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.
You can make the fields as a required/mandatory field by selecting the field and then enabling the option Required for the field. Please see the screenshot below:
When the field is left empty while submitting the form, it should be displaying an error that the field is required as shown below:
Hope this information helps!