Automated File Upload to Supabase Storage via n8n

This workflow automates the process of uploading files to a Supabase Storage bucket directly from an external workflow or form submission. It is designed to handle different file types by categorizing them into specific storage buckets based on MIME type, converting base64-encoded data back into binary files, and securely generating signed URLs for accessing the uploaded files. The setup allows for seamless, automated file management and secure sharing of storage objects, ideal for developers and businesses integrating n8n with Supabase for storage solutions.

The workflow begins with a trigger node activated either by another workflow or by a test form submission. It then prepares the upload data by determining the appropriate storage bucket according to the MIME type (images, audio, videos, or documents). The encoded base64 data is converted into a binary file suitable for uploading. Next, the file is sent to Supabase Storage via HTTP POST request, followed by generating a signed URL to enable secure, temporary access to the uploaded object.

Error handling nodes are included to ensure proper feedback in case of upload or signing failures, and it outputs the final signed URL for use in other applications or sharing. This workflow is particularly useful for automating large-scale file management, API integrations, or empowering users to upload content directly via web forms without exposing security credentials.