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.

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    Prevent Duplicate Entries

    Asked by mdscj1 on October 09, 2016 at 09:16 PM

    How do I prevent duplicate entries on my forms?  In other words, if an email was already used previously, and that email is being used again, I want the person to get a message that tells them that email already exist.

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    JotForm Support

    Answered by liyam on October 09, 2016 at 10:28 PM


    You can enable unique questions on your form and set the email address field as your unique field. This way, it will only allow the email address to be submitted once. Further submissions of the same email address shall no longer be allowed. You can refer to this guide on how to enable the unique question feature on your form: https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question

    If you have questions, please let us know.