Lab
Form Builder
An extension's params.schema and params.ui, rendered the way the inspector renders them: JSON Forms plus the x-inflow-ui renderers. Edit either side and the form follows. Fields without x-inflow-ui fall through to the vanilla renderer set untouched — that is the whole opt-in design, visible here.
Runs entirely in your browser — nothing you type here is sent anywhere. The action registry backing these buttons (noop, refreshForm, loadLabels) is fixed for the demo: a schema naming an action the host never registered is inert rather than fatal, which the Unknown action sample shows.