A little utility to generate fake vat code and also to check if they are valid
yarn add italian-vat-better
and then
import { fakeVat, verifyVat } from 'italian-vat-better'
fakeVat() // A random valid vat code
or
fakeVat('1111111111') // 11111111115
verifyVat('09171640965') // true
verifyVat('11111111111') // false