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

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Created by: Alok Kumar || alokkumar

Alok Kumar

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Last update a month ago

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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

  1. Upload File – A user uploads a file through an n8n form, which gets stored in a Supabase storage bucket.
  2. Fetch File – Retrieve files by providing their filename.
  3. Temporary Access – Generate signed URLs with custom expiry for secure file sharing.
  4. 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.