whatwg-fetch

A lightweight polyfill for the Fetch API, implementing a subset of the standard Fetch specification to replace XMLHttpRequest in web applications. Current stable version is 3.6.20, released on 2023-12-14. This package is the de facto standard for adding fetch support in older browsers; it is actively maintained by the GitHub community and has minimal dependencies. Note that it only works in browser environments, not Node.js, and for very old browsers a separate Promise polyfill is required.