br-validations/src/cnpj.js

A library of validations applicable to several Brazilian data like I.E., CNPJ, CPF and others

var CNPJ = {};

CNPJ.validate = function(c) {
	var b = [6,5,4,3,2,9,8,7,6,5,4,3,2];
	c = c.replace(/[^\d]/g,'');

	var r = /^(0{14}|1{14}|2{14}|3{14}|4{14}|5{14}|6{14}|7{14}|8{14}|9{14})$/;
	if (!c || c.length !== 14 || r.test(c)) {
		return false;
	}
	c = c.split('');

	for (var i = 0, n = 0; i < 12; i++) {
		n += c[i] * b[i+1];
	}
	n = 11 - n%11;
	n = n >= 10 ? 0 : n;
	if (parseInt(c[12]) !== n)  {
		return false;
	}

	for (i = 0, n = 0; i <= 12; i++) {
		n += c[i] * b[i];
	}
	n = 11 - n%11;
	n = n >= 10 ? 0 : n;
	if (parseInt(c[13]) !== n)  {
		return false;
	}
	return true;
};