react-native-format-currency

A lightweight, zero-dependency currency formatter for React Native and Expo built with TypeScript. It supports 165+ ISO 4217 currency codes and provides correct symbol placement, thousands/decimal separators, and negative amount formatting. The library returns both symbol-prefixed and plain values as an array or object. Caching via an internal LRU cache (max 100 entries) ensures fast repeated calls. Unlike locale-based formatters, this uses pre-defined rules for each currency. Stable v1.0.0 — released with minimal breaking changes expected.