validation.js

var validation  = require( './validation' );
var v = require('./validators' );

function lowerCase( value, err ){
  return value.toLowerCase();
}

var userSchema = {
  firstname : [ v.trim() ],
  lastname  : [ v.trim() ],

  personal  : {
    email     : [ v.trim(), v.isEmail(), lowerCase ],
    age       : [ v.toInt(), v.min(0) ]  
  }
  
};

var fakeUser = {
  firstname : 'Olivier',
  lastname: 'Vaillancourt',
  personal: {
    email: 'Olivier@keatonrow.com   ',
    age: 5.5    
  }
};

validation.validate( fakeUser, userSchema );