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esaramago/validateNIF.ts

Last active September 6, 2024 10:27
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Validação NIF português (typescript)
Raw
validateNIF.ts
function validateNIF(value: string) {
// has 9 digits?
if (/^[0-9]{9}$/.test(value) === false) return false
// starts with 5 (Pessoa coletiva)
if(!['1', '2', '3', '5', '6', '8'].includes(value.substring(0,1)) &&
!['45', '70', '71', '72', '77', '79', '90', '91', '98', '99'].includes(value.substring(0,2)))
return false
const total =
Number(value[0]) * 9 +
Number(value[1]) * 8 +
Number(value[2]) * 7 +
Number(value[3]) * 6 +
Number(value[4]) * 5 +
Number(value[5]) * 4 +
Number(value[6]) * 3 +
Number(value[7]) * 2
const module11 = total - Math.floor(total / 11) * 11
const comparison = module11 === 1 || module11 === 0 ? 0 : 11 - module11
return Number(value[8]) === comparison
}
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