finprim provides essential financial primitives for modern TypeScript applications, offering a straightforward library that supports various financial operations such as IBAN, card, BIC, VAT, routing number validations, and loan calculations—all without external dependencies.

Core Features

• Unified Validators: Simplify your application by using one library to validate IBANs (for over 80 countries), BIC/SWIFT, UK sort codes, card numbers, EU VAT numbers, and US routing numbers.
• Loan Calculations: Make loan management easier with EMI calculations and comprehensive amortization schedules.
• Flexible Formatting: Easily display IBANs, sort codes, account numbers, and formatted currency for multiple locales.
• Type Safety: Utilize branded TypeScript types to ensure data integrity, preventing invalid data from passing through your application.
• Framework Integrations: Optionally integrate with Zod schemas, React hooks, and NestJS pipes, enhancing your existing technology stack without extra configuration.
• Production-Ready: Built with security and performance in mind, including input length guards and type checking, while adhering to zero runtime dependencies for a lightweight footprint.

Usage Examples

Validation

import { validateIBAN } from 'finprim';
const result = validateIBAN('GB29NWBK60161331926819');
// Output: { valid: true, value: 'GB29NWBK60161331926819', formatted: 'GB29 NWBK 6016 1331 9268 19', countryCode: 'GB' }

Formatting

import { formatCurrency } from 'finprim';
const formattedCurrency = formatCurrency(1000.5, 'GBP', 'en-GB');
// Output: '£1,000.50'

Loan Calculation

import { calculateEMI } from 'finprim';
const emi = calculateEMI(100_000, 10, 12); // Monthly payment amount

React Integration

import { useIBANInput } from 'finprim/react';
function PaymentForm() {
  const iban = useIBANInput();
  return <input value={iban.value} onChange={iban.onChange} />;
}

Integration Options

finprim can be imported directly or through additional modules for specific use cases. Choose from:

• finprim: Core library with essential validators and formatters.
• finprim/zod: Zod schemas for seamless validation pipelines.
• finprim/react: React hooks for managing form inputs.
• finprim/nest: NestJS pipes for input validation.

For further details and advanced usage, refer to the API Reference and explore the roadmap for upcoming features.