How to use Google API credentials json on Heroku?

Question

I\'m making an app using Google Calendar API, and planning to build it on Heroku.
I have a problem about authentication. Usually I use credential json file for that, but

Answer 1

you can change the scripts like this in your packge.json, set the file json path in GOOGLE_APPLICATION_CREDENTIALS

"scripts": {
    "start": "GOOGLE_APPLICATION_CREDENTIALS=./yourfile.json node app.js"
  }