The workflow JSON
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{
"id": "g3q68zSOQvTcydLs",
"name": "Calculate the Centroid of a Set of Vectors",
"tags": [],
"nodes": [
{
"id": "32a8aa56-aa7e-4c9e-a39e-f65234224bcf",
"name": "Receive Vectors",
"type": "n8n-nodes-base.webhook",
"position": [
-440,
20
],
"parameters": {
"path": "centroid",
"options": {},
"responseMode": "responseNode"
},
"notesInFlow": true,
"typeVersion": 2
},
{
"id": "a020a49a-cc9f-49af-aa95-829d9d16da04",
"name": "Extract & Parse Vectors",
"type": "n8n-nodes-base.set",
"position": [
360,
20
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "3e1d9e72-7668-427d-958c-42bff7270a37",
"name": "vectors",
"type": "array",
"value": "={{ $json.query.vectors }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "2f328de6-4ef1-4aac-8838-d616637f4b88",
"name": "Validate & Compute Centroid",
"type": "n8n-nodes-base.code",
"position": [
960,
20
],
"parameters": {
"jsCode": "const input = items[0].json;\nconst vectors = input.vectors;\n\nif (!Array.isArray(vectors) || vectors.length === 0) {\n return [{ json: { error: \"Invalid input: Expected an array of vectors.\" } }];\n}\n\nconst dimension = vectors[0].length;\nif (!vectors.every(v => v.length === dimension)) {\n return [{ json: { error: \"Vectors have inconsistent dimensions.\" } }];\n}\n\nconst centroid = new Array(dimension).fill(0);\nvectors.forEach(vector => {\n vector.forEach((val, index) => {\n centroid[index] += val;\n });\n});\n\nfor (let i = 0; i < dimension; i++) {\n centroid[i] /= vectors.length;\n}\n\nreturn [{ json: { centroid } }];"
},
"typeVersion": 2
},
{
"id": "821bc173-3578-4cf2-9fd7-8ea9cba8dc3f",
"name": "Return Centroid Response",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1640,
20
],
"parameters": {
"options": {}
},
"typeVersion": 1.1
},
{
"id": "73964e7b-1217-422f-8078-09604fa2a3d7",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
20,
-200
],
"parameters": {
"color": 3,
"width": 620,
"height": 420,
"content": "\ud83d\udccc **Description:** \nThis node extracts the `vectors` array from the **GET request** and converts it into a properly formatted array for processing. \n- **Ensures `vectors` is a valid array.** \n- **If the parameter is missing, it may generate an error.** \n\n\ud83d\udd39 **Expected Output Example:**\n```json\n{\n \"vectors\": [[2,3,4],[4,5,6],[6,7,8]]\n}\n```\n"
},
"typeVersion": 1
},
{
"id": "e4793b20-bfa6-4b08-b46c-f92d1c9c2622",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
640,
-280
],
"parameters": {
"color": 4,
"width": 700,
"height": 500,
"content": "\ud83d\udccc **Description:** \nThis node performs **vector validation** and **centroid computation**. \n- **Validation:** Ensures all vectors have the same number of dimensions. \n- **Computation:** Averages each dimension to determine the centroid. \n- **If validation fails:** Returns an error message indicating inconsistent dimensions. \n\n\ud83d\udd39 **Successful Output Example:**\n```json\n{\n \"centroid\": [4,5,6]\n}\n```\n\ud83d\udd39 **Error Output Example:**\n```json\n{\n \"error\": \"Vectors have inconsistent dimensions.\"\n}\n```\n"
},
"typeVersion": 1
},
{
"id": "e0ac1c4d-0435-44d1-ba87-0cfc9dea207b",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
1340,
-200
],
"parameters": {
"color": 2,
"width": 680,
"height": 420,
"content": "\ud83d\udccc **Description:** \nThis node sends the **final response** back to the client that made the request. \n- **If the computation is successful**, it returns the centroid. \n- **If an error occurs**, it returns a descriptive error message. \n\n\ud83d\udd39 **Example Response:**\n```json\n{\n \"centroid\": [4, 5, 6]\n}\n```\n"
},
"typeVersion": 1
},
{
"id": "2b4fbae7-c2e5-4666-ba9f-72a5313fc16f",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-820,
-200
],
"parameters": {
"color": 4,
"width": 840,
"height": 420,
"content": "\ud83d\udccc **Description:** \nThis node acts as the **entry point** for the workflow, receiving a **GET request** containing an array of vectors in the `vectors` parameter. \n- **Expected Input:** `vectors` parameter in JSON format. \n- **Example Request:** \n ```plaintext\n https://actions.singular-innovation.com/webhook-test/centroid?vectors=[[2,3,4],[4,5,6],[6,7,8]]\n ```\n- **Output:** Passes the received data to the next node for processing.\n"
},
"typeVersion": 1
}
],
"active": true,
"settings": {
"executionOrder": "v1"
},
"versionId": "f9c7fa52-264b-4967-ae7a-62247cce7a50",
"connections": {
"Receive Vectors": {
"main": [
[
{
"node": "Extract & Parse Vectors",
"type": "main",
"index": 0
}
]
]
},
"Extract & Parse Vectors": {
"main": [
[
{
"node": "Validate & Compute Centroid",
"type": "main",
"index": 0
}
]
]
},
"Validate & Compute Centroid": {
"main": [
[
{
"node": "Return Centroid Response",
"type": "main",
"index": 0
}
]
]
}
}
}
About this workflow
Calculate the Centroid of a Set of Vectors. Uses respondToWebhook, stickyNote. Webhook trigger; 8 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →