This is a simple node script (only using express and request) which will make a simple request to your provided url and returns it with correct CORS headers.
https://ignorecors-yipksgwdit.now.sh/?url=[full url-encoded url]
Because this is a small side project, currently only JSON is supported. Also, because it's for free there is a fair use policy. Now.sh provides 1GB of bandwidth per month, but you can still just use the code and host it yourself with now.sh.
Also big thanks to now.sh for their free OSS deployments.