npm install node-extjs

require("node-extjs-core");

console.log(Ext.getVersion().version);

require("node-extjs");

console.log(Ext.getVersion().version);

Ext.define("User", {
    extend: 'Ext.data.Model',

	fields: [
		{name: 'name',     type: 'string'},
		{name: 'age',      type: 'int'},
		{name: 'phone',    type: 'string'},
		{name: 'gender',   type: 'string'},
		{name: 'username', type: 'string'},
		{name: 'alive',    type: 'boolean', defaultValue: true}
	],

	validations: [
		{type: 'presence',  field: 'age'},
		{type: 'length',    field: 'name',     min: 2},
		{type: 'inclusion', field: 'gender',   list: ['Male', 'Female']},
		{type: 'exclusion', field: 'username', list: ['Admin', 'Operator']},
		{type: 'format',    field: 'username', matcher: /([a-z]+)[0-9]{2,3}/}
	],
	
	changeName: function() {
		var oldName = this.get('name'),
			newName = oldName + " The Barbarian";

		this.set('name', newName);
	}
});

var user = Ext.create("User", {
	name : 'Conan',
	age  : 24,
	phone: '555-555-5555'
});

user.changeName();

console.log(user.get('name')); //returns "Conan The Barbarian"

var errors = user.validate();

console.log(errors);