Validate CPF (BR GOVERNMENT UNIQUE ID)

validateCPF.js

// source: https://www.devmedia.com.br/validar-cpf-com-javascript/23916
function TestaCPF(strCPF) {
    var Soma;
    var Resto;
    Soma = 0;
  if (strCPF == "00000000000") return false;

  for (i=1; i<=9; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (11 - i);
  Resto = (Soma * 10) % 11;

    if ((Resto == 10) || (Resto == 11))  Resto = 0;
    if (Resto != parseInt(strCPF.substring(9, 10)) ) return false;

  Soma = 0;
    for (i = 1; i <= 10; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (12 - i);
    Resto = (Soma * 10) % 11;

    if ((Resto == 10) || (Resto == 11))  Resto = 0;
    if (Resto != parseInt(strCPF.substring(10, 11) ) ) return false;
    return true;
}

var strCPF = "12345678909";
alert(TestaCPF(strCPF));// false = invalid CPF

var strCPF2 = "56801154095";
// if you need more CPFs: https://www.4devs.com.br/gerador_de_cpf
alert(TestaCPF(strCPF2));// true = valid CPF