Is it possible to store a JSON file to an ENV variable with dotenv?

You could just put the item on one line like:

VITE_FIREBASE={"apiKey":"slslsls","slsls":"lelsls"}

You just have to make sure your keys have quotes in them.

and get them (SvelteKit example) like so:

const p = process?.env ? process.env : import.meta.env;

const firebase_config = JSON.parse(p.VITE_FIREBASE);

Convert the JSON object to string and store it in the ENV

You can use JSON.dump to convert JSON object to string

and then in your controller JSON.parse(ENV['CLIENT_SECRET'])

Alternatively

you can create a google_session.rb inside initializers folder

$google_session = GoogleDrive::Session.from_service_account_key(
   # config goes here
)

and in your controller you will have access to $google_session global variable

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