How to return a value from an HTTPS request in Node.js?

I have a for loop within an https request -

for (var i = 0; i < folder.length; i++) {
      var taskCount = taskGetter(folder[i].id);
      folders[i] = {"title":folder[i].title, "id":folder[i].id, "taskCount":taskCount};
    }

    printFolderInfo(folder);

var taskCount calls the method taskGetter() which returns a value and populates folders[i] and the method printFolderInfo() writes them to a json file -

var taskGetter = function(id) {
  var taskCount = 0;
  options.path = '/api/v3/folders/' + id +'/tasks';
  var req = https.request(options, function(res) {
    var body = [];
    res.on('data', function(data) {
      body.push(data);
    })
    .on('end', function() {
      body = Buffer.concat(body);
      var task = JSON.parse(body.toString()).data; 
      taskCount = task.length;
      return taskCount;
    })
  });
  req.end();
}

The problem is that taskCount keeps returning undefined. When I do console.log(taskCount) inside taskGetter() though, it prints out the values fine. It seems like the for loop is moving on to folders[i] before taskCount gets the value from taskGetter().

Is there something that I'm doing wrong here? Any input is appreciated!

via Anish Sana