The workflow JSON
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{
"nodes": [
{
"id": "0d911b91-bb9a-4177-8cd5-12ddddf1bc61",
"name": "When clicking \u2018Test workflow\u2019",
"type": "n8n-nodes-base.manualTrigger",
"position": [
580,
405
],
"parameters": {},
"typeVersion": 1
},
{
"id": "d13f78f7-4093-435f-8b38-722f4a5c7a1f",
"name": "Loop Over Items",
"type": "n8n-nodes-base.splitInBatches",
"position": [
1020,
405
],
"parameters": {
"options": {}
},
"typeVersion": 3
},
{
"id": "97d26220-a85f-4c40-b97c-b36f2d235776",
"name": "Webhook Callback Wait",
"type": "n8n-nodes-base.wait",
"position": [
1720,
445
],
"parameters": {
"resume": "webhook",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 1.1
},
{
"id": "ee02d5cb-8151-4b24-a630-77a677b1434a",
"name": "Update finishedSet",
"type": "n8n-nodes-base.code",
"position": [
1940,
445
],
"parameters": {
"jsCode": "let json = $('If All Finished').first().json;\nif (!json.finishedSet) json.finishedSet = [];\nlet finishedItemId = $('Webhook Callback Wait').item.json.body.finishedItemId;\nif (!json.finishedSet[finishedItemId]) json.finishedSet.push(finishedItemId);\nreturn [json];"
},
"typeVersion": 2
},
{
"id": "09f1cf3f-9e32-43f2-9e57-d7a33970dac4",
"name": "Initialize finishedSet",
"type": "n8n-nodes-base.set",
"position": [
1240,
285
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "193ab8f1-0e23-491c-914e-b8b26b0160f7",
"name": "finishedSet",
"type": "array",
"value": "[]"
}
]
}
},
"executeOnce": true,
"typeVersion": 3.4
},
{
"id": "105d8f64-8ade-4e02-8722-587a35f2b046",
"name": "Simulate Multi-Item for Parallel Processing",
"type": "n8n-nodes-base.code",
"position": [
780,
405
],
"parameters": {
"jsCode": "return [\n {requestId: 'req4567'},\n {requestId: 'req8765'},\n {requestId: 'req1234'}\n];"
},
"typeVersion": 2
},
{
"id": "c5f72fa0-693e-4134-910f-8fd0767861d1",
"name": "If All Finished",
"type": "n8n-nodes-base.if",
"position": [
1460,
285
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 1,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "385c3149-3623-4dd2-9022-770c32f82421",
"operator": {
"type": "number",
"operation": "gte"
},
"leftValue": "={{ $json.finishedSet.length }}",
"rightValue": "={{ $('Simulate Multi-Item for Parallel Processing').all().length }}"
}
]
}
},
"typeVersion": 2
},
{
"id": "20d16393-8573-4cc1-adc0-034f0f1def70",
"name": "Start Sub-Workflow via Webhook",
"type": "n8n-nodes-base.httpRequest",
"position": [
1180,
645
],
"parameters": {
"url": "={{ $env.WEBHOOK_URL }}/webhook/parallel-subworkflow-target",
"method": "POST",
"options": {},
"sendBody": true,
"sendHeaders": true,
"bodyParameters": {
"parameters": [
{
"name": "requestItemId",
"value": "={{ $json.requestId }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "callbackurl",
"value": "={{ $execution.resumeUrl }}"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "4ad48520-39b3-4016-a6a9-dd789c079e08",
"name": "Acknowledge Finished",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1780,
665
],
"parameters": {
"options": {}
},
"typeVersion": 1.1
},
{
"id": "ad1018a1-3b9d-4613-b23f-136763a514ba",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
720,
605
],
"parameters": {
"color": 3,
"width": 390,
"height": 109,
"content": "### Start Multiple Sub-Workflows Asynchronously\n* Note: Callback/Webhook \"internal\" Base-URL should be configured in the n8n instance to reference the k8s service name and internal port."
},
"typeVersion": 1
},
{
"id": "f4171d39-8bfe-4e3a-9b94-87d969abda2d",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
1740,
365
],
"parameters": {
"color": 3,
"width": 283,
"height": 80,
"content": "### Pseudo-Synchronously Wait for All Sub-Workflows to finish"
},
"typeVersion": 1
},
{
"id": "98657cd3-968c-4d66-aea0-4e3180f8508f",
"name": "Continue Workflow (noop)",
"type": "n8n-nodes-base.noOp",
"position": [
1780,
205
],
"parameters": {},
"typeVersion": 1
},
{
"id": "5a9518ea-456e-4975-bf6f-71bf9ed0a6e1",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
540,
180
],
"parameters": {
"width": 1577.931818181817,
"height": 684.1818181818179,
"content": "## Main/Parent Workflow\n* This starts multiple executions of the sub-workflow in parallel and then loops until they all report back."
},
"typeVersion": 1
},
{
"id": "13ad3423-c3bf-4144-b76d-03daa8877bed",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
560,
900
],
"parameters": {
"width": 1477.331211260329,
"height": 189.2194473140495,
"content": "### Sub-Workflow\n**Cut/Paste this into a separate workflow, and activate it!!!**"
},
"typeVersion": 1
},
{
"id": "e92865b0-b3e9-4195-ae16-5c199875a04b",
"name": "Wait",
"type": "n8n-nodes-base.wait",
"position": [
1440,
940
],
"parameters": {},
"typeVersion": 1.1
},
{
"id": "710456c8-394d-4c45-8d8e-16e0a4095dc3",
"name": "Call Resume on Parent Workflow",
"type": "n8n-nodes-base.httpRequest",
"notes": "The callback resumes the parent workflow and reports which item finished. There could be a race condition if the parent workflow was just resumed by a different sub-workflow but hasn't entered a webhook-wait again yet. The delay and retry mitigates for the possibility that multiple subtasks complete and call back at once.",
"position": [
1660,
940
],
"parameters": {
"url": "={{ $('Webhook').item.json.headers.callbackurl }}",
"method": "POST",
"options": {},
"sendBody": true,
"bodyParameters": {
"parameters": [
{
"name": "finishedItemId",
"value": "={{ $('Webhook').item.json.body.requestItemId }}"
}
]
}
},
"retryOnFail": true,
"typeVersion": 4.2,
"waitBetweenTries": 3000
},
{
"id": "2ee41b1a-89f0-4d2f-b2ff-74aef5baaa70",
"name": "Respond to Webhook",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1220,
940
],
"parameters": {
"options": {},
"respondWith": "json",
"responseBody": "={{ \n{\n \"finishedItemId\": $json.body.requestItemId\n}\n}}"
},
"typeVersion": 1.1
},
{
"id": "04445a9a-61f9-468e-8589-3eeb403f2553",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
1000,
940
],
"parameters": {
"path": "parallel-subworkflow-target",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2
}
],
"connections": {
"Wait": {
"main": [
[
{
"node": "Call Resume on Parent Workflow",
"type": "main",
"index": 0
}
]
]
},
"Webhook": {
"main": [
[
{
"node": "Respond to Webhook",
"type": "main",
"index": 0
}
]
]
},
"If All Finished": {
"main": [
[
{
"node": "Continue Workflow (noop)",
"type": "main",
"index": 0
}
],
[
{
"node": "Webhook Callback Wait",
"type": "main",
"index": 0
}
]
]
},
"Loop Over Items": {
"main": [
[
{
"node": "Initialize finishedSet",
"type": "main",
"index": 0
}
],
[
{
"node": "Start Sub-Workflow via Webhook",
"type": "main",
"index": 0
}
]
]
},
"Respond to Webhook": {
"main": [
[
{
"node": "Wait",
"type": "main",
"index": 0
}
]
]
},
"Update finishedSet": {
"main": [
[
{
"node": "Acknowledge Finished",
"type": "main",
"index": 0
}
]
]
},
"Acknowledge Finished": {
"main": [
[
{
"node": "If All Finished",
"type": "main",
"index": 0
}
]
]
},
"Webhook Callback Wait": {
"main": [
[
{
"node": "Update finishedSet",
"type": "main",
"index": 0
}
]
]
},
"Initialize finishedSet": {
"main": [
[
{
"node": "If All Finished",
"type": "main",
"index": 0
}
]
]
},
"Start Sub-Workflow via Webhook": {
"main": [
[
{
"node": "Loop Over Items",
"type": "main",
"index": 0
}
]
]
},
"When clicking \u2018Test workflow\u2019": {
"main": [
[
{
"node": "Simulate Multi-Item for Parallel Processing",
"type": "main",
"index": 0
}
]
]
},
"Simulate Multi-Item for Parallel Processing": {
"main": [
[
{
"node": "Loop Over Items",
"type": "main",
"index": 0
}
]
]
}
}
}
About this workflow
Pattern For Parallel Sub Workflow Execution Followed By Wait For All Loop. Uses manualTrigger, splitInBatches, httpRequest, respondToWebhook. Event-driven trigger; 18 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →