Supabase Storage Tutorial: Upload, Fetch, Sign & List Files

Learn Supabase Storage Fundamentals with n8n

This template demonstrates how to integrate Supabase Storage with n8n for uploading, fetching, generating temporary signed URLs, and listing files. It’s a beginner-friendly workflow that helps you understand how to connect Supabase’s storage API with n8n automation.

Who it’s for Developers and teams new to Supabase who want a hands-on learning workflow.
Anyone looking to automate file uploads and retrieval from Supabase Storage.
Educators or technical teams teaching Supabase fundamentals with practical demos.

How it works Upload File – A user uploads a file through an n8n form, which gets stored in a Supabase storage bucket.
Fetch File – Retrieve files by providing their filename.
Temporary Access – Generate signed URLs with custom expiry for secure file sharing.
List Objects – View all stored files in the chosen Supabase bucket.

How to set up Create a Supabase account and set up a project.
Create a bucket in Supabase (e.g., test-n8n).
Get your Project URL and Anon Key from Supabase.
In n8n, create a Supabase API Credential using your keys.
Import this workflow and connect it with your credentials.
Run the forms to test file upload, retrieval, and listing.

Requirements A Supabase project with storage enabled.
A configured Supabase API Credential in n8n.

Customization Change the bucket name (test-n8n) to your own.
Adjust signed URL expiry times for temporary file access.
Replace Supabase with another S3-compatible storage if needed.
Extend the workflow with notifications (Slack, Email) after file upload.

📝 Lessons Included Lesson 1** – Upload file to Supabase storage.
Lesson 2** – Fetch file from storage.
Lesson 3** – Create a temporary signed document with expiry.
Lesson 4** – List all items in Supabase storage.

🔑 Prerequisites Supabase account + project.
Project URL and API Key (Anon).
Bucket created in Supabase.
Policy created to allow read/write access.
n8n with Supabase API credentials configured.