JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
I'm not sure if I understand your query correctly. Do you mean to get the JotForm username using API? If so, please refer to the API documentation below that can help you with this.
If you are looking for something different, please provide us with more information on your requirement so that we can guide you in the right direction.