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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I am not really sure I understand your question fully. But if you meant you do not want to publish live yet your created form, you can do so.
Just create the form in your Form Builder and do not publish it so it won't be available live.
Hope this help. Let us know how we can be of further assistance.
The issue arises when we have already published an existing form for the public. Then later on we need to implement some changes. While we work and update the new form, the existing published one should keep running, whil we make changes and test a new setup. Only when we re-publish, should the new form be visible to the end users. I believe this feature should be able to implement using versioning in some way. How can we do this today?
If you have not used the full source code published code of the form, all other publish method will auto update your published form every time you update/modify the form on your Form Builder.
User guide: Which-Form-Embed-Code-Should-I-Use
If I understand correctly now, you want to have some feature like a dev version and a live version of the form. Wherein the dev version instance is separate to the live version instance.
Currently there is no dev version and live version option for the same form.
But what you can try doing is to clone the form and make the clone version your development version. Once satisfied with the development of the dev version you can just apply all the new modifications/updates on the live version.
Hope this help. Let us know how it goes.