Created
February 20, 2017 15:07
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| 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; | |
| } |
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