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feat(bigquery): support authentication with ADC - #3348
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swarmia-eero
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Oct 6, 2026
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| ### Application Default Credentials (CLI and self-hosted) | ||
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| When running the CLI or a self-hosted `evidence serve`, you can skip the key file and use [Application Default Credentials](https://cloud.google.com/docs/authentication/application-default-credentials) instead: | ||
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| ```yaml | ||
| type: bigquery | ||
| project: my-gcp-project | ||
| adc: true | ||
| datasets: | ||
| - analytics | ||
| ``` | ||
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| Evidence then authenticates with, in order: | ||
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| 1. The key file at `GOOGLE_APPLICATION_CREDENTIALS`. | ||
| 2. Your own login from `gcloud auth application-default login`. | ||
| 3. The attached service account when running on GCP (Cloud Run, GCE, GKE). | ||
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| The identity needs the same **BigQuery Job User** and **BigQuery Data Viewer** roles described above. | ||
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Very open to feedback regarding how the docs should discuss this, especially given that ADC is not supported on the Studio side.
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@swarmia-eero is attempting to deploy a commit to the Evidence Team on Vercel. A member of the Team first needs to authorize it. |
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Summary
Service account keys should be treated as a last resort authentication method in GCP, due to the security risks related to long-living secrets living on disk: https://docs.cloud.google.com/docs/authentication#auth-decision-tree. ADC is most often the preferred method and comes with other upsides for BigQuery work:
This adds ADC as an authentication method for self-hosting and local development. Studio is unchanged.
Smoke-tested locally with a stub project and ADC authentication.