Hey Product Hunt 👋 I built DataMockSeed because generating realistic-but-fake test data (Spanish IDs, IBANs, credit cards) with correct checksums was always a pain. LLMs get check digits wrong, and general fakers like Faker.js don't cover Spanish DNI/NIE/CIF/NSS formats. What it does: • Everything it generates passes its validator: DNI/NIE/CIF, IBAN (ES/DE/FR/PT), test credit cards (Luhn), phone numbers • Seed-based: same seed = same data, so it works well in CI and E2E tests • Runs 100% in your browser: nothing is sent to a server • Free, no signup, installable as a PWA • REST API and schema playground for bulk data All data is fictitious. It never uses real people or real cards. I'd love your feedback, especially on which data types or countries to add next. Thanks for checking it out!

datamockseed.firstflip.es

Fake test data with real checksums — DNI, IBAN, cards

Fake test data with real checksums — DNI, IBAN, cards