Dumpall

List all ids registered.

Command /dumpall to run, dump to <installation folder>/dumpall directory. Output files are tsv format, they have only single column; as just resource locations/identifiers lists.

Each files located as registry ids.
For example items is dumped in <installation folder>/dumpall/minecraft/item.tsv
another example biome tag is dumped in <installation folder>/dumpall/minecraft/tags/worldgen/biome.tsv

I hope this mod can be of help you in building datapacks or modpacks. The output files of this mod are simple tsv, you can process these outputs into what useable for you working on.