The Temporal proposal is a JavaScript API that aims to standardize duration parsing, but it's not yet production-ready. In the meantime, alternative libraries like tinyduration and moment.js can be used to parse ISO 8601 durations in JavaScript. The Temporal API offers a more modern and intuitive interface for working with durations, but its implementation may require additional setup and configuration. Tinyduration is another option that provides a simple way to parse duration strings, while moment.js offers more advanced features like converting durations to milliseconds or human-readable format. These libraries can be useful alternatives until the Temporal API becomes widely adopted.