web-streams-polyfill provides a spec-compliant, fully-tested implementation of the WHATWG Streams API for browsers and Node.js. This package enables developers to utilize modern stream concepts like ReadableStream, WritableStream, and TransformStream across different environments, even those without native support. It improves code portability and allows applications to reliably interact with streamed data using a standardized interface. By using this polyfill, developers can adopt Streams API features today.
Web-streams-polyfill releases were frequent in 2016 and 2019, with several versions each month, then slowed down considerably; there were no releases between 2017 and 2018. Since 2020 until today there has been one release every few months. Overall, the releases have become less consistent over time.
Web-streams-polyfill downloads show a strong upward trend from March 2024 to August 2025, peaking at over 84 million. September 2025 downloads are significantly lower, likely due to the month being incomplete as of today, September 11, 2025.
