n8n Error Alert Workflow: Slack + Email Notifications

Stop n8n failures before they turn into customer downtime

This n8n Error Alert Workflow automatically detects when any workflow execution fails, classifies the error into category and severity, then immediately notifies your team via Slack (Incoming Webhook) and email.

What this workflow does

• Auto-triggers on execution errors from other n8n workflows by enabling it as the instance error workflow.
• Extracts workflow + execution details and attempts to derive an HTTP status when possible.
• Classifies the failure using JavaScript logic to produce: category, severity, and a recommended next action.
• Sends a formatted Slack alert using a Slack Incoming Webhook, including the failure summary, category, status, and a link to the execution when available.
• Sends a plain-text email with the same failure details plus troubleshooting guidance.

Use cases

• Missed integrations: your Slack/email alerts fire when an API call fails inside an n8n workflow.
• SaaS operations: track failed automation runs with severity-based routing and recommended next steps.
• Production reliability: quickly identify which workflow failed and what HTTP status was returned (when detectable).

Technical details

• Error trigger: receives error events when configured in n8n instance error workflow settings.
• Classifier: JavaScript logic categorizes severity and generates a dedupeKey to suppress repeats.
• Slack: posts alerts via HTTP request to a Slack Incoming Webhook URL.
• Email: sends alerts using the Email Send node with an SMTP credential.
• Setup requirements: a Slack Incoming Webhook URL and an SMTP email credential.

Available customization: route by severity (e.g., send critical items to Slack while warnings roll into a daily digest) and suppress duplicates using dedupeKey so alerts don’t spam every run.