Do you allow 3rd party widgets?

I'm a web designer with a client who needs a form with a certain feature that jotform does not have. They would like, once a street address is entered, for the form to autopopulate the last 4 digits of a 9 digit zip code, since most people dont know their 9 digit zip code. Since jotform cant do this, I was considering having a programmer create an a street address widget that has that functionality. Does jotform allow things like this? Thank you for any feedback.

Hello cgl102770,

Yes it is possible to create your own widget and use it in your form. 

Please take a look at our widget API which should help you create your own widget but you may have to hire an experienced programmer to do this. Please take a look at the following URL :  http://developers.jotform.com/widgets 

Hope this helps.

Do get back to us if you have any questions.

Thank you!