> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mage.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Google Cloud Storage

## Configuration

To set up the Google Cloud Storage source, provide the following configuration parameters:

| Key                             | Description                                                                                                                                            | Sample Value                                |
| ------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------- |
| `path_to_credentials_json_file` | Path to your Google service account credentials JSON file. If Mage is running on GCP, you can leave this `null` to use the instance’s service account. | `/path/to/service_account_credentials.json` |
| `bucket`                        | Name of the Google Cloud Storage bucket to read data from.                                                                                             | `my_bucket`                                 |
| `file_type`                     | Type of the files in the bucket. Supported values: `parquet`, `csv`.                                                                                   | `parquet`                                   |
| `credentials_info`              | Alternative way to specify Google service account credentials directly as a dictionary.                                                                | Structure shown below                       |
| `prefix`                        | A prefix used to filter blobs in the bucket. Only blobs whose names start with this prefix will be included.                                           | `sales_data_`                               |

<br />

**`credentials_info` structure:**

```yaml theme={"system"}
type: str
project_id: str
private_key_id: str
private_key: str
client_email: str
client_id: str
auth_uri: str
token_uri: str
auth_provider_x509_cert_url: str
client_x509_cert_url: str
universe_domain: str
```