BTW-nummers formatted exactly as Netherlands's tax authority issues them, so they pass field-level format validation in your app. Synthetic — not registered to anyone.
NL208518437B28| Browser | sampuli.site — pick Netherlands, generate, export CSV/JSON |
| REST API | curl https://sampuli.site/api/v1/nl/tax?n=25 |
| npm | npx @sampuli/data nl.tax |
| Node | import { generate } from '@sampuli/data'; generate('nl.tax') |