp = new XMLHttpRequest();
   xmlHttp.onreadystatechange = function() {
       if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
           callback(_getSheetData(xmlHttp.responseText));
   }
   xmlHttp.open("GET", this.baseurl + "&gid=" + pageId, true);
   xmlHttp.send(null);
}

function _getSheetData(responseText){
  return responseText.split('\n').map(function(row){
    return row.split('\t');
  });
}