STATION 04 · TEST DATA ONLY

Test ID generator

Identifiers for fixtures that survive your own validators: UUID v4s, order numbers carrying a correct Luhn check digit, and EAN-13 codes in the 2xx internal-use block — the range GS1 reserves for in-house use, so a test barcode can never collide with a real product.

Kind Count (free bench: up to 200) Seed Prefix (order numbers only) Nothing generated yet.

Close the loop

Take any ID from this station to Station 03 and watch it pass — that round trip is the product. Seeded generation means a fixture file committed today regenerates identically next quarter; if you need one-off randomness instead, change the seed per run.