I am trying to access the content of tag inside iframe. structure of iframe is look like this:

there is json data inside the pre tag. how should I access it. I Tried all these:

 const iframe = document.getElementById('iframe')  as HTMLIFrameElement;
 const theHtml = iframe.contentWindow.document.body.getElementsByTagName('pre')[0];
 console.log(theHtml);
 console.log(iframe.contentWindow);
 console.log(iframe.contentWindow.document);
 console.log(iframe.contentWindow.document.body);
 console.log(iframe.contentWindow.document.body.innerHTML);

Can someone please help out.