The barcode registry
The scheme registry.
One row per scheme: the grammar, the check digit, the canonical form, the symbologies it rides, the enrichment sources and the join into the event record. GS1 is the largest family here, not the boundary.
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GTIN
Four lengths, one 14-digit identity; GS1 mod-10; symbology bindings; license-clean enrichment rails.
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GS1 Application Identifiers
Fixed vs variable termination, GS separators, AIM symbology prologues, date and decimal AI semantics — a pinned table, not folklore.
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GS1 Digital Link
The URI grammar from the path down, canonical and compressed forms, and the conformant resolver semantics behind it.
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GLN
Thirteen digits naming a party or a location, one mod-10 rail, and the three-layer join — EDI N1 loops, EPCIS party lists, Peppol endpoints.
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SSCC
Eighteen digits naming one logistic unit, the mod-10 rail, AI (00), and the custody join into AggregationEvents.
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VIN
Seventeen characters, the fully published check-digit rail (ISO 3779 / 49 CFR 565.15), and public-domain decode rails.
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ISBN
ISBN-13 as a GTIN-13, the ISBN-10 mod-11 rail and 10→13 conversion, and the license posture on book enrichment.
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UDI
One FDA regime, three issuing agencies' grammars (GS1, HIBCC, ICCBBA), the DI/PI split, and CC0 enrichment with GMDN stripped.
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NDC
Three 10-digit layouts, the 11-digit billing canonicalization, "check": "none", and the GTIN embedding behind the "3" prefix.
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Tracking numbers
USPS IMpb with its published Pub 199 MOD10 rail, UPS 1Z as consensus parse with a typed best-effort label, FedEx as parse-and-say-so.
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DL/ID (AAMVA PDF417)
The PDF417 license barcode parsed and verified locally, with hard policy flags — no_retention, enrich refused — as registry data.
Get an API key.
The local verbs run from npx barcoding.dev today with no key. A key opens the network half of the verb set.