Handling Mongoose validation errors – where and how?

Question

I\'m trying to decide how I want to handle validation errors in Mongoose.

Custom error messages using node-validator

I have defined my own validation rules

Answer 1

// my controller.js or whatever your route handler file is
// This Handles multiple Schema Level Validations in 1 line

// user object created from model
let user = new Users({
firstName: req.body.firstName,
lastName: req.body.lastName 
...

});

  // Since the Error response are in ::, ... 
  var err = user.validateSync();
  if (err && err.message) return res.send(err.message.split(':')[2].split(',')[0]);