n8n Error Trigger: Send Slack Webhook Failure Alerts

Get instant Slack alerts when your n8n workflows fail

If an n8n workflow crashes, stalls, or throws an error, this n8n Error Trigger workflow automatically detects the failure and sends a Slack-compatible webhook alert with the most important details—so you can respond fast and keep automations running.

What this workflow does

• Triggers on failures using n8n’s built-in Error Trigger for a workflow you choose to monitor.
• Extracts key failure details from the error payload, including:
  • Workflow name
  • Failing node
  • Error message
  • Run mode
  • Start time
  • Execution URL
• Formats a readable, multi-line message containing those specifics for quick troubleshooting.
• Sends the alert via HTTP POST to a Slack (or Slack-compatible) incoming webhook, so messages appear in your selected channel.

Use cases

• Monitor critical automation flows (e.g., lead processing, sync jobs, scheduled tasks) and notify your team immediately on failure.
• Reduce debugging time by receiving the failing node, error text, and a direct execution link in Slack.
• SaaS operators who run multiple n8n workflows can centralize error visibility in one Slack channel.

Technical details

• Error Trigger (global error workflow behavior for monitored execution failures)
• Code node to extract and format failure information
• Sticky Note for in-workflow documentation
• HTTP Request node to POST the formatted message to a Slack-compatible incoming webhook

Setup

• Create or obtain a Slack (or Slack-compatible) incoming webhook URL.
• Replace the placeholder webhook URL in the HTTP Request step.
• In each workflow you want to monitor: Settings → Error Workflow and select this workflow.