Leszek Czajka

Leszek Czajka

Full-stack developer & SaaS founder
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Maker History

  • IsValid
    IsValidValidate 70+ data formats with one REST API
    Apr 2026
    • 🎉
    Joined Product HuntApril 9th, 2026

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Leszek Czajka•

2mo ago

IsValid - Validate 70+ data formats with one REST API

A powerful REST API for validating emails, IBANs, BIC/SWIFT codes, LEI, ISIN, credit cards, VAT numbers, phone numbers, and 70+ more validators. Free tier available.
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