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The main feature of Form Toolkit is captcha. captcha validation cannot be processed client side, it must be processed server side.
Server side validation cannot be turned off however.
in form toolkit, there is a form data binding tool added to the bindings panel.
this can be used to import form dynamic bindings from the form page to the forms action page enabling you to add the server validation to the action page if it is a different page from the form itself.
you could open you form processing page, then go to the bindings panel, click the plus button and select Form Data. in the form data window, click the folder icon and select the form page.
Form toolkit does not include client side validation, client side validation is included with CSS Form Builder.