mongoose_update_document_version_2.js

app.put('/user/:userId', (req, res) => {
  User.findByIdAndUpdate(req.params.userId, $set: req.body.data, (updateFailedError, user) => {
    if (updateFailedError) {
      res
        .status(500)
        .json({
          errors: [updateFailedError]
        });
    }
    
    res
      .status(200)
      .json({
        success: true
        data: {
          user
        }
      });
  });
});