Dinero.js is a JavaScript and TypeScript library for creating, calculating, and formatting money safely.
The core problem it solves is that language primitives alone cannot properly represent monetary values. Dinero.js provides a dedicated abstraction for money that treats amounts as immutable objects, ensuring that every operation returns a new instance with no side effects. This immutability model prevents accidental mutations and makes reasoning about monetary state easier. The library supports multiple precision modes, defaulting to JavaScript numbers but allowing bigint for handling large amounts, and can represent non-decimal currencies with any base or multi-subdivision structure.
Developers should choose this tool when building applications that require reliable money handling without the pitfalls of floating-point arithmetic. It suits projects ranging from e-commerce platforms to financial applications where correctness is critical. The library is framework-agnostic and works in any JavaScript environment. Its tree-shakeable design means you import only the functions you need, keeping bundle sizes minimal. The first-class TypeScript support with full type inference makes it particularly valuable in typed codebases.
The project maintains active continuous integration with automated testing. Development follows a structured approach with comprehensive documentation covering quick starts, core concepts, guides for specific use cases, and a complete API reference. The maintainers provide agent skills to help AI coding assistants understand best practices and correct usage patterns for the library.
