# GSTIN checker

> Check that a GSTIN is well formed: its check character, state code and the PAN inside it.

A GSTIN is 15 characters: a two-digit state code, the holder's PAN, an entity number, the letter Z and a check character worked out from the rest. A typing mistake almost always breaks the check character.

This checks the number's structure only. Whether it is registered and active is shown on the GST portal's taxpayer search.

Developers: this page runs on GET /v1/validate/gstin/{value}. Documentation: https://api.dharun.dev/docs/validate.md