This workflow follows the Google Sheets → HTTP Request recipe pattern — see all workflows that pair these two integrations.
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 →
{
"name": "Prompt Engine 2.0 Workflow",
"nodes": [
{
"parameters": {
"httpMethod": "POST",
"path": "generate-prompt",
"options": {}
},
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"typeVersion": 1,
"position": [
250,
300
]
},
{
"parameters": {
"values": {
"string": [
{
"name": "query",
"value": "={{ $json.body.query }}"
},
{
"name": "style",
"value": "={{ $json.body.style || 'Silicon Valley' }}"
},
{
"name": "modelTarget",
"value": "={{ $json.body.modelTarget || 'Claude' }}"
},
{
"name": "version",
"value": "={{ $json.body.version || 'full' }}"
}
]
},
"options": {}
},
"name": "Extract Parameters",
"type": "n8n-nodes-base.set",
"typeVersion": 1,
"position": [
450,
300
]
},
{
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $json.query }}",
"operation": "isNotEmpty"
}
]
}
},
"name": "Validate Input",
"type": "n8n-nodes-base.if",
"typeVersion": 1,
"position": [
650,
300
]
},
{
"parameters": {
"filePath": "=/root/prompt-engine-2.0/system-message{{ $json.version === 'short' ? '-short' : $json.version === 'minimal' ? '-minimal' : '' }}.txt"
},
"name": "Load System Message",
"type": "n8n-nodes-base.readBinaryFile",
"typeVersion": 1,
"position": [
850,
200
]
},
{
"parameters": {
"content": "={{ $json.data.toString('utf8') }}",
"options": {}
},
"name": "Convert to Text",
"type": "n8n-nodes-base.set",
"typeVersion": 1,
"position": [
1050,
200
]
},
{
"parameters": {
"authentication": "headerAuth",
"url": "https://api.anthropic.com/v1/messages",
"options": {
"headers": {
"entries": [
{
"name": "anthropic-version",
"value": "2023-06-01"
}
]
}
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={\n \"model\": \"claude-3-5-sonnet-latest\",\n \"max_tokens\": 4000,\n \"temperature\": 0.2,\n \"system\": \"{{ $node['Convert to Text'].json.content }}\",\n \"messages\": [\n {\n \"role\": \"user\",\n \"content\": \"{{ $node['Extract Parameters'].json.query }}\\n\\nParameters:\\n- Style: {{ $node['Extract Parameters'].json.style }}\\n- Target model: {{ $node['Extract Parameters'].json.modelTarget }}\\n- Output: 2 variants + comparison + recommendations\\n- Reasoning: provide brief bullet reasoning\"\n }\n ]\n}"
},
"name": "Call Anthropic API",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.1,
"position": [
1250,
200
],
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"values": {
"string": [
{
"name": "generatedPrompt",
"value": "={{ $json.content[0].text }}"
},
{
"name": "model",
"value": "={{ $json.model }}"
},
{
"name": "tokensInput",
"value": "={{ $json.usage.input_tokens }}"
},
{
"name": "tokensOutput",
"value": "={{ $json.usage.output_tokens }}"
},
{
"name": "stopReason",
"value": "={{ $json.stop_reason }}"
}
]
},
"options": {}
},
"name": "Format Response",
"type": "n8n-nodes-base.set",
"typeVersion": 1,
"position": [
1450,
200
]
},
{
"parameters": {
"content": "={\n \"success\": true,\n \"data\": {\n \"prompt\": {{ $json.generatedPrompt }},\n \"metadata\": {\n \"model\": {{ $json.model }},\n \"tokens\": {\n \"input\": {{ $json.tokensInput }},\n \"output\": {{ $json.tokensOutput }}\n },\n \"stopReason\": {{ $json.stopReason }}\n }\n }\n}",
"options": {}
},
"name": "Success Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
1650,
200
]
},
{
"parameters": {
"respondWith": "json",
"responseBody": "={\n \"success\": false,\n \"error\": \"Invalid request\",\n \"message\": \"Query parameter is required\"\n}",
"options": {
"responseCode": 400
}
},
"name": "Error - Missing Query",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
850,
400
]
},
{
"parameters": {
"respondWith": "json",
"responseBody": "={\n \"success\": false,\n \"error\": \"API Error\",\n \"message\": \"{{ $json.message || 'Failed to generate prompt' }}\",\n \"details\": \"{{ $json.description }}\"\n}",
"options": {
"responseCode": 500
}
},
"name": "Error - API Failure",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
1450,
400
]
},
{
"parameters": {
"operation": "append",
"fileId": {
"__rl": true,
"value": "your-google-sheet-id",
"mode": "id"
},
"values": {
"value": "={{ [\n {\n timestamp: new Date().toISOString(),\n query: $node['Extract Parameters'].json.query,\n style: $node['Extract Parameters'].json.style,\n modelTarget: $node['Extract Parameters'].json.modelTarget,\n tokensInput: $json.tokensInput,\n tokensOutput: $json.tokensOutput,\n model: $json.model\n }\n] }}"
},
"options": {}
},
"name": "Log to Google Sheets (Optional)",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4,
"position": [
1650,
350
],
"disabled": true,
"notes": "Enable this node to log all requests to Google Sheets for analytics"
},
{
"parameters": {
"operation": "sendMessage",
"chatId": "your-slack-channel-id",
"text": "=New Prompt Generated!\n\nQuery: {{ $node['Extract Parameters'].json.query }}\nStyle: {{ $node['Extract Parameters'].json.style }}\nTokens: {{ $json.tokensOutput }}\n\nPrompt preview:\n{{ $json.generatedPrompt.substring(0, 200) }}...",
"otherOptions": {}
},
"name": "Notify Slack (Optional)",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.1,
"position": [
1650,
500
],
"disabled": true,
"notes": "Enable this node to get Slack notifications for each generation"
}
],
"connections": {
"Webhook": {
"main": [
[
{
"node": "Extract Parameters",
"type": "main",
"index": 0
}
]
]
},
"Extract Parameters": {
"main": [
[
{
"node": "Validate Input",
"type": "main",
"index": 0
}
]
]
},
"Validate Input": {
"main": [
[
{
"node": "Load System Message",
"type": "main",
"index": 0
}
],
[
{
"node": "Error - Missing Query",
"type": "main",
"index": 0
}
]
]
},
"Load System Message": {
"main": [
[
{
"node": "Convert to Text",
"type": "main",
"index": 0
}
]
]
},
"Convert to Text": {
"main": [
[
{
"node": "Call Anthropic API",
"type": "main",
"index": 0
}
]
]
},
"Call Anthropic API": {
"main": [
[
{
"node": "Format Response",
"type": "main",
"index": 0
}
],
[
{
"node": "Error - API Failure",
"type": "main",
"index": 0
}
]
]
},
"Format Response": {
"main": [
[
{
"node": "Success Response",
"type": "main",
"index": 0
},
{
"node": "Log to Google Sheets (Optional)",
"type": "main",
"index": 0
},
{
"node": "Notify Slack (Optional)",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
},
"staticData": null,
"tags": [
{
"name": "Prompt Engine",
"id": "1"
},
{
"name": "AI",
"id": "2"
}
],
"meta": {
"templateCredsSetupCompleted": false
},
"versionId": "1.0.0"
}
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
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About this workflow
Prompt Engine 2.0 Workflow. Uses readBinaryFile, httpRequest, googleSheets, slack. Webhook trigger; 12 nodes.
Source: https://github.com/gacabartosz/prompt-engine-2.0/blob/87e635b84586880d5edf005492fb6977ee8be876/examples/n8n/prompt-engine-workflow.json — original creator credit. Request a take-down →
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