finprim

finprim とは？

Every fintech team writes the same validators from scratch — IBAN checks, card formatters, currency helpers. finprim is the open source version of what your team has already built three times. One zero-dependency TypeScript library: IBAN (80+ countries), card (Luhn + network detection), BIC/SWIFT, sort codes, EU VAT, US routing numbers, loan/EMI calculations, and multi-locale currency formatting. With branded types, Zod schemas, React hooks, and NestJS pipes.