You can still check the old code with Node and file persistent here: Note Manager
I tried to sync the webapp with Google Drive using the Google Drive API for js v3 but it was frustrating because some methods didn’t work as expected. So after a lot of headaches I decided to build a wrapper around the API, and that´s how gDriveSync.js was born.
I used it successfully in the successor of Note Manager webapp, it´s called Sorter and you can check the code and how it uses the gDriveSync.js library.
The Readme has everything you need to start using the library and also I added examples so you know exactly how to use it. So check it, and let me know if it’s useful, if you want some features, or if there is some bug. gDriveSync.js