swiz.js

'use strict';

var swiz = require('swiz'),
  Chain = swiz.Chain,
  Valve = swiz.Valve,
  o = swiz.struct.Obj,
  f = swiz.struct.Field;

Valve.addChainValidator('isHigh', 'description', function(value, baton, callback) {
  if(value > baton) {
    callback(null, value);
    return;
  }
  callback('value is not higher then baton');
});

var def = [o('Node', {
  fields: [
    f('low', {
      val: new Chain().isInt().range(0, Infinity)
    }),
    f('high', {
      val: new Chain().isInt().range(0, Infinity).custom('isHigh')
    })
  ]})];

var validity = swiz.defToValve(def),
  schema = validity.Node,
  v = new Valve(schema),
  payload = {
    low: 1,
    high: 10
  };

v.baton = payload.low;
v.check(payload, function(err, cleaned) {
  if(err) {
    console.log('error:', err);
    return;
  }

  console.log('cleaned:', cleaned);
});