These blocks work with JavaScript maps. Almost all blocks can be used browser-side and server-side.
URL Parameters

This block creates a map from the URL parameters of the current page. You can use the block in server or browser-side functions to set the values of fields.
For example, adding the following blocks to a page level handler:

on a form with this URL:
www.mysite.com/testform?reference=123&name=Tim
would create this form helper variable:
URLPARAMS = {
"reference": "123",
"name": "Tim"
}
With a URL like: https://docs.gossinteractive.com/article/4398?REFERENCE=123
You can set the value of a field to that reference number using:

Validation Failed

This block is designed to be used in validation functions. It sets the result as invalid and throws an error that can be caught by the field's error message function.
{
isValid: false,
errorType: 'CUSTOM_ERROR'
}
See Error Message Functions for an example.
