We have recently updated the documentation of the Glyphs file format. This should be of interest to users building custom tooling that reads and processes .glyphs and .glyphspackage files.
You can view the file format description on the GlyphsSDK GitHub page:
- Glyphs File Format, Version 3
- Glyphs File Format, Version 2 (Glyphs 2 and earlier)
Also, the JSON Schema files have been updated to match. You can use these to learn about all the technical details for the format and for automated validation.
Let us know is anything is unclear or missing.