Friday Night Funkin' simple chart format fuels massive modding community

The rhythm game Friday Night Funkin' uses a plain JSON format to define its note charts, making the data easy to read and edit. Each note is defined by its timing, direction, and sustain length, with the engine converting musical beats into timestamps. This human-readable design removes technical barriers, allowing creators to make new songs using only a text editor. Consequently, the open format has enabled a vast library of community-created content and mods, far exceeding typical commercial games.