ser goes to http://yoursite.com/your-typeform-page?code=1 using a browser, that page needs to add a IFRAME with url as data-url=https://yoursite.typeform.com/to/U5aOQR?code=
I think your question is a duplicate of this question.
You can see a working example I made on Glitch
You can edit here.
Steps to reproduce:
Extract parameters from URL
let params = new URLSearchParams(location.search);
Reconstruct your form URL
url += "?utm_source=" + params.get('utm_source');
Display form in a target div
window.typeformEmbed.makeWidget(
embedElement,
url,
{
hideHeaders: true,
hideFooter: true,
}
);```
Hope it helps :)