Firebase Storage Migration

Supabase provides several tools to convert storage files from Firebase Storage to Supabase Storage. Conversion is a two-step process:

1. Files are downloaded from a Firebase storage bucket to a local filesystem.
2. Files are uploaded from the local filesystem to a Supabase storage bucket.

Set up the migration tool #

1. Clone the firebase-to-supabase repository:

1. In the /storage directory, rename supabase-keys-sample.js to supabase-keys.js.
2. Go to your Supabase project's API settings in the Dashboard.
3. Copy the Project URL and update the SUPABASE_URL value in supabase-keys.js.
4. Under Project API keys, copy the service_role key and update the SUPABASE_KEY value in supabase-keys.js.

Generate a Firebase private key #

1. Log in to your Firebase Console and open your project.
2. Click the gear icon next to Project Overview in the sidebar and select Project Settings.
3. Click Service Accounts and select Firebase Admin SDK.
4. Click Generate new private key.
5. Rename the downloaded file to firebase-service.json.

Command line options#

Download Firestore Storage bucket to a local filesystem folder #

node download.js <prefix> [<folder>] [<batchSize>] [<limit>] [<token>]

• <prefix>: The prefix of the files to download. To process the root bucket, use an empty prefix: "".
• <folder>: (optional) Name of subfolder for downloaded files. The selected folder is created as a subfolder of the current folder (e.g., ./downloads/). The default is downloads.
• <batchSize>: (optional) The default is 100.
• <limit>: (optional) Stop after processing this many files. For no limit, use 0.
• <token>: (optional) Begin processing at this pageToken.

To process in batches using multiple command-line executions, you must use the same parameters with a new <token> on subsequent calls. Use the token displayed on the last call to continue the process at a given point.

Upload files to Supabase Storage bucket #

node upload.js <prefix> <folder> <bucket>

• <prefix>: The prefix of the files to download. To process all files, use an empty prefix: "".
• <folder>: Name of subfolder of files to upload. The selected folder is read as a subfolder of the current folder (e.g., ./downloads/). The default is downloads.
• <bucket>: Name of the bucket to upload to.

Resources#

• Supabase vs Firebase
• Firestore Data Migration
• Firebase Auth Migration