I've used YJS and can strongly recommend. https://github.com/yjs/yjs https://github.com/yjs/yjs Built a Google Docs like rich text collaborator for a client on

I've used YJS and can strongly recommend. https://github.com/yjs/yjs https://github.com/yjs/yjs Built a Google Docs like rich text collaborator for a client on Express/Psql and React. Worked like a charm. The hardest part was dealing with ports on AWS to be honest.