Nesho Neshev This workflow corresponds to n8n.io template #13863 — we link there as the canonical source.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"meta": {
"templateCredsSetupCompleted": false
},
"name": "Prevent duplicate webhook executions in n8n",
"tags": [],
"nodes": [
{
"id": "sticky-explain",
"name": "What this does",
"type": "n8n-nodes-base.stickyNote",
"position": [
-400,
80
],
"parameters": {
"color": 7,
"width": 380,
"height": 500,
"content": "## Prevent duplicate webhook executions\n\nMany webhook providers use at-least-once delivery.\nIf a webhook times out or fails, the same event may be sent again.\nFrom n8n's perspective it looks like a new trigger \u2014 the workflow executes twice.\n\nThis template adds an idempotency check before any side effect:\n\u2022 Stripe charge\n\u2022 Email send\n\u2022 Database insert\n\u2022 API call\n\nIf the same `idempotency_key` appears again within 24 hours,\nAARI returns `decision: BLOCK` and the workflow stops.\n\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nFingerprint fallback order\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n1. body.id / event_id / eventId / webhook_id\n2. headers x-event-id / x-request-id\n3. type:event:action:created:data.object.id:order_id:\u2026\n4. execution.id (same-execution only \u2014 not retry-safe)\n\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nWho this is for\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nAnyone running n8n workflows that receive webhooks and perform side effects \u2014 payments, emails, DB writes, API calls.\n\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nRequirements\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nFree AARI account \u2192 api.getaari.com/n8n\n2,500 gate calls/month \u00b7 No credit card"
},
"typeVersion": 1
},
{
"id": "sticky-setup",
"name": "Setup",
"type": "n8n-nodes-base.stickyNote",
"position": [
-400,
620
],
"parameters": {
"color": 4,
"width": 380,
"height": 340,
"content": "## Setup (2 minutes)\n\n**1. Get a free AARI API key:**\nhttps://api.getaari.com/n8n\n\n**2. Create n8n credential:**\nCredentials \u2192 New \u2192 Header Auth\nHeader name: `X-API-Key`\nValue: your AARI key\n\nSelect it in the **AARI idempotency gate** node.\n\n**3. idempotency_key is pre-set** \u2014 auto-detects the event ID from the payload (Stripe, GitHub, Shopify, etc.) or falls back to a body fingerprint.\n\n**4. Connect your action:**\nReplace **\u2705 Run your action here** with your real node \u2014 Stripe charge, send email, DB insert, API call, etc."
},
"typeVersion": 1
},
{
"id": "sticky-test",
"name": "Test",
"type": "n8n-nodes-base.stickyNote",
"position": [
-400,
1000
],
"parameters": {
"color": 3,
"width": 380,
"height": 160,
"content": "## Test it\n\nSend the same webhook payload twice.\n\nFirst call \u2192 `decision: ALLOW`\nSecond call \u2192 `decision: BLOCK`\n\nThe duplicate is caught before any action runs."
},
"typeVersion": 1
},
{
"id": "webhook-node",
"name": "Incoming webhook event",
"type": "n8n-nodes-base.webhook",
"position": [
240,
300
],
"parameters": {
"path": "webhook-dedup",
"options": {},
"httpMethod": "POST",
"responseMode": "onReceived"
},
"typeVersion": 2
},
{
"id": "aari-gate-node",
"name": "AARI idempotency gate",
"type": "n8n-nodes-base.httpRequest",
"position": [
480,
300
],
"parameters": {
"url": "https://api.getaari.com/gate",
"method": "POST",
"options": {
"timeout": 10000
},
"sendBody": true,
"specifyBody": "keypair",
"authentication": "genericCredentialType",
"bodyParameters": {
"parameters": [
{
"name": "agent_id",
"value": "={{ $workflow.name }}"
},
{
"name": "run_id",
"value": "={{ $execution.id }}"
},
{
"name": "action_type",
"value": "workflow.side_effect"
},
{
"name": "resource",
"value": "n8n"
},
{
"name": "idempotency_key",
"value": "={{ $json.body?.id || $json.body?.event_id || $json.body?.eventId || $json.body?.webhook_id || $json.headers?.['x-event-id'] || $json.headers?.['x-request-id'] || [$json.body?.type, $json.body?.event, $json.body?.action, $json.body?.created, $json.body?.data?.object?.id, $json.body?.resource_id, $json.body?.order_id, $json.body?.customer_id, $json.body?.object_id].filter(v => v != null && v !== '').join(':') || $execution.id + '_action' }}"
},
{
"name": "environment",
"value": "prod"
},
{
"name": "mode",
"value": "advisory"
}
]
},
"genericAuthType": "httpHeaderAuth"
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
},
"typeVersion": 4.1
},
{
"id": "if-block-node",
"name": "Duplicate detected?",
"type": "n8n-nodes-base.if",
"position": [
720,
300
],
"parameters": {
"options": {},
"conditions": {
"options": {
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "decision-check",
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.decision }}",
"rightValue": "BLOCK"
}
]
}
},
"typeVersion": 2
},
{
"id": "blocked-node",
"name": "\u26d4 Stop duplicate execution",
"type": "n8n-nodes-base.set",
"position": [
960,
160
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "blocked-status",
"name": "status",
"type": "string",
"value": "duplicate_blocked"
},
{
"id": "blocked-reason",
"name": "reason",
"type": "string",
"value": "={{ $json.policy_hits ? $json.policy_hits.join(', ') : 'idempotency.duplicate' }}"
}
]
}
},
"typeVersion": 3.3
},
{
"id": "allowed-node",
"name": "\u2705 Run your action here",
"type": "n8n-nodes-base.set",
"position": [
960,
440
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "allowed-status",
"name": "status",
"type": "string",
"value": "approved"
},
{
"id": "allowed-decision",
"name": "decision",
"type": "string",
"value": "={{ $json.decision }}"
},
{
"id": "allowed-action-id",
"name": "action_id",
"type": "string",
"value": "={{ $json.action_id }}"
}
]
}
},
"typeVersion": 3.3
},
{
"id": "complete-node",
"name": "\ud83d\udccb Report SUCCESS",
"type": "n8n-nodes-base.httpRequest",
"position": [
1200,
440
],
"parameters": {
"url": "={{ 'https://api.getaari.com/actions/' + $json.action_id + '/complete' }}",
"method": "POST",
"options": {
"timeout": 5000
},
"jsonBody": "{\n \"outcome\": \"SUCCESS\"\n}",
"sendBody": true,
"specifyBody": "json",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth"
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
},
"typeVersion": 4.1
}
],
"notes": "Prevent duplicate webhook executions using AARI idempotency.\n\nQuick start:\n1. Get a free key: https://api.getaari.com/n8n\n2. Create Header Auth credential: X-API-Key \u2192 your key\n3. Replace 'Run your action here' with your real action node",
"settings": {
"executionOrder": "v1"
},
"staticData": null,
"connections": {
"Duplicate detected?": {
"main": [
[
{
"node": "\u26d4 Stop duplicate execution",
"type": "main",
"index": 0
}
],
[
{
"node": "\u2705 Run your action here",
"type": "main",
"index": 0
}
]
]
},
"AARI idempotency gate": {
"main": [
[
{
"node": "Duplicate detected?",
"type": "main",
"index": 0
}
]
]
},
"Incoming webhook event": {
"main": [
[
{
"node": "AARI idempotency gate",
"type": "main",
"index": 0
}
]
]
},
"\u2705 Run your action here": {
"main": [
[
{
"node": "\ud83d\udccb Report SUCCESS",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
httpHeaderAuth
Pro
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About this workflow
This template is for anyone running n8n workflows that receive webhooks and perform side effects such as payments, emails, database inserts, or API calls.
Source: https://n8n.io/workflows/13863/ — original creator credit. Request a take-down →
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