virtueschema.js

  var purity = require('virtue-purity');  //virtue's validation
                                          //& sanitization lib.

    var user = {

      name : [ purity.isString ], //Simple validation that the
                                  //name is a string.

      email : [ purity.trim, purity.isString, purity.isEmail ],

      age : [ purity.isNumber, purity.greater(0), purity.toInt ],

      //Array of pets
      pets :  [{
                nickname: [purity.isString]
              }],

      comments : [], //Free-form field, anything can go in there.
    }