express-stormpath-s3 file upload

server.js

app.get('/', stormpath.loginRequired, (req, res, next) => {
  req.user.uploadFile('./some-file.txt', err => {
    if (err) return next(err);

    req.user.getCustomData((err, data) => {
      if (err) return next(err);

      res.send('file uploaded as ' + data.s3['package.json'].href);
    });
  });
});