n8nでワークフローをWebhook経由で作成
中級
これはEngineering分野の自動化ワークフローで、11個のノードを含みます。主にIf, Set, Code, Webhook, HttpRequestなどのノードを使用。 Webhookとn8n APIを使ってプログラムのに動のなワークフローを作成
前提条件
- •HTTP Webhookエンドポイント（n8nが自動生成）
- •ターゲットAPIの認証情報が必要な場合あり
使用ノード (11)
カテゴリー
ワークフロープレビュー
ノード接続関係を可視化、ズームとパンをサポート
ワークフローをエクスポート
以下のJSON設定をn8nにインポートして、このワークフローを使用できます
{
"id": "mchujUnGa9RKf7dO",
"meta": {
"instanceId": "6f30db2c3fce1d1703bcd68e01088879e38bc7981b202c52c370fb8fb136ded4",
"templateCredsSetupCompleted": true
},
"name": "Create Workflow via Webhook in n8n",
"tags": [],
"nodes": [
{
"id": "41cfbc58-c8d5-4a22-aec1-72a4b7db3d63",
"name": "付箋4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-2360,
-2100
],
"parameters": {
"width": 720,
"height": 500,
"content": "1. **Webhook**: it receives a POST at `/webhook/create-workflow` with the workflow JSON.\n2. **Validate JSON**: it runs code that checks the JSON has the fields `name` and `nodes`, and that each node has `id`, `name`, `type`, and `position`. It returns `{ success: true }` if everything is valid, or `{ success: false, message: \"…\" }` if there’s an error.\n3. **Validation Successful?**: it looks at the result from “Validate JSON” and, depending on whether `success` is `true` or `false`, decides to continue creating the workflow or return the error.\n"
},
"typeVersion": 1
},
{
"id": "62c4a402-1397-4aad-82de-c38672a382a7",
"name": "付箋6",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1600,
-1740
],
"parameters": {
"color": 3,
"width": 820,
"height": 360,
"content": "1. **Validation Error**: Sets a JSON response with `success: false` and uses the incoming `$json.message` as the error message when the initial payload validation fails.\n\n2. **API Error**: Sets a JSON response with `success: false`, a fixed `message: \"Error creating workflow\"`, includes the full error payload (`error: JSON.stringify($json)`), and the HTTP `statusCode` from the failed API request.\n"
},
"typeVersion": 1
},
{
"id": "df771acf-ef37-49f9-8a9f-ec60fd955d86",
"name": "付箋7",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1520,
-2320
],
"parameters": {
"width": 720,
"height": 500,
"content": "1. **Create Workflow**: Sends a POST to `/api/v1/workflows` with the validated workflow payload, using header-based authentication.\n2. **API Successful?**: Checks if the HTTP response status code is ≤ 299.\n3. **Success Response**: If the API call succeeded, constructs the final JSON with `success: true`, `workflowId`, `workflowName`, `createdAt`, and the workflow `url`.\n"
},
"typeVersion": 1
},
{
"id": "c798d2a9-577d-4f46-b269-ca2b4447560c",
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-2280,
-1880
],
"webhookId": "baad3add-f74a-447a-9764-75967674fa9f",
"parameters": {
"path": "create-workflow",
"options": {},
"httpMethod": "POST",
"responseMode": "lastNode"
},
"notesInFlow": false,
"typeVersion": 1
},
{
"id": "3ca95b00-83b2-4f75-874f-43a27e298bf1",
"name": "JSONの検証",
"type": "n8n-nodes-base.code",
"position": [
-2060,
-1880
],
"parameters": {
"jsCode": "// Validate the received JSON\nconst payload = $input.item.json.body;\n\n// Check that required fields exist\nif (!payload) {\n return {\n json: {\n success: false,\n message: \"No payload received in the request\"\n }\n };\n}\n\n// Ensure correct format for a workflow\nconst requiredFields = ['name', 'nodes'];\nfor (const field of requiredFields) {\n if (!payload[field]) {\n return {\n json: {\n success: false,\n message: `The field '${field}' is required in the workflow`\n }\n };\n }\n}\n\n// Ensure connections and settings exist\nif (!payload.connections) payload.connections = {};\nif (!payload.settings) payload.settings = {};\n\n// Verify that there is at least one node\nif (!Array.isArray(payload.nodes) || payload.nodes.length === 0) {\n return {\n json: {\n success: false,\n message: \"The workflow must have at least one node\"\n }\n };\n}\n\n// Validate each node's required fields\nfor (const node of payload.nodes) {\n const nodeRequiredFields = ['id', 'name', 'type', 'position'];\n for (const field of nodeRequiredFields) {\n if (!node[field]) {\n return {\n json: {\n success: false,\n message: `Node '${node.name || 'unknown'}' is missing required field '${field}'`\n }\n };\n }\n }\n \n // Ensure parameters exists\n if (!node.parameters) node.parameters = {};\n if (!node.typeVersion) node.typeVersion = 1;\n}\n\n// Prepare the workflow object for the API\nconst apiWorkflow = {\n name: payload.name,\n nodes: payload.nodes,\n connections: payload.connections,\n settings: payload.settings\n};\n\n// If everything is valid, proceed\nreturn {\n json: {\n success: true,\n apiWorkflow: apiWorkflow\n }\n};"
},
"typeVersion": 1
},
{
"id": "b3894755-0583-4c00-b574-e993a6f0b08f",
"name": "検証成功？",
"type": "n8n-nodes-base.if",
"position": [
-1840,
-1880
],
"parameters": {
"conditions": {
"boolean": [
{
"value1": "={{ $json.success }}",
"value2": true
}
]
}
},
"typeVersion": 1
},
{
"id": "ef3a310b-7673-40cc-985a-4e87dc99de70",
"name": "ワークフロー作成",
"type": "n8n-nodes-base.httpRequest",
"position": [
-1440,
-2080
],
"parameters": {
"url": "=http://{{ $('Webhook').item.json.headers.host }}/api/v1/workflows",
"options": {},
"authentication": "headerAuth"
},
"credentials": {
"httpHeaderAuth": {
"id": "TS0ZOhjrOm9oUaWR",
"name": "N8N"
}
},
"typeVersion": 1,
"continueOnFail": true
},
{
"id": "7e2c1a11-1d4c-4075-a03c-f6ed93307d19",
"name": "API成功？",
"type": "n8n-nodes-base.if",
"position": [
-1220,
-2080
],
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $response.statusCode }}",
"value2": 299,
"operation": "smallerEqual"
}
]
}
},
"typeVersion": 1
},
{
"id": "0371ce73-ccb6-4e87-8620-4aab8529b170",
"name": "成功レスポンス",
"type": "n8n-nodes-base.set",
"position": [
-960,
-2180
],
"parameters": {
"values": {
"string": [
{
"name": "success",
"value": "true"
},
{
"name": "message",
"value": "Workflow created successfully"
},
{
"name": "workflowId",
"value": "={{ $json.data[0].id }}"
},
{
"name": "workflowName",
"value": "={{ $json.data[0].name }}"
},
{
"name": "createdAt",
"value": "={{ $json.data[0].createdAt }}"
},
{
"name": "url",
"value": "=http://localhost:5678/workflow/{{ $json.data[0].id }}"
}
]
},
"options": {}
},
"typeVersion": 1
},
{
"id": "daec93d7-b9d8-4407-93ab-389b705b0c11",
"name": "検証エラー",
"type": "n8n-nodes-base.set",
"position": [
-1500,
-1540
],
"parameters": {
"values": {
"string": [
{
"name": "success",
"value": "false"
},
{
"name": "message",
"value": "={{ $json.message }}"
}
]
},
"options": {}
},
"typeVersion": 1
},
{
"id": "cd2cd403-63c2-42af-a715-9f080067f7d1",
"name": "APIエラー",
"type": "n8n-nodes-base.set",
"position": [
-920,
-1540
],
"parameters": {
"values": {
"string": [
{
"name": "success",
"value": "false"
},
{
"name": "message",
"value": "Error creating workflow"
},
{
"name": "error",
"value": "={{ JSON.stringify($json) }}"
},
{
"name": "statusCode",
"value": "={{ $response.statusCode }}"
}
]
},
"options": {}
},
"typeVersion": 1
}
],
"active": true,
"pinData": {
"Webhook": [
{
"json": {
"body": {
"name": "Workflow Created by ID mchujUnGa9RKf7dO",
"nodes": [
{
"id": "start-node",
"name": "Start",
"type": "n8n-nodes-base.manualTrigger",
"position": [
100,
100
],
"parameters": {},
"typeVersion": 1
},
{
"id": "set-node",
"name": "Set",
"type": "n8n-nodes-base.set",
"position": [
300,
100
],
"parameters": {
"values": {
"string": [
{
"name": "message",
"value": "This workflow was created using the webhook in mchujUnGa9RKf7dO!"
}
]
}
},
"typeVersion": 1
}
],
"settings": {},
"connections": {
"Start": {
"main": [
[
{
"node": "Set",
"type": "main",
"index": 0
}
]
]
}
}
},
"query": {},
"params": {},
"headers": {
"host": "127.0.0.1:5678",
"connection": "keep-alive",
"content-type": "application/json",
"transfer-encoding": "chunked"
},
"webhookUrl": "http://localhost:5678/webhook/create-workflow",
"executionMode": "production"
}
}
]
},
"settings": {
"executionOrder": "v1"
},
"versionId": "849462be-761a-455e-a99b-ffe52b2249d7",
"connections": {
"c798d2a9-577d-4f46-b269-ca2b4447560c": {
"main": [
[
{
"node": "3ca95b00-83b2-4f75-874f-43a27e298bf1",
"type": "main",
"index": 0
}
]
]
},
"3ca95b00-83b2-4f75-874f-43a27e298bf1": {
"main": [
[
{
"node": "b3894755-0583-4c00-b574-e993a6f0b08f",
"type": "main",
"index": 0
}
]
]
},
"7e2c1a11-1d4c-4075-a03c-f6ed93307d19": {
"main": [
[
{
"node": "0371ce73-ccb6-4e87-8620-4aab8529b170",
"type": "main",
"index": 0
}
],
[
{
"node": "cd2cd403-63c2-42af-a715-9f080067f7d1",
"type": "main",
"index": 0
}
]
]
},
"ef3a310b-7673-40cc-985a-4e87dc99de70": {
"main": [
[
{
"node": "7e2c1a11-1d4c-4075-a03c-f6ed93307d19",
"type": "main",
"index": 0
}
]
]
},
"b3894755-0583-4c00-b574-e993a6f0b08f": {
"main": [
[
{
"node": "ef3a310b-7673-40cc-985a-4e87dc99de70",
"type": "main",
"index": 0
}
],
[
{
"node": "daec93d7-b9d8-4407-93ab-389b705b0c11",
"type": "main",
"index": 0
}
]
]
}
}
}よくある質問
このワークフローの使い方は？
上記のJSON設定コードをコピーし、n8nインスタンスで新しいワークフローを作成して「JSONからインポート」を選択、設定を貼り付けて認証情報を必要に応じて変更してください。
このワークフローはどんな場面に適していますか？
中級 - エンジニアリング
有料ですか？
このワークフローは完全無料です。ただし、ワークフローで使用するサードパーティサービス（OpenAI APIなど）は別途料金が発生する場合があります。
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ワークフロー情報
難易度
中級
ノード数11
カテゴリー1
ノードタイプ6
作成者
Mauricio Perera
@rckflrAutomation consultant with over 10 years of experience specializing in AI, no-code, and workflow optimization. I’ve delivered tailored AI and NLP solutions across real estate, healthcare, and more, enhancing efficiency and customer experiences. Proficient in tools like Make, Airtable, and Zapier, I also integrate GPT models to create scalable, innovative automations. Contact me to discuss custom n8n workflows or advanced automations to streamline your processes.
外部リンク
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