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garrefa/validateCNPJ.js

Created February 20, 2017 15:07
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  1. garrefa created this gist Feb 20, 2017.
    38 changes: 38 additions & 0 deletions validateCNPJ.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,38 @@
    function validateCNPJ(cnpj) {
    cnpj = cnpj.replace(/[^\d]+/g,'');
    if (cnpj.length != 14) return false;
    // Remove known invalid CNPJs
    if (cnpj === "00000000000000" ||
    cnpj === "11111111111111" ||
    cnpj === "22222222222222" ||
    cnpj === "33333333333333" ||
    cnpj === "44444444444444" ||
    cnpj === "55555555555555" ||
    cnpj === "66666666666666" ||
    cnpj === "77777777777777" ||
    cnpj === "88888888888888" ||
    cnpj === "99999999999999") return false;
    // Validate Blocks
    const blocksDivision = cnpj.length - 2
    const headBlock = cnpj.substring(0,blocksDivision);
    const tailBlock = cnpj.substring(blocksDivision);
    let sum = 0;
    let pos = blocksDivision - 7;
    for (i = blocksDivision; i >= 1; i--) {
    sum += headBlock.charAt(blocksDivision - i) * pos--;
    if (pos < 2) pos = 9;
    }
    let validationCheck = sum % 11 < 2 ? 0 : 11 - sum % 11;
    if (validationCheck != tailBlock.charAt(0)) return false;
    blocksDivision = blocksDivision + 1;
    headBlock = cnpj.substring(0,blocksDivision);
    sum = 0;
    pos = blocksDivision - 7;
    for (i = blocksDivision; i >= 1; i--) {
    sum += headBlock.charAt(blocksDivision - i) * pos--;
    if (pos < 2) pos = 9;
    }
    validationCheck = sum % 11 < 2 ? 0 : 11 - sum % 11;
    if (validationCheck != tailBlock.charAt(1)) return false;
    return true;
    }