This package contains resources to access Google AI/ML models and other Google services. Authorization to these services use either an API Key or service account credentials that are included in an environment variable.

If you are running this on the Google Cloud Platform, or in a way where service account credentials can be stored on a file system, consider using the @langchain/google-gauth package instead. You do not need to use both packages. See the section on Authorization below.

$ yarn add @langchain/google-webauth

Authorization is either done through the use of an API Key, if it is supported for the service you're using, or a Google Cloud Service Account.

To handle service accounts, this package uses the google-auth-library package, and you may wish to consult the documentation for that library about how it does so. But in short, classes in this package will use credentials from the first of the following that apply:

1. An API Key that is passed to the constructor using the apiKey attribute
2. Credentials that are passed to the constructor using the authInfo attribute
3. An API Key that is set in the environment variable API_KEY
4. The Service Account credentials that are saved directly into the GOOGLE_WEB_CREDENTIALS
5. The Service Account credentials that are saved directly into the GOOGLE_VERTEX_AI_WEB_CREDENTIALS (deprecated)