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Error Output Port

When enabled, a node gains a dedicated error port on its right side. If the node fails, execution is routed through this port instead of stopping the workflow.

Enabling the error port​

  1. Click the node to open its Property Sheet.
  2. Go to the Error Handling tab.
  3. Toggle Enable error output port.

A new port appears on the right side of the node card on the canvas.

Connecting the error port​

Connect the error port to any downstream node, just like a regular output port. Nodes on this branch receive an error context object with details about what went wrong.

A typical pattern is:

Main Node ──→ Success Path ──→ ...
      │
      └── (error port) → Log Error / Send Alert → ...

Error data​

Downstream nodes on the error branch can reference the failure details via $status:

{{ $status['NodeName'].errorMessage }}

You can also check whether the node succeeded or failed from any downstream node regardless of branch:

{{ $status['NodeName'].isSuccess }}

Combining with other options​

  • Error port + Continue on error: the workflow continues on the success path and triggers the error branch. Use this only if you need both paths to run independently.
  • Error port + Retry: the node retries first; only if all retries are exhausted does execution route to the error port.

Use cases​

  • Send a Slack message when a critical HTTP request fails
  • Log detailed error information to a database
  • Implement a fallback operation when the primary node fails