finprim
Financial primitives for TypeScript. Zero dependencies.
finprim launched on April 15, 2026. The site was not reachable when checked in September 2026.
What it does
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.
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