I've seen a JSON parser written in a drag'n'drop visual no-code flowchart-like application that was very impressive and, if printed, would have caused the death

I've seen a JSON parser written in a drag'n'drop visual no-code flowchart-like application that was very impressive and, if printed, would have caused the death of many trees. Utterly unmaintainable and horrifically stupid given any full-code solution would have involved using a pre-written library.