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Validate a GTIN barcode number — EAN-8, UPC-A (12), EAN-13 or GTIN-14 — by the standard mod-10 check digit. Length selects the scheme.
https://checkdigit.openverbs.com/v1/eanValidate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored.
https://checkdigit.openverbs.com/v1/imeiValidate an ISBN-10 (mod-11, trailing X allowed) or ISBN-13 (GTIN mod-10) book number. Length after removing spaces/hyphens selects the scheme.
https://checkdigit.openverbs.com/v1/isbnValidate a number by the Luhn (mod-10) algorithm — the scheme behind credit/debit card numbers and many IDs. Spaces and hyphens are ignored. A mismatched check digit is a successful { valid: false }.
https://checkdigit.openverbs.com/v1/luhnValidate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.
https://checkdigit.openverbs.com/v1/routing