Firebase storage get download url

Updated on 18 May 2022
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Article Summary

Generate download URLs for files stored in Firebase Storage. An array of files with a 'uploadPath' or 'path' property should be provided as the input.

If the download URL is successful, the first output is triggered and the files with download URLs are returned.

If download URL generation fails for at least one but not all of them, the second output is triggered.

If the download URL generation fails for all files, the third output is triggered.

Note: Firebase needs to be initialized before this flow function can be used. Also, if access to the Firebase Storage resource is restricted make sure user is authenticated and has the required permissions to access it.

Input arguments

Label	Key	Type	Required?	Default	Description
Files to get download URLs for	`files`	Array	Yes		Object describing the file to get the download URL for.
Custom path	`uploadPath`	String	No	–	Custom path for uploaded files - this determines the folder structure in Firestore. If custom path is not provided (`No value` from binding editor or `undefined` via formula), the folder structure will be copied from the device. Note: that the custom upload and download paths need to match.

Output arguments

Number of outputs: 2

Label	Key	Type	Description
Uploaded files	`files`	Array	Object describing the file with a download URL.
Local path	`files.path`	String	Absolute local filesystem path representing the file location on the device, including the filename and extension. On web, this is created via the [`createObjectURL`](https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL) method.
MIME type	`files.mimeType`	String	MIME type of the file, if it could be determined.
Name	`files.name`	String	Name of the file in the local filesystem, if applicable. Note that the filename and extension are included in the Local path property already.
Size	`files.size`	Number	Size of the file, in bytes.
Created at	`files.createdAt`	String	Creation datetime of the file, if it can be determined.
Modified at	`files.modifiedAt`	String	Datetime when the file was last modified, if it can be determined.
Upload path	`files.uploadPath`	String	Firebase Storage path where the file is uploaded
Upload status	`files.uploadStatus`	Object	Upload status for the file
Download URL	`files.downloadUrl`	String	URL to download the uploaded image. Depending on the Firebase configuration the URL is valid only temporarily and should be re-fetched using the Get Firebase Storage download URL flow function for later access.
Uploaded files	`erroredFiles`	Array	Object describing the file for which the download URL generation failed.
Local path	`erroredFiles.path`	String	Absolute local filesystem path representing the file location on the device, including the filename and extension. On web, this is created via the [`createObjectURL`](https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL) method.
MIME type	`erroredFiles.mimeType`	String	MIME type of the file, if it could be determined.
Name	`erroredFiles.name`	String	Name of the file in the local filesystem, if applicable. Note that the filename and extension are included in the Local path property already.
Size	`erroredFiles.size`	Number	Size of the file, in bytes.
Created at	`erroredFiles.createdAt`	String	Creation datetime of the file, if it can be determined.
Modified at	`erroredFiles.modifiedAt`	String	Datetime when the file was last modified, if it can be determined.
Upload path	`erroredFiles.uploadPath`	String	Firebase Storage path where the file is uploaded
Upload status	`erroredFiles.uploadStatus`	Object	Upload status for the file
Download URL	`erroredFiles.downloadUrl`	String	URL to download the uploaded image. Depending on the Firebase configuration the URL is valid only temporarily and should be re-fetched using the Get Firebase Storage download URL flow function for later access.
Uploaded files	`successfulFiles`	Array	Object describing the file with a download URL.
Local path	`successfulFiles.path`	String	Absolute local filesystem path representing the file location on the device, including the filename and extension. On web, this is created via the [`createObjectURL`](https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL) method.
MIME type	`successfulFiles.mimeType`	String	MIME type of the file, if it could be determined.
Name	`successfulFiles.name`	String	Name of the file in the local filesystem, if applicable. Note that the filename and extension are included in the Local path property already.
Size	`successfulFiles.size`	Number	Size of the file, in bytes.
Created at	`successfulFiles.createdAt`	String	Creation datetime of the file, if it can be determined.
Modified at	`successfulFiles.modifiedAt`	String	Datetime when the file was last modified, if it can be determined.
Upload path	`successfulFiles.uploadPath`	String	Firebase Storage path where the file is uploaded
Upload status	`successfulFiles.uploadStatus`	Object	Upload status for the file
Download URL	`successfulFiles.downloadUrl`	String	URL to download the uploaded image. Depending on the Firebase configuration the URL is valid only temporarily and should be re-fetched using the Get Firebase Storage download URL flow function for later access.

Events

No events.

Errors

Label	Code	Description
Unknown error	`unknown`	Thrown when trying to generate download URLs for files resulted in an unknown error.
All files failed	`allFilesFailed`	Thrown if download URL generation fails for all files
No files to download	`noFilesToDownload`	Thrown if there are no files to generate a download URL for

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Firebase storage upload files

Table of contents

Input arguments
Output arguments
Events
Errors