This workflow follows the HTTP Request → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Observe any n8n workflow and post rich error alerts to Slack",
"nodes": [
{
"parameters": {
"content": "## Overview\n\nDrop the **Org21-Observer** node inline anywhere in a workflow and it will capture per-node metadata, items, timing, and errors \u2014 then POST the whole payload to the sub-flow below. The sub-flow filters for errors and posts a rich, contextual Slack alert.\n\n## How to use\n\n1. **Install** `n8n-nodes-org21` via **Settings \u2192 Community nodes**.\n2. **Configure Slack credentials** on the *Post to Slack* node (no API keys live in this template).\n3. **Activate the sub-flow** (right branch), copy its Webhook URL.\n4. Paste that URL into the **Webhook URL** field of the *Org21-Observer* node.\n5. Execute the main branch \u2014 any error on any upstream node will light up Slack with workflow name, failing node, timing, and the payload that caused the failure.\n\n## Customize\n\n- Swap the Manual Trigger + HTTP Request + Set for **your** real workflow. The Observer is drop-in.\n- Swap Slack for Teams / Discord / email \u2014 keep the sub-flow, replace only the last node.\n- Disable `Include Item Data` on the Observer if payloads contain PII.\n",
"height": 420,
"width": 520
},
"id": "note-overview",
"name": "Overview",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
100,
80
]
},
{
"parameters": {
"content": "## Org21-Observer\n\nSits **inline** (not at the end) \u2014 `Pass Through` is on, so your workflow keeps running normally. The Observer only fans the sniffed payload sideways to the sub-flow.\n\nIf the upstream HTTP Request fails, `Include Errors` captures the error object; otherwise the payload still lands with timing + metadata. The sub-flow decides whether to alert.",
"height": 280,
"width": 320
},
"id": "note-observer",
"name": "About Observer",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
880,
80
]
},
{
"parameters": {
"content": "## Sub-flow\n\nReceives every Observer POST. The `IF` filters for runs that carried a non-empty `errors` array \u2014 silent success executions don't alert.\n\n**To swap Slack** for another channel: delete the *Post to Slack* node and drop in Microsoft Teams / Discord / Gmail. The formatted message from the *Format Alert* Set node works for any text channel.",
"height": 280,
"width": 320
},
"id": "note-subflow",
"name": "About Sub-flow",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
880,
560
]
},
{
"parameters": {},
"id": "trigger-main",
"name": "When clicking 'Execute workflow'",
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
240,
300
]
},
{
"parameters": {
"url": "https://api.example.com/health",
"options": {}
},
"id": "http-example",
"name": "Example HTTP Request",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4,
"position": [
460,
300
]
},
{
"parameters": {
"assignments": {
"assignments": [
{
"id": "a1",
"name": "status",
"value": "={{ $json.status ?? 'unknown' }}",
"type": "string"
}
]
},
"options": {}
},
"id": "set-example",
"name": "Example Transform",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
680,
300
]
},
{
"parameters": {
"triggerMode": "webhook",
"webhookUrl": "PASTE_SUBFLOW_WEBHOOK_URL_HERE",
"includeMetadata": true,
"includeItemData": true,
"includeTiming": true,
"includeErrors": true,
"passThrough": true
},
"id": "observer",
"name": "Org21-Observer",
"type": "n8n-nodes-org21.flowSniffer",
"typeVersion": 1,
"position": [
900,
300
]
},
{
"parameters": {
"httpMethod": "POST",
"path": "org21-observer-alerts",
"options": {}
},
"id": "webhook-sub",
"name": "Observer Webhook",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
240,
700
]
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"typeValidation": "strict"
},
"conditions": [
{
"id": "c1",
"leftValue": "={{ ($json.body?.errors ?? []).length }}",
"rightValue": 0,
"operator": {
"type": "number",
"operation": "gt"
}
}
],
"combinator": "and"
},
"options": {}
},
"id": "if-has-errors",
"name": "Has errors?",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
460,
700
]
},
{
"parameters": {
"assignments": {
"assignments": [
{
"id": "f1",
"name": "formattedMessage",
"value": "=:rotating_light: *n8n workflow error*\nWorkflow: *{{ $json.body.metadata.workflowName }}* (`{{ $json.body.metadata.workflowId }}`)\nExecution: `{{ $json.body.metadata.executionId }}`\nFailing node: *{{ $json.body.metadata.nodeName }}*\nDuration: {{ $json.body.timing?.durationMs }} ms \u2014 items: {{ $json.body.timing?.itemCount }}\nError: ```{{ JSON.stringify($json.body.errors, null, 2).slice(0, 900) }}```",
"type": "string"
}
]
},
"options": {}
},
"id": "set-format",
"name": "Format Alert",
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
680,
700
]
},
{
"parameters": {
"resource": "message",
"operation": "post",
"select": "channel",
"channelId": {
"__rl": true,
"value": "",
"mode": "list",
"cachedResultName": ""
},
"text": "={{ $json.formattedMessage }}",
"otherOptions": {}
},
"id": "slack-post",
"name": "Post to Slack",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.2,
"position": [
900,
700
]
}
],
"connections": {
"When clicking 'Execute workflow'": {
"main": [
[
{
"node": "Example HTTP Request",
"type": "main",
"index": 0
}
]
]
},
"Example HTTP Request": {
"main": [
[
{
"node": "Example Transform",
"type": "main",
"index": 0
}
]
]
},
"Example Transform": {
"main": [
[
{
"node": "Org21-Observer",
"type": "main",
"index": 0
}
]
]
},
"Observer Webhook": {
"main": [
[
{
"node": "Has errors?",
"type": "main",
"index": 0
}
]
]
},
"Has errors?": {
"main": [
[
{
"node": "Format Alert",
"type": "main",
"index": 0
}
],
[]
]
},
"Format Alert": {
"main": [
[
{
"node": "Post to Slack",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
},
"staticData": null,
"tags": [
{
"name": "observability"
},
{
"name": "alerting"
},
{
"name": "slack"
}
],
"triggerCount": 0,
"meta": {
"templateCredsSetupCompleted": false
},
"versionId": ""
}
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About this workflow
Observe any n8n workflow and post rich error alerts to Slack. Uses httpRequest, n8n-nodes-org21, slack. Event-driven trigger; 11 nodes.
Source: https://github.com/Org21-ai/n8n-nodes-org21/blob/450fc4312ad3dcbea938fc2cd351d9bbb99050f1/templates/01-slack-error-alerts.json — original creator credit. Request a take-down →
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