How do I set a character limit in a text field so that it can't be less than 6 or more than 6?

I need to create a text field that must be 6 digits in length.  I do not want entries more or less than 6, but I'm having trouble using the text character limit function.

I presume what you want to do is set a specific character limit, is that correct? In that case, you can use the "Input Mask" on a "Text Box" field instead.

Here's how it looks like in action:

You can also try this widget that we have: https://widgets.jotform.com/widget/masked_input. To add a widget on your form, you can follow this guide: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form 

I hope that helps.