Actions9
Overview
This node generates a presigned PUT URL for uploading an object to a MinIO bucket. A presigned PUT URL allows users or external systems to upload files directly to a specified bucket and key in MinIO, without needing direct access to credentials. This is useful for securely allowing uploads from clients, web applications, or third-party services.
Common scenarios:
- Allowing end-users to upload files (e.g., images, documents) directly to your MinIO storage via a temporary, secure link.
- Integrating with external systems that need to send data/files to your storage without exposing your MinIO credentials.
- Automating file ingestion pipelines where upload permissions are time-limited and controlled.
Example:
A web application requests a presigned PUT URL from n8n, then provides it to the browser so the user can upload a file directly to MinIO.
Properties
| Display Name | Type | Meaning |
|---|---|---|
| Bucket | Resource Locator | The target MinIO bucket. Can be selected from a list or entered manually by name. |
| Key | String | The object key (path/filename) within the bucket where the uploaded file will be saved. |
Output
The node outputs a JSON object with the following structure:
{
"url": "<presigned_put_url>"
}
- url: The generated presigned PUT URL. Use this URL to upload a file to the specified bucket and key.
Dependencies
- MinIO server: You must have access to a running MinIO instance.
- API Credentials: Requires valid MinIO credentials configured in n8n as
minioCredentialsApi. - n8n Configuration: The node must be properly set up with the correct credentials and network access to the MinIO server.
Troubleshooting
Common issues:
Missing credentials:
Error message:No credentials got returned!
Resolution: Ensure you have set up MinIO credentials in n8n and selected them in the node.Invalid bucket or key:
Error message: May receive errors from MinIO if the bucket does not exist or the key is invalid.
Resolution: Double-check the bucket name and key. Make sure the bucket exists and you have permission to write to it.Network/connectivity errors:
Error message: Errors related to connecting to MinIO.
Resolution: Verify that n8n can reach the MinIO server (correct endpoint, port, firewall rules).Operation not supported:
Error message:The operation "..." is not supported!
Resolution: Ensure you have selected a supported operation.