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.
Validation option is available in the form builder. Just click the field you'd like to add validation check and click "Validation" on the top toolbar then select what validation type you like for that field.
If this is not what you mean, kindly provide more details about your question so we can assist you further. Thanks!