Developer reference
Data Validation Cheatsheet
Phone, Luhn, IBAN, VAT, GTIN, and ISO country validation reminders for pasted data.
Phone prefix
Normalize common international phone input.
+1 415 555 0100Luhn sample
Check digit pattern for card-like identifiers.
4242 4242 4242 4242IBAN sample
Validate country prefix and checksum.
DE89370400440532013000GTIN sample
EAN/GTIN check digit example.
4006381333931