Skip to main content
n8n can receive Larm alerts via the webhook alert channel using a Webhook trigger node.

​
Setup

​
1. Add a Webhook node in n8n

Create a new workflow in n8n. Add a Webhook node as the trigger. Set the HTTP method to POST. Copy the production URL (not the test URL). It looks like https://your-n8n.example.com/webhook/....
n8n has separate test and production URLs. Use the production URL in Larm — the test URL only works while the workflow editor is open.

​
2. Create a webhook alert channel in Larm

In Larm, go to Alert channels and click New alert channel. Select Webhook as the type and paste the n8n production URL.

​
3. Set a custom payload template

Set a structured payload template so each field is available as a separate property in n8n: 
{
  "event": "{{event}}",
  "status": "{{status}}",
  "monitor_name": "{{monitor_name}}",
  "monitor_url": "{{monitor_url}}",
  "timestamp": "{{timestamp}}",
  "last_error": "{{last_error}}",
  "downtime_duration": "{{downtime_duration}}"
}
See Webhooks for all available variables.

​
4. Send a test alert

Activate the workflow in n8n, then click Send test on the alert channel in Larm. Check the n8n execution log to confirm the event was received.

​
5. Add downstream nodes

Add nodes after the Webhook trigger to process the alert — send a message, create a ticket, update a spreadsheet, or anything else n8n supports.

​
Example: Create a Jira ticket when a monitor goes down

  1. Follow the setup above to create the Webhook trigger
  2. Add an If node: check that event equals monitor_down
  3. Add a Jira node on the true branch: Create Issue
  4. Map the fields:
    • Summary: [DOWN] {{monitor_name}}
    • Description: {{monitor_url}} went down at {{timestamp}}. Error: {{last_error}}
  5. Activate the workflow
Larm will create a Jira ticket each time a monitor goes down.