Go CNPJ #

A Go module to validate CNPJ numbers (Brazilian companies' unique identifier for the Federal Revenue).

package main

import "tangled.org/cuducos.me/go-cnpj"


func main() {
	// these return true
	cnpj.IsValid("11222333000181")
	cnpj.IsValid("11.222.333/0001-81")
	cnpj.IsValid("12.ABC.345/01DE-35")
	cnpj.IsValid("12ABC34501DE35")

	// these return false
	cnpj.IsValid("11.111.111/1111-11")
	cnpj.IsValid("12.345.678 9012-34")
	cnpj.IsValid("AB.CDE.FGH/IJKL-MN")
	cnpj.IsValid("123")

	// these return 11111111111111 and 12ABC34501DE35
	cnpj.Unmask("11.111.111/1111-11")
	cnpj.Unmask("12.ABC.345/01DE-35")

	// these return 11.111.111/1111-11 and 12.ABC.345/01DE-35
	cnpj.Mask("11111111111111")
	cnpj.Mask("12ABC34501DE35")
}

Based on Go CPF ❤️