byml-v2 is an BYML tool. It can convert documents from BYML (or BYAML) to a human readable format (YAML) and vice versa. It is a newer tool that was written based on analysis of the official BYML code and game code in the executable. As such, this tool supports all the newer node types that are used in Breath of the Wild and other recent Switch games such as Super Mario Odyssey.
byml package. [CLI help]
This tool automatically decompresses Yaz0-encoded files, and re-compresses them if the extension starts with an
byml_to_yml INPUT_FILE.byml OUTPUT_FILE.yml
yml_to_byml [-b] INPUT_FILE.yml OUTPUT_FILE.sbyml(Use
-bfor Wii U only).