{"workflow":{"id":13863,"name":"Prevent duplicate webhook executions with AARI idempotency gate","views":189,"recentViews":1,"totalViews":189,"createdAt":"2026-03-04T09:42:33.892Z","description":"## Who this template is for\n\nThis template is for anyone running n8n workflows that receive webhooks and perform side effects such as payments, emails, database inserts, or API calls.\n\nWebhook providers commonly use **at-least-once delivery**. If a webhook request times out or fails, the provider retries the same event. From n8n’s perspective this appears as a new trigger, which can cause the workflow to execute twice.\n\n## How it works\n\nThis workflow adds an idempotency check before any side effect runs.\n\nWhen the first event arrives, the workflow records its idempotency key and proceeds normally. If the same event arrives again within 24 hours, the gate returns a BLOCK decision and the workflow stops before any side effects execute.\n\nThe webhook responds immediately with a `200 OK` response., so providers do not retry due to workflow execution time. The idempotency gate then decides whether the workflow should proceed or stop.\n\nThis prevents duplicate executions such as:\n\n- duplicate payments\n- duplicate confirmation emails\n- duplicate database rows\n- duplicate external API calls\n\n## How to set it up\n\nSetup usually takes about **2 minutes**.\n\n1. Create a free AARI API key at **api.getaari.com/n8n**\n2. In n8n go to **Credentials → New → Header Auth**\n3. Set the header name to `X-API-Key`\n4. Paste your API key as the value\n5. Select this credential in the **AARI idempotency gate** node\n6. Replace the placeholder action node with your real workflow action (Stripe, Gmail, Postgres, etc.)\n\nDetailed instructions are included in the sticky notes inside the workflow.\n\n## Requirements\n\n- n8n version 1.0 or later\n- AARI API key (free tier available)\n\n## Customization\n\nYou may need to adjust the `idempotency_key` depending on your webhook payload.\n\nExamples:\n\n- Stripe webhook events: {{ $json.id }}\n- Shopify order events: {{ $json.order_id }}\n- Generic events: combine stable fields such as {{ $json.type }}:{{ $json.created }}\n(for example event type + creation time)\n\nThe key should uniquely identify the event so duplicates can be detected reliably.","workflow":{"meta":{"instanceId":"aari-dedup-template","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 — the workflow executes twice.\n\nThis template adds an idempotency check before any side effect:\n• Stripe charge\n• Email send\n• Database insert\n• API call\n\nIf the same `idempotency_key` appears again within 24 hours,\nAARI returns `decision: BLOCK` and the workflow stops.\n\n────────────────────────────\nFingerprint fallback order\n────────────────────────────\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:…\n4. execution.id (same-execution only — not retry-safe)\n\n────────────────────────────\nWho this is for\n────────────────────────────\nAnyone running n8n workflows that receive webhooks and perform side effects — payments, emails, DB writes, API calls.\n\n────────────────────────────\nRequirements\n────────────────────────────\nFree AARI account → api.getaari.com/n8n\n2,500 gate calls/month · 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 → New → 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** — 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 **✅ Run your action here** with your real node — 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 → `decision: ALLOW`\nSecond call → `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":"AARI API Key"}},"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":"⛔ 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":"✅ 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":"📋 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":"AARI API Key"}},"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 → your key\n3. Replace 'Run your action here' with your real action node","settings":{"executionOrder":"v1"},"staticData":null,"connections":{"Duplicate detected?":{"main":[[{"node":"⛔ Stop duplicate execution","type":"main","index":0}],[{"node":"✅ 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}]]},"✅ Run your action here":{"main":[[{"node":"📋 Report SUCCESS","type":"main","index":0}]]}}},"lastUpdatedBy":1,"workflowInfo":{"nodeCount":9,"nodeTypes":{"n8n-nodes-base.if":{"count":1},"n8n-nodes-base.set":{"count":2},"n8n-nodes-base.webhook":{"count":1},"n8n-nodes-base.stickyNote":{"count":3},"n8n-nodes-base.httpRequest":{"count":2}}},"status":"published","readyToDemo":null,"user":{"name":"Nesho Neshev","username":"neshkito","bio":"Building tools for safer automation workflows.  \nCreator of the webhook idempotency template for n8n.","verified":false,"links":["https://api.getaari.com/n8n"],"avatar":"https://gravatar.com/avatar/c966de5dad0b50e60bab234bcd14f98b8c129123b5d00dacf511288f5fef51fa?r=pg&d=retro&size=200"},"nodes":[{"id":19,"icon":"file:httprequest.svg","name":"n8n-nodes-base.httpRequest","codex":{"data":{"alias":["API","Request","URL","Build","cURL"],"resources":{"generic":[{"url":"https://n8n.io/blog/2021-the-year-to-automate-the-new-you-with-n8n/","icon":"☀️","label":"2021: The Year to Automate the New You with n8n"},{"url":"https://n8n.io/blog/why-business-process-automation-with-n8n-can-change-your-daily-life/","icon":"🧬","label":"Why business process automation with n8n can change your daily life"},{"url":"https://n8n.io/blog/automatically-pulling-and-visualizing-data-with-n8n/","icon":"📈","label":"Automatically pulling and visualizing data with n8n"},{"url":"https://n8n.io/blog/learn-how-to-automatically-cross-post-your-content-with-n8n/","icon":"✍️","label":"Learn how to automatically cross-post your content with n8n"},{"url":"https://n8n.io/blog/automatically-adding-expense-receipts-to-google-sheets-with-telegram-mindee-twilio-and-n8n/","icon":"🧾","label":"Automatically Adding Expense Receipts to Google Sheets with Telegram, Mindee, Twilio, and n8n"},{"url":"https://n8n.io/blog/running-n8n-on-ships-an-interview-with-maranics/","icon":"🛳","label":"Running n8n on ships: An interview with Maranics"},{"url":"https://n8n.io/blog/what-are-apis-how-to-use-them-with-no-code/","icon":" 🪢","label":"What are APIs and how to use them with no code"},{"url":"https://n8n.io/blog/5-tasks-you-can-automate-with-notion-api/","icon":"⚡️","label":"5 tasks you can automate with the new Notion API "},{"url":"https://n8n.io/blog/world-poetry-day-workflow/","icon":"📜","label":"Celebrating World Poetry Day with a daily poem in Telegram"},{"url":"https://n8n.io/blog/automate-google-apps-for-productivity/","icon":"💡","label":"15 Google apps you can combine and automate to increase productivity"},{"url":"https://n8n.io/blog/automate-designs-with-bannerbear-and-n8n/","icon":"🎨","label":"Automate Designs with Bannerbear and n8n"},{"url":"https://n8n.io/blog/how-uproc-scraped-a-multi-page-website-with-a-low-code-workflow/","icon":" 🕸️","label":"How uProc scraped a multi-page website with a low-code workflow"},{"url":"https://n8n.io/blog/building-an-expense-tracking-app-in-10-minutes/","icon":"📱","label":"Building an expense tracking app in 10 minutes"},{"url":"https://n8n.io/blog/5-workflow-automations-for-mattermost-that-we-love-at-n8n/","icon":"🤖","label":"5 workflow automations for Mattermost that we love at n8n"},{"url":"https://n8n.io/blog/how-to-use-the-http-request-node-the-swiss-army-knife-for-workflow-automation/","icon":"🧰","label":"How to use the HTTP Request Node - 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