What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately we have no provision for sending expiry notification for forms at the present.
I have submitted your inquiry as a feature request to our development team, we will update you on this thread regarding its progress
In addition to what my colleague Sammy has already said, please note that, as a workaround, you can make your form unavailable after a certain expiration date.
You can set it up by going to Setup & Embed > Preferences > Form Limits, and setting the Expiration Date of your form.
You can read this guide for more details about setting up form limits: How-to-Limit-Submissions-in-a-Form
It will not send a notification when the expiration date is near, but it will prevent users from submitting the form any further once the set date has passed. Hope this helps.