How to Build an n8n Error Workflow with Slack Alerts

steps

1. Create an Error Workflow
   Open your n8n instance and create a new workflow. Name it Error Demo to keep things organized.

2. Add the Error Trigger Node

   • Add the Error Trigger node to your workflow as its starting point.
   • No configurations are required for this node.
   • Test the node by executing it and observe the sample error details that appear.

3. Connect Google Sheets

   • Add a Google Sheets node connected to the Error Trigger node.
   • Configure the Google Sheets node to use the "Append Row" operation.
   • Authorize your Google account through the OAuth2 option (if not done already).
   • Select your prepared Google Sheet and its corresponding sheet.
   • Map required fields:
     • Workflow Name: Use the output of the Error Trigger node.
     • Workflow ID, Error URL, and Error Message: Drag relevant fields from the trigger output.

4. Add the Slack Node

   • Add a Slack node and set its operation to "Post Message".
   • Connect your Slack credentials (ensure your bot has adequate permissions).
   • Configure the message format:
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     Error in {{ $node["Error Trigger"].json["workflow.name"] }}
     Workflow ID: {{ $node["Error Trigger"].json["workflow.id"] }}
     Error Node: {{ $node["Error Trigger"].json["error.nodeLabel"] }}
     Message: {{ $node["Error Trigger"].json["error.message"] }}
     Description: {{ $node["Error Trigger"].json["error.description"] }}

   • Choose the Slack channel where alerts will be sent.

5. Link Nodes
   Ensure the Error Trigger node connects to both the Google Sheets and Slack nodes. The execution flow should follow this sequence: Error Trigger → Google Sheets → Slack.

6. Save the Workflow
   Save your workflow to prevent losing progress.

steps

1. Set Up a Test Workflow

   • Create a new workflow and name it Error Test.
   • Add a Schedule Trigger node (e.g., set to every 10 seconds).
   • Add a Code node with an invalid script, such as incomplete or incorrect JavaScript, to force an error.

2. Connect the Test Workflow

   • In the Error Test workflow, open the settings menu (three dots in the top-right corner).
   • Assign the Error Workflow in the “Error Workflow” field and save changes.

3. Activate and Test

   • Activate both workflows (Error Demo and Error Test).
   • Monitor the behavior when the Error Test workflow fails:
     • A Slack alert should be sent to the selected channel.
     • The error details should be appended to the Google Sheet.

4. Refine the Workflow
   If required, adjust message formatting, error descriptions, or field mappings in both the Google Sheets and Slack nodes.