Want to read from Google Spreadsheet with NodeJS/ExpressJS and output as JSON? Use this repo, just include your own credential.json, change the spreadsheetID and range.
Resources: https://developers.google.com/sheets/api/quickstart/nodejs
How to get credential.json? 1-Check this out over here, https://developers.google.com/sheets/api/quickstart/nodejs 2-Click on: 'ENABLE THE GOOGLE SHEETS API'
How to find spreadsheet ID? -Check this stackoverflow link: https://stackoverflow.com/questions/36061433/how-to-do-i-locate-a-google-spreadsheet-id