# Export files to Google Storage

Robot: `/google/store`

🤖/google/store exports encoding results to Google Storage.

The URL to the exported file in your Google bucket will be presented in the Transloadit <dfn>Assembly Status</dfn> JSON. This <dfn>Robot</dfn> can also be used to export encoded files to Google's Firebase as demonstrated in [this blogpost](/blog/2018/12/2h-youtube-clone.md).

Stage: ga

## Usage example

Export uploaded files to \`my\_target\_folder\` on Google Storage:

```json
{
  "steps": {
    "exported": {
      "robot": "/google/store",
      "use": ":original",
      "credentials": "YOUR_GOOGLE_CREDENTIALS",
      "path": "my_target_folder/${unique_prefix}/${file.url_name}"
    }
  }
}
```

## Parameters

* `interpolate`: Controls whether Assembly Variables are interpolated for individual instruction fields.

  By default, most Robot instruction fields interpolate Assembly Variables. Set this to `false` to treat every instruction field as literal text, or set an individual field path to `false` to treat only that field as literal text. For Robot-specific fields that are literal by default, set this to `true` or set that field path to `true` to opt back into interpolation.

  Use field names such as `path`, or dotted paths such as `ffmpeg.vf` for nested objects.

* `output_meta`: Allows you to specify a set of metadata that is more expensive on CPU power to calculate, and thus is disabled by default to keep your Assemblies processing fast.

  For images, you can add `"has_transparency": true` in this object to extract if the image contains transparent parts and `"dominant_colors": true` to extract an array of hexadecimal color codes from the image.

  For images, you can also add `"blurhash": true` to extract a [BlurHash](https://blurha.sh) string — a compact representation of a placeholder for the image, useful for showing a blurred preview while the full image loads.

  For videos, you can add the `"colorspace": true` parameter to extract the colorspace of the output video.

  For videos, you can also add `"interlaced": true` to detect whether the video is interlaced. This combines the cheap ffprobe `field_order` flag with a bounded `idet` sampling pass over the first frames of the source, exposing `interlaced`, `field_order`, and a diagnostic `interlace_detection` object under `file.meta`. This is computationally expensive and billed accordingly.

  For audio, you can add `"mean_volume": true` to get a single value representing the mean average volume of the audio file.

  You can also set this to `false` to skip metadata extraction and speed up transcoding.

* `user_meta`: Adds custom metadata to each file emitted by this Robot without modifying the file’s contents.

  The values are merged with any existing `user_meta` carried by the input file. If both objects contain the same key, this Robot’s value takes precedence. Assembly Variables are supported, for example `{ "internal_file_id": "${file.id}" }`.

* `result`: Whether the results of this Step should be present in the Assembly Status JSON

* `queue`: Setting the queue to 'batch', manually downgrades the priority of jobs for this step to avoid consuming Priority job slots for jobs that don't need zero queue waiting times

* `force_accept`: Force a Robot to accept a file type it would have ignored.

  By default, Robots ignore files they are not familiar with.
  [🤖/video/encode](/docs/robots/video-encode.md), for
  example, will happily ignore input images.

  With the `force_accept` parameter set to `true`, you can force Robots to accept all files thrown at them.
  This will typically lead to errors and should only be used for debugging or combatting edge cases.

* `ignore_errors`: Ignore errors during specific phases of processing.

  Setting this to `["meta"]` will cause the Robot to ignore errors during metadata extraction.

  Setting this to `["execute"]` will cause the Robot to ignore errors during the main execution phase.

  Setting this to `true` is equivalent to `["meta", "execute"]` and will ignore errors in both phases.

* `use`: Specifies which Step(s) to use as input.

  * You can pick any names for Steps except `":original"` (reserved for user uploads handled by Transloadit)
  * You can provide several Steps as input with arrays:
    ```json
    {
      "use": [
        ":original",
        "encoded",
        "resized"
      ]
    }
    ```
  * You can also tag input Steps with `as` to pass semantic intent to robots:
    ```json
    {
      "use": [
        {
          "name": ":original",
          "as": "image"
        },
        {
          "name": ":original",
          "as": "mask"
        }
      ]
    }
    ```

  > [!Tip]
  > That's likely all you need to know about `use`, but you can view [Advanced use cases](/docs/topics/use-parameter.md).

* `credentials`: Create a new [Google service account](https://cloud.google.com/storage/docs/authentication). Set its role to "Storage Object Creator". Choose "JSON" for the key file format and download it to your computer. You will need to upload this file when creating your <dfn>Template Credentials</dfn>.

  Go back to your Google credentials project and enable the "Google Cloud Storage JSON API" for it. Wait around ten minutes for the action to propagate through the Google network. Grab the project ID from the dropdown menu in the header bar on the Google site. You will also need it later on.

  Now you can set up the `storage.objects.create` and `storage.objects.delete` permissions. The latter is optional and only required if you intend to overwrite existing paths.

  To do this from the Google Cloud console, navigate to "IAM & Admin" and select "Roles". From here, click "Create Role", enter a name, set the role launch stage to *General availability,* and set the permissions stated above.

  Next, go to Storage browser and select the ellipsis on your bucket to edit bucket permissions. From here, select "Add Member", enter your service account as a new member, and select your newly created role.

  Then, create your associated [Template Credentials](/c/template-credentials/) in your Transloadit account and use the name of your <dfn>Template Credentials</dfn> as this parameter's value.

* `path`: The path at which the file is to be stored. This may include any available [Assembly Variables](/docs/topics/assembly-instructions.md#assembly-variables).

* `acl`: The permissions used for this file.

* `cache_control`: The `Cache-Control` header determines how long browsers are allowed to cache your object for. Values specified with this parameter will be added to the object's metadata under the `Cache-Control` header. For more information on valid values, take a look at the [official Google documentation](https://cloud.google.com/storage/docs/metadata#cache-control).

* `url_template`: The URL of the file in the result JSON. This may include any of the following supported [Assembly variables](/docs/topics/assembly-instructions.md#assembly-variables).

* `ssl_url_template`: The SSL URL of the file in the result JSON. The following [Assembly variables](/docs/topics/assembly-instructions.md#assembly-variables) are supported.