Create a service account for developers.google.com and download the credentials.
Share the sheet with the service account.
export GCLOUD_PROJECT={project ID of your google project}
export GOOGLE_APPLICATION_CREDENTIALS=./service_account_credentials.json
node test.js <your google sheet's spreadsheet id> <sheet name of the worksheet>
Much cred to Mandeep Singh's blog article: https://codingfundas.com/how-to-read-edit-google-sheets-using-node-js/index.html