This paper documents the initial stages of an experiment in creating ephemeral live coding languages – “JSoLangs” – for diverse artistic, educational, and critical purposes. The experiment takes place in the context of the larger Estuary project: a browser-based, collaborative platform that allows multiple, distinct live coding notations/languages to interoperate. An emerging feature of the Estuary platform is the ability to create ephemeral esolangs (esoteric programming languages) on the fly, within a collaborative Estuary ensemble. These “JSoLangs” take the form of small (or not so small) JavaScript programs that transpile live coded text into one or more of Estuary’s underlying languages.