This feature in miniExtensions form allows you to set special requirements for certain fields. When the user tries to submit the form, this will check if the data input is valid before sending it to Airtable. A simple example, only accept phone numbers that are exactly 10 digits.
Here’s an embedded form that checks if the number of characters in the ID is valid or not.
If you click on the sample view below, you’ll see the table that’s used for the demo above.