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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Thank you for contacting us.
In order to change the Thank You Page please follow the next steps:
1. Open your form.
2. Click on "Setup and Embed" tab on the form builder toolbar.
3. Click on "Thank You" icon.
4. Select "Custom URL" or "Thank You message" option to set your custom Thank You Page.
Please feel free to contact us if you need any further assistance.
Is this possible through APIs ?
I'll forward your question to our developer team, they will it better than me, also you could ask them directly at this link http://api.jotform.com/docs/#contact.
Yes, it is possible via API: