India GSTIN Validator
Validate India Goods and Services Tax Identification Numbers (GSTIN). Check Modulo 36 in real time.
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How GSTIN validation works
The validator checks if the input is exactly 15 characters and matches the official regex template. It verifies that the first two digits represent a valid state code, and parses the taxpayer's PAN.
It applies the alternating Modulo 36 algorithm across the first 14 characters with alternating weights [1, 2, 1, 2...] and checks if it matches the 15th digit.