Can I include script in your thank you page?

We are using your thankyou page at present when users complete the form. And we would like to include a facebook pixel in there (with javascript) to track conversions. But from what I can tell everytime I include javascript it gets stripped out.

Is there any way to achieve this without going to hosting in our own site?

Unfortunately, scripts are not allowed in any part of the form including the default thank you page. We did this for security reasons. A workaround would be to create a custom thank you HTML or a page in your website and add the script there. Add this as your custom thank you URL in the form:

https://www.jotform.com/help/38-Redirecting-Users-to-a-Different-Page 

This will require you to host the page on your website.