The workflow JSON
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{
"name": "ComfyUI Image Generation Workflow",
"nodes": [
{
"parameters": {
"httpMethod": "POST",
"path": "comfyui-trigger",
"responseMode": "responseNode",
"options": {}
},
"id": "ac8f85c3-7d98-4b91-b51d-e5b3b8f8b8e1",
"name": "ComfyUI Webhook",
"type": "n8n-nodes-base.webhook",
"typeVersion": 1,
"position": [
240,
300
]
},
{
"parameters": {
"jsCode": "// Validate and prepare ComfyUI generation request\nconst input = $input.first().json;\n\n// Required parameters\nif (!input.prompt) {\n throw new Error('Prompt is required for image generation');\n}\n\n// Set defaults for optional parameters\nconst generationRequest = {\n prompt: input.prompt,\n negative_prompt: input.negative_prompt || '',\n width: input.width || 512,\n height: input.height || 512,\n steps: input.steps || 20,\n cfg: input.cfg || 7.0,\n checkpoint: input.checkpoint || 'v1-5-pruned-emaonly.safetensors',\n wait_for_completion: input.wait_for_completion !== false // Default to true\n};\n\n// Validate dimensions\nif (generationRequest.width < 64 || generationRequest.width > 2048) {\n throw new Error('Width must be between 64 and 2048 pixels');\n}\nif (generationRequest.height < 64 || generationRequest.height > 2048) {\n throw new Error('Height must be between 64 and 2048 pixels');\n}\n\n// Validate steps\nif (generationRequest.steps < 1 || generationRequest.steps > 150) {\n throw new Error('Steps must be between 1 and 150');\n}\n\n// Validate CFG\nif (generationRequest.cfg < 1 || generationRequest.cfg > 30) {\n throw new Error('CFG scale must be between 1 and 30');\n}\n\nreturn {\n generationRequest,\n originalInput: input,\n timestamp: new Date().toISOString()\n};"
},
"id": "bd9f86d4-8e09-5c02-c62e-f6c4c9f9c9f2",
"name": "Validate Request",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
460,
300
]
},
{
"parameters": {
"url": "http://backend:8000/comfyui/health",
"options": {
"response": {
"response": {
"responseFormat": "json"
}
}
}
},
"id": "ce0f97e5-9f10-6d13-d73f-g7d5d0g0d0g3",
"name": "Check ComfyUI Health",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.1,
"position": [
680,
300
]
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict"
},
"conditions": [
{
"id": "healthcheck-condition",
"leftValue": "={{ $json.status }}",
"rightValue": "healthy",
"operator": {
"type": "string",
"operation": "equals"
}
}
],
"combinator": "and"
},
"options": {}
},
"id": "df1f08f6-0f21-7e24-e84f-h8e6e1h1e1h4",
"name": "Health Check Branch",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
900,
300
]
},
{
"parameters": {
"url": "http://backend:8000/comfyui/generate",
"sendBody": true,
"bodyParameters": {
"parameters": [
{
"name": "prompt",
"value": "={{ $('Validate Request').item.json.generationRequest.prompt }}"
},
{
"name": "negative_prompt",
"value": "={{ $('Validate Request').item.json.generationRequest.negative_prompt }}"
},
{
"name": "width",
"value": "={{ $('Validate Request').item.json.generationRequest.width }}"
},
{
"name": "height",
"value": "={{ $('Validate Request').item.json.generationRequest.height }}"
},
{
"name": "steps",
"value": "={{ $('Validate Request').item.json.generationRequest.steps }}"
},
{
"name": "cfg",
"value": "={{ $('Validate Request').item.json.generationRequest.cfg }}"
},
{
"name": "checkpoint",
"value": "={{ $('Validate Request').item.json.generationRequest.checkpoint }}"
},
{
"name": "wait_for_completion",
"value": "={{ $('Validate Request').item.json.generationRequest.wait_for_completion }}"
}
]
},
"options": {
"response": {
"response": {
"responseFormat": "json"
}
}
}
},
"id": "ef2f19f7-1f32-8f35-f95f-i9f7f2i2f2i5",
"name": "Generate Image",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.1,
"position": [
1120,
240
]
},
{
"parameters": {
"jsCode": "// Process successful image generation result\nconst result = $input.first().json;\nconst originalRequest = $('Validate Request').item.json;\n\nif (!result.success) {\n throw new Error(`Image generation failed: ${result.error || 'Unknown error'}`);\n}\n\n// Extract generation info\nconst response = {\n success: true,\n prompt_id: result.prompt_id,\n client_id: result.client_id,\n message: result.message || 'Image generated successfully',\n generation_parameters: {\n prompt: originalRequest.generationRequest.prompt,\n negative_prompt: originalRequest.generationRequest.negative_prompt,\n width: originalRequest.generationRequest.width,\n height: originalRequest.generationRequest.height,\n steps: originalRequest.generationRequest.steps,\n cfg: originalRequest.generationRequest.cfg,\n checkpoint: originalRequest.generationRequest.checkpoint\n },\n outputs: result.data?.outputs || {},\n workflow_info: {\n execution_id: $execution.id,\n workflow_name: $workflow.name,\n completed_at: new Date().toISOString(),\n processing_time: Math.round((Date.now() - new Date(originalRequest.timestamp).getTime()) / 1000)\n }\n};\n\n// If outputs contain images, extract image information\nif (result.data?.outputs) {\n const imageFiles = [];\n for (const [nodeId, nodeOutput] of Object.entries(result.data.outputs)) {\n if (nodeOutput.images && Array.isArray(nodeOutput.images)) {\n for (const img of nodeOutput.images) {\n if (img.filename) {\n imageFiles.push({\n filename: img.filename,\n subfolder: img.subfolder || '',\n folder_type: img.folder_type || 'output',\n node_id: nodeId\n });\n }\n }\n }\n }\n response.generated_images = imageFiles;\n response.image_count = imageFiles.length;\n}\n\nreturn response;"
},
"id": "fg3f20g8-2g43-9g46-g06g-j0g8g3j3g3j6",
"name": "Process Success",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1340,
240
]
},
{
"parameters": {
"jsCode": "// Handle ComfyUI service unhealthy or error cases\nconst healthResponse = $input.first().json;\n\nconst errorResponse = {\n success: false,\n error: 'ComfyUI service is not available',\n details: {\n service_status: healthResponse.status || 'unknown',\n service_error: healthResponse.error,\n workflow_info: {\n execution_id: $execution.id,\n workflow_name: $workflow.name,\n failed_at: new Date().toISOString()\n }\n }\n};\n\nreturn errorResponse;"
},
"id": "gh4f31h9-3h54-0h57-h17h-k1h9h4k4h4k7",
"name": "Handle Service Error",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1120,
400
]
},
{
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}"
},
"id": "hi5f42i0-4i65-1i68-i28i-l2i0i5l5i5l8",
"name": "Success Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
1560,
240
]
},
{
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}"
},
"id": "ij6f53j1-5j76-2j79-j39j-m3j1j6m6j6m9",
"name": "Error Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
1340,
400
]
},
{
"parameters": {
"url": "http://backend:8000/comfyui/db/models?active_only=true&essential_only=false",
"options": {
"response": {
"response": {
"responseFormat": "json"
}
}
}
},
"id": "jk7f64k2-6k87-3k80-k40k-n4k2k7n7k7n0",
"name": "Get Available Models",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.1,
"position": [
240,
500
]
},
{
"parameters": {
"jsCode": "// Process available models for response\nconst modelsResponse = $input.first().json;\n\nif (!modelsResponse.success) {\n return {\n success: false,\n error: 'Failed to retrieve available models',\n models: []\n };\n}\n\nconst models = modelsResponse.models || [];\n\n// Group models by type\nconst modelsByType = {};\nmodels.forEach(model => {\n const type = model.type || 'unknown';\n if (!modelsByType[type]) {\n modelsByType[type] = [];\n }\n modelsByType[type].push({\n name: model.name,\n filename: model.filename,\n description: model.description,\n file_size_gb: model.file_size_gb,\n essential: model.essential || false\n });\n});\n\nreturn {\n success: true,\n total_models: models.length,\n models_by_type: modelsByType,\n models: models.map(m => ({\n name: m.name,\n type: m.type,\n filename: m.filename,\n essential: m.essential || false\n }))\n};"
},
"id": "kl8f75l3-7l98-4l91-l51l-o5l3l8o8l8o1",
"name": "Process Models",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
460,
500
]
},
{
"parameters": {
"respondWith": "json",
"responseBody": "={{ $json }}"
},
"id": "lm9f86m4-8m09-5m02-m62m-p6m4m9p9m9p2",
"name": "Models Response",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1,
"position": [
680,
500
]
}
],
"connections": {
"ComfyUI Webhook": {
"main": [
[
{
"node": "Validate Request",
"type": "main",
"index": 0
}
]
]
},
"Validate Request": {
"main": [
[
{
"node": "Check ComfyUI Health",
"type": "main",
"index": 0
}
]
]
},
"Check ComfyUI Health": {
"main": [
[
{
"node": "Health Check Branch",
"type": "main",
"index": 0
}
]
]
},
"Health Check Branch": {
"main": [
[
{
"node": "Generate Image",
"type": "main",
"index": 0
}
],
[
{
"node": "Handle Service Error",
"type": "main",
"index": 0
}
]
]
},
"Generate Image": {
"main": [
[
{
"node": "Process Success",
"type": "main",
"index": 0
}
]
]
},
"Process Success": {
"main": [
[
{
"node": "Success Response",
"type": "main",
"index": 0
}
]
]
},
"Handle Service Error": {
"main": [
[
{
"node": "Error Response",
"type": "main",
"index": 0
}
]
]
},
"Get Available Models": {
"main": [
[
{
"node": "Process Models",
"type": "main",
"index": 0
}
]
]
},
"Process Models": {
"main": [
[
{
"node": "Models Response",
"type": "main",
"index": 0
}
]
]
}
},
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "1.0.0",
"meta": {
"templateCredsSetupCompleted": true
},
"id": "comfyui-image-generation",
"tags": [
{
"createdAt": "2024-01-15T12:00:00.000Z",
"updatedAt": "2024-01-15T12:00:00.000Z",
"id": "comfyui",
"name": "ComfyUI"
},
{
"createdAt": "2024-01-15T12:00:00.000Z",
"updatedAt": "2024-01-15T12:00:00.000Z",
"id": "image-generation",
"name": "Image Generation"
}
]
}
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About this workflow
ComfyUI Image Generation Workflow. Uses httpRequest. Webhook trigger; 12 nodes.
Source: https://github.com/thekaveh/genai-vanilla/blob/main/services/n8n/workflows-stage/workflows/comfyui-image-generation.json — original creator credit. Request a take-down →
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