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

As state above, the official Heroku documentation works (https://elements.heroku.com/buildpacks/buyersight/heroku-google-application-credentials-buildpack).

For PHP Laravel users though, the config variable GOOGLE_APPLICATION_CREDENTIALS should be set to ../google-credentials.json. Otherwise, PHP will not find the file.

Screenshot from Heroku

Answer 2

You can create the JSON key file by adding a .profile file to the repo, which will be executed when Heroku starts up the container.

Set a config variables:

heroku config:set GOOGLE_APPLICATION_CREDENTIALS=gcp_key.json
heroku config:set GOOGLE_CREDENTIALS=<CONTENTS OF YOU GCP KEY>

The GOOGLE_CREDENTIALS is easier to set in the Heroku dashboard.

Create a .profile with a line to write the json file:

echo ${GOOGLE_CREDENTIALS} > /app/gcp_key.json

Obviously, commit the changes to .profile and push to heroku.

---

The recommended buildpack doesn't work anymore and, in any case, this feels more direct without being hard.

Answer 3

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"
  }

Answer 4

The buildpack mentioned by Maxime Boué is not working anymore because of the Heroku updates(18+). However, below is a similar buildpack which is working. It is actually a fork from the previous one.

• Use the below link in the buildpack setting of your Heroku app settings https://github.com/gerywahyunugraha/heroku-google-application-credentials-buildpack
• Define in Config Vars GOOGLE_CREDENTIALS as key and content of your credential file as Value
• Define in Config Vars GOOGLE_APPLICATION_CREDENTIALS as Key and google-credentials.json as Value
• Redeploy the application, it should work!!