CORS via Greasemonkey/Tampermonkey
This script enables web front-end developers to bypass CORS to directly access other domains in the easiest and no-fuss way.
The most important update of v2.0 compared to v1.0 is support for non-text type response data!
(Just install this script and open the console on this page to try it out!)
Simplest trial
CORSViaGM.init()
fetch('https://example.com')
(Bad fun)
Replace any first picture on the current page with the DuckDuckGo icon.
CORSViaGM.init()
url = 'https://duckduckgo.com/favicon.ico'
img = Object.assign(new Image, { src: URL.createObjectURL(await (await fetch(url)).blob()) })
document.querySelector('img')?.replaceWith(img)
(More advanced)
If you want to await window._CORSViaGM.inited, add the following element to the <head> of your index.html:
<script>
window._CORSViaGM = (inited => ({ inited: Object.assign(new Promise(r => inited = r), { done: inited }) }))()
</script>