fppd
fppd/condition/preview
Preview a single If/Conditional Check leaf's current raw value - the same lookup evaluate() uses internally (Variable/Expression/Setting/Time/MQTT/ GPIO Pin/Sensor/Sun), before any comparator/Value is applied. Backs the If condition editor's "Show Current Value" button, so picking the right Value to compare against isn't guesswork.
get/api/fppd/condition/preview
Query parameters
sourcestring
One of the If Check "Source" dropdown values (e.g. "Variable", "GPIO Pin").
namestring
The Name/Expression field for that source.
Response
{"found": true, "value": "..."} or {"found": false} if the source/name doesn't currently resolve.