What is finprim and what does it do?

Zero-dep TypeScript lib for IBAN/BIC/card/VAT validation, currency formatting, EMI calcs. Fully typed, branded results.

Does finprim work with Zod or React?

Yup — optional Zod schemas, React hooks for live validation/formatting, NestJS pipes. Core stays lean.

Handles 80+ IBAN countries, rejects unsafe inputs, precise calcs. Types prevent bugs. Stars/PRs building trust.

Midnight sprint. IBAN regex from Stack Overflow fails on German accounts. Again. Enter finprim—the zero-dep TypeScript lib torching fintech drudgery.

DevTools Feed Apr 03, 2026 3 min read

Finprim eliminates copy-paste fintech validators with zero deps and ironclad TypeScript types. 𝕏
Branded types and discriminated unions catch bugs before runtime—game-changer for payments apps. 𝕏
Saves weeks on IBAN/cards/EMIs; optional integrations for Zod/React/NestJS keep it flexible. 𝕏

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#financial validation #finprim #fintech #typescript

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Originally reported by dev.to