Populate form fields with existing data.

I want to create a registration form where someone can enter say just their name or their email, and have all other fields automatically filled if the record is already in our database. Can I do that with Jotform?

Unfortunately it is not possible to populate form fields with data from any external source or previous submission data. 

You may like to take a look at our "Spreadsheet to Form" widget and see if that fits into your requirement. You can upload excel file with all your data and form fields can be populated with based on unique column of excel. You may like to take a look at the following guide which should help you: https://www.jotform.com/help/442-How-to-Use-the-Spreadsheet-to-Form-Widget

Hope this helps.

Do get back to us if you have any questions.