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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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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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    Input Mask: Fill Mask Validation option is not working

    Asked by jiomoney on January 06, 2017 at 04:34 AM

    Please check this

    We need telephone no. to be 10 digits and validated but its not working properly.

    Page URL:

  • Profile Image
    JotForm Support

    Answered by Jim_R on January 06, 2017 at 05:16 AM

    Thanks for reporting this to us. As far as I know, the option to "Fill Mask Validation" was supposed to show an error that the Masked Input field should be filled out.

    It should then behave like so:

    I've escalated this to our Devs and although I won't be able to give you any timeframe, rest assured, we'll keep you apprised on this same thread if/when there's an update.

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    JotForm Developer

    Answered by ceren on January 06, 2017 at 07:30 AM

    Hello jiomoney,

    We're sorry for the inconveniences. Validation problem on phone number field is fixed now.

    If you have any other questions please let us know.

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    Answered by scorrado on January 18, 2017 at 01:04 PM

    Hello, I seem to be having this same issue on one of my forms - https://form.jotform.com/scorrado/serc-referring-provider-request

    I believe I have it set up to accept no more or less than 10 digits but we keep having submissions come in with 9 digits on the fax number.

    Example attached:

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    JotForm Support

    Answered by BJoanna on January 18, 2017 at 02:10 PM


    I have moved your question to separate thread and we will provide you an answer there shortly.