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Sending cross origin GET requests using iframe with javascript

Prashant

I used an iframe to get a json file from another site, the json file is displaying in the iframe, but how to i get the text?

heres my current progress

let unique_name = 0;

function req(url) {
        let iframe_name = (unique_name++).toString();
        let iframe = document.createElement('iframe');
        // iframe.style.display = 'none';
        document.body.appendChild(iframe);
        iframe.contentWindow.name = iframe_name;
        iframe.contentWindow.location.href = url;

        // return iframe.contentWindow.document;
}