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What Databases can I use?
Form.io runs on and requires MongoDB (or compatible) database as our server utilizes the dynamic nature JSON data storage such as dynamic fields and multi value fields. This allows for maximum flexibility with forms, apis and databases.
But Can I save data to my SQL Database?
The SQL Connector can be used to map the data to your own SQL database. This will move the data from mongodb to SQL using the connector. https://help.form.io/developers/sql-connector
The submission event could also be intercepted and sent directly to your own API endpoint by bypassing our submission API. By doing this you can store the data wherever needed, but this will also bypass the Form.io server side validation and actions system, which are incredibly capable features which you may want to use.