This converter no longer works with FNF charts as of version 0.3.0 (and probably earlier).
I don't have plans to update this converter, so this repository will remain archived. There are other, better FNF/SM converters out there.

Original README is as follows:

Roughly convert Friday Night Funkin .json charts to doubles simfiles for StepMania
Or convert StepMania simfiles to FNF charts.
Very WIP but it works, kinda.

Usage: Drag-and-drop the FNF .json chart or a StepMania .sm simfile onto fnf-to-sm.exe
Or use the command line: python fnf-to-sm.py [chart_file]

For FNF-to-SM, if you input the Normal difficulty .json, and have the
easy & hard .jsons in the same folder, then FNF-to-SM will output
a single .sm with all 3 difficulties.

SM-to-FNF currently only supports Challenge Single difficulty.
The output "blammed.json" is meant to replace "Blammed", Normal difficulty.

Written by shockdude in Python 3.7
Original chart-to-sm.js by Paturages
https://github.com/Paturages/

Project Outfox (active StepMania fork): https://projectmoon.dance/
Friday Night Funkin: https://ninja-muffin24.itch.io/funkin