If you handle Indian invoices for any business, you know the month-end ritual: thirty vendor PDFs arrive in your inbox, and someone has to type GSTIN, invoice number, taxable value, and the CGST/SGST/IGST split into a spreadsheet so the accountant can reconcile with GSTR-2A. One typo means a mismatched input tax credit, and that means a tense email at 9pm.
I built a parser that reads any GST-compliant PDF invoice and writes the numbers straight into a CSV. Sixty lines, one external dependency, no paid OCR service, no API calls.
Here's the full code, then I'll walk through why each piece exists.
The Code
import re
