js-fetch
is a basic wrapper around the Javascript Fetch API. At the moment, its main use is for retrieving JSON from external URLs (using cors-anywhere.herokuapp.com).
Code examples can be found in tests/tests.html. Live examples here.
jsDelivr can be used to serve a specific version (see tags for version numbers):
<script src="https://cdn.jsdelivr.net/gh/nyg/js-fetch@x.y.z/fetch.js"></script>