WeblineIndia 
This workflow corresponds to n8n.io template #15123 — we link there as the canonical source.
This workflow follows the Gmail → 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 →
{
"id": "ABpNEZh2zrFMu9yj",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "API Mock Auto-Refresh",
"tags": [],
"nodes": [
{
"id": "b07ce725-2040-4454-83e1-6e072f23a6a5",
"name": "Sticky Note - How It Works",
"type": "n8n-nodes-base.stickyNote",
"position": [
-880,
-64
],
"parameters": {
"width": 452,
"height": 1028,
"content": "## How It Works\n\n\nThis process handles the full lifecycle of an OpenAPI spec update \u2014 from GitHub push to Postman mock refresh, spec comparison, PR comment and team notification.\n\nWhen a push lands on `develop`, the **GitHub Webhook** fires \u2192 config is loaded \u2192 **Postman mock is refreshed** \u2192 old and new specs are downloaded. GitHub Actions runs `openapi-diff` and POSTs the result back to the **Webhook OpenAPI-diff** node. If differences are found, they are parsed and cleaned, then **posted as a PR comment** and **emailed to the team**.\n\n\n---\n\n## Setup Steps\n\n1. **Import** this workflow JSON into your n8n instance.\n\n2. **Open `Set: Config`** and update:\n - `postman.apiKey` \u2014 your Postman API key\n - `postman.mockId` \u2014 your Postman Mock Server ID\n - `github.repo` \u2014 your GitHub repo (format: `owner/repo`)\n - `github.token` \u2014 a GitHub Personal Access Token with `repo` scope\n - `github.prId` \u2014 the Pull Request ID to comment on\n\n3. **Configure your GitHub Webhook** to point to `/webhook/api-update` on the `develop` branch.\n\n4. **Connect your Gmail account** in the `Send Summary Email1` node.\n\n5. **Connect your GitHub credentials** in the `Comment to PR` node (Header Auth PR).\n\n6. **Set up openapi-diff** via Docker in GitHub Actions and configure it to POST results to `/webhook/api-diff-result`.\n\n7. **Activate the workflow** and test by pushing a spec change to `develop`.\n\n Never commit real API keys or tokens to source control \u2014 use n8n credentials instead."
},
"typeVersion": 1
},
{
"id": "63156d49-3bcc-475d-8809-05b9a1547a44",
"name": "Sticky Note - GitHub Webhook",
"type": "n8n-nodes-base.stickyNote",
"position": [
-320,
-64
],
"parameters": {
"width": 432,
"height": 348,
"content": "###GitHub Webhook\n**Trigger \u2014 Entry Point**\n\nListens for `POST` requests at `/webhook/api-update`.\n\nFired by GitHub when a push or PR event occurs on the `develop` branch. Payload includes repo name, branch and PR details.\n\nConfigure this URL in your GitHub repo under **Settings \u2192 Webhooks**."
},
"typeVersion": 1
},
{
"id": "38b57660-1662-44b7-8639-1a1c4e1f13c4",
"name": "Sticky Note - Set Config",
"type": "n8n-nodes-base.stickyNote",
"position": [
144,
-64
],
"parameters": {
"height": 220,
"content": "### Set: Config\n**Load All Configuration**\n\n\n\n"
},
"typeVersion": 1
},
{
"id": "2077eb11-904a-4abc-a2d2-2cf72b8e88a1",
"name": "Sticky Note - Update Postman",
"type": "n8n-nodes-base.stickyNote",
"position": [
432,
-80
],
"parameters": {
"width": 304,
"height": 348,
"content": "### Update Postman Mock\n**Refresh Mock Server**\n\nCalls the Postman API to refresh the mock server using the configured `mockId`.\n\n\n\n"
},
"typeVersion": 1
},
{
"id": "a9c82976-2b99-45c9-aefc-cd480c9fa5e9",
"name": "Sticky Note - Old Spec",
"type": "n8n-nodes-base.stickyNote",
"position": [
800,
-64
],
"parameters": {
"width": 320,
"height": 376,
"content": "### Download OLD OpenAPI Spec\n**Fetch Baseline Spec**\n\nDownloads `openapi_old.yaml` from the `develop` branch of the GitHub repo via raw URL.\n\nThis is the **previous version** of the API spec \u2014 used as the baseline for comparison by `openapi-diff`."
},
"typeVersion": 1
},
{
"id": "3c7cde90-d2a5-408e-bd7a-02536d63a352",
"name": "Sticky Note - New Spec",
"type": "n8n-nodes-base.stickyNote",
"position": [
1152,
-32
],
"parameters": {
"width": 416,
"height": 428,
"content": "### Download NEW OpenAPI Spec\n**Fetch Updated Spec**\n\nDownloads `openapi_new.yaml` from the `develop` branch of the GitHub repo via raw URL.\n\nThis is the **latest version** of the API spec \u2014 compared against the old spec to detect breaking changes.\n\nAfter this, GitHub Actions runs `openapi-diff` (Docker) and POSTs the result back."
},
"typeVersion": 1
},
{
"id": "ed807808-15e5-4c7e-81eb-cf8aee375f46",
"name": "Sticky Note - Diff Webhook",
"type": "n8n-nodes-base.stickyNote",
"position": [
-368,
352
],
"parameters": {
"width": 368,
"height": 294,
"content": "### Webhook OpenAPI-diff\n**Receive Diff Result**\n\nA second webhook at `/webhook/api-diff-result` that receives the result POSTed back by GitHub Actions after running `openapi-diff` via Docker.\n\n"
},
"typeVersion": 1
},
{
"id": "c55a54de-86f2-495a-aafb-a8669851e39c",
"name": "Sticky Note - Check Empty",
"type": "n8n-nodes-base.stickyNote",
"position": [
96,
304
],
"parameters": {
"width": 352,
"height": 322,
"content": "### Check If Data Is Not Empty\n**Guard Clause**\n\nChecks whether the `diff` field in the incoming payload is non-empty.\n\n**True** \u2192 Proceed to parse diff and notify\n**False** \u2192 Route to Stop and Error\n\n"
},
"typeVersion": 1
},
{
"id": "69e097c7-b5ff-4bdc-8f64-54f94764d3d1",
"name": "Sticky Note - Stop Error",
"type": "n8n-nodes-base.stickyNote",
"position": [
-176,
752
],
"parameters": {
"width": 528,
"height": 248,
"content": " Stop and Error\n**Halt \u2014 No Changes Detected**\n\nTerminates the execution with the message:\n> *\"No difference is available\"*\n\n\n\n"
},
"typeVersion": 1
},
{
"id": "3dcd2e01-97ec-46ae-8f6b-7f1bd4890bde",
"name": "Sticky Note - Get Fields",
"type": "n8n-nodes-base.stickyNote",
"position": [
480,
464
],
"parameters": {
"width": 320,
"height": 454,
"content": "### Get Fields\n**Parse & Clean Diff Data**\n\nExtracts and sanitizes fields from the webhook body:\n- `owner` \u2014 first part of `repo` string\n- `repo` \u2014 second part of `repo` string\n- `pr` \u2014 Pull Request ID\n- `diff` \u2014 removes `=====` and `-----` separator lines, strips extra blank lines and trims whitespace\n\nOutput is clean Markdown-ready text."
},
"typeVersion": 1
},
{
"id": "2206905e-558a-47f8-9636-306250187dd7",
"name": "Sticky Note - Comment PR",
"type": "n8n-nodes-base.stickyNote",
"position": [
832,
448
],
"parameters": {
"width": 336,
"height": 486,
"content": "### Comment to PR\n**Post Diff to GitHub PR**\n\nCalls the GitHub REST API to post the cleaned diff as a comment on the Pull Request.\n\nEndpoint:\n`POST /repos/{owner}/{repo}/issues/{pr}/comments`\n\nThe comment is formatted under the heading:\n`### OpenAPI Diff Result`\n\nUses `Header Auth PR` credential."
},
"typeVersion": 1
},
{
"id": "ccd00b87-c68f-4e21-a945-191ca4245701",
"name": "Sticky Note - Email",
"type": "n8n-nodes-base.stickyNote",
"position": [
1264,
448
],
"parameters": {
"width": 352,
"height": 454,
"content": "### Send Summary Email1\n**Notify Team via Gmail**\n\nSends a rich HTML email to the team with:\n- Repository name and owner\n- Pull Request number\n- Full diff output (in `<pre>` block)\n- Direct link to the PR on GitHub\n\n Update `sendTo` with your team's email address.\n Uses Gmail OAuth2 credential."
},
"typeVersion": 1
},
{
"id": "e4fc1822-f992-428b-acf7-73167f479e70",
"name": "Update Postman Mock",
"type": "n8n-nodes-base.httpRequest",
"position": [
544,
80
],
"parameters": {
"url": "=https://api.getpostman.com/mocks/{{ $json.postman.mockId }}",
"options": {},
"authentication": "headerAuth"
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "5a20f6f9-e559-47ed-80ff-b1167b51a255",
"name": "Comment to PR",
"type": "n8n-nodes-base.httpRequest",
"position": [
944,
784
],
"parameters": {
"url": "=https://api.github.com/repos/{{ $json.owner }}/{{ $json.repo }}/issues/{{ $json.pr }}/comments",
"options": {},
"requestMethod": "POST",
"authentication": "headerAuth",
"jsonParameters": true,
"bodyParametersJson": "={{ JSON.stringify({\n body: \"### OpenAPI Diff Result\\n\\n\" + $json.diff\n}) }}",
"headerParametersJson": "={\n \"Accept\": \"application/vnd.github+json\",\n \"Content-Type\": \"application/json\"\n}"
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "405025f2-718c-408e-b289-c12197b4adc9",
"name": "Set: Config",
"type": "n8n-nodes-base.set",
"position": [
208,
16
],
"parameters": {
"values": {
"string": [
{
"name": "postman.apiKey",
"value": "PMAK-69ae6adcaa02a000013daf43-01b4c0b7b6809dac30e2f3434f68b839fb"
},
{
"name": "postman.mockId",
"value": "26cc4d4b-9b09-4bdf-86e2-2c4c411197fe"
},
{
"name": "github.repo",
"value": "https://github.com/learning-n8n/n8n-test.git"
},
{
"name": "github.token",
"value": "github_patYOUR_AIRTABLE_TOKEN_HERE"
},
{
"name": "github.prId",
"value": "1"
}
]
},
"options": {}
},
"typeVersion": 1
},
{
"id": "357d92eb-a68d-4f84-9a48-08a4cf33cbbf",
"name": "GitHub Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-160,
144
],
"parameters": {
"path": "api-update",
"options": {},
"httpMethod": "POST"
},
"typeVersion": 1
},
{
"id": "30d765be-440b-4df3-bafc-d22c0990fae9",
"name": "Download OLD OpenAPI Spec",
"type": "n8n-nodes-base.httpRequest",
"position": [
912,
144
],
"parameters": {
"url": "=https://raw.githubusercontent.com/learning-n8n/n8n-test/develop/openapi_specs/openapi_old.yaml",
"options": {}
},
"typeVersion": 4.4
},
{
"id": "ce0c80c5-15a6-4959-a6b4-4501159ab10d",
"name": "Download NEW OpenAPI Spec",
"type": "n8n-nodes-base.httpRequest",
"position": [
1312,
208
],
"parameters": {
"url": "=https://raw.githubusercontent.com/learning-n8n/n8n-test/develop/openapi_specs/openapi_new.yaml\n",
"options": {}
},
"typeVersion": 4.4
},
{
"id": "a3a8fddd-5fca-4204-9c5c-0b0657f72a47",
"name": "Webhook OpenAPI-diff",
"type": "n8n-nodes-base.webhook",
"position": [
-240,
496
],
"parameters": {
"path": "api-diff-result",
"options": {},
"httpMethod": "POST"
},
"typeVersion": 2.1
},
{
"id": "784fd60f-69cf-463a-9c6e-1a3665d3b5ee",
"name": "Stop and Error",
"type": "n8n-nodes-base.stopAndError",
"position": [
32,
864
],
"parameters": {
"errorMessage": "No difference is available"
},
"typeVersion": 1
},
{
"id": "bfd686d0-7c19-424c-a708-000d59a15508",
"name": "Get Fields",
"type": "n8n-nodes-base.set",
"position": [
592,
768
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "de0bfceb-e44e-418a-acd1-ef9fc11e0aba",
"name": "=owner",
"type": "string",
"value": "={{ $json.body.repo.split(\"/\")[0] }}"
},
{
"id": "b6f253c9-b75b-42ac-8b74-d2982f4eaef5",
"name": "repo",
"type": "string",
"value": "={{ $json.body.repo.split(\"/\")[1] }}"
},
{
"id": "c0a887ad-4ab9-48f4-b3f4-ab730f0ca903",
"name": "pr",
"type": "string",
"value": "={{ $json.body.pr }}"
},
{
"id": "a70fcc61-36e6-4b2c-88a8-c7775f546ea7",
"name": "diff",
"type": "string",
"value": "={{\n$json.body.diff\n.replace(/^[=\\-]{5,}.*$/gm,'') // remove ===== and ---- lines\n.replace(/\\n{2,}/g,'\\n') // remove extra blank lines\n.trim()\n}}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "f61c3a4d-4303-4184-a1f0-f613289b317f",
"name": "Check If data is not empty",
"type": "n8n-nodes-base.if",
"position": [
224,
480
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 3,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "f70e48ee-d113-408a-a8b8-221487403489",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{$json.body.diff}}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.3
},
{
"id": "ceebd209-58f9-478b-9d4d-5b21d01e14d1",
"name": "Send Summary Email1",
"type": "n8n-nodes-base.gmail",
"position": [
1376,
736
],
"parameters": {
"sendTo": "user@example.com",
"message": "=<h2>OpenAPI Diff Result</h2>\n\n<p><b>Repository:</b> {{ $('Get Fields').item.json.owner }}/{{ $('Get Fields').item.json.repo }} </p>\n<p><b>Pull Request:</b> #{{ $('Get Fields').item.json.pr }} </p>\n\n<pre>{{ $('Get Fields').item.json.diff }} </pre>\n\n<p>PR Link:</p>\n<a href=\"https://github.com/{{ $('Get Fields').item.json.owner }}/{{ $('Get Fields').item.json.repo }}/pull/{{ $('Get Fields').item.json.pr }}\">\nView Pull Request\n</a>",
"options": {},
"subject": "=OpenAPI Diff Result for PR #{{ $('Get Fields').item.json.pr }}"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.2
}
],
"active": false,
"settings": {
"binaryMode": "separate",
"availableInMCP": false,
"executionOrder": "v1"
},
"versionId": "6d9a8172-b05a-456f-90e1-661f0e41ff24",
"connections": {
"Get Fields": {
"main": [
[
{
"node": "Comment to PR",
"type": "main",
"index": 0
}
]
]
},
"Set: Config": {
"main": [
[
{
"node": "Update Postman Mock",
"type": "main",
"index": 0
}
]
]
},
"Comment to PR": {
"main": [
[
{
"node": "Send Summary Email1",
"type": "main",
"index": 0
}
]
]
},
"GitHub Webhook": {
"main": [
[
{
"node": "Set: Config",
"type": "main",
"index": 0
}
]
]
},
"Update Postman Mock": {
"main": [
[
{
"node": "Download OLD OpenAPI Spec",
"type": "main",
"index": 0
}
]
]
},
"Webhook OpenAPI-diff": {
"main": [
[
{
"node": "Check If data is not empty",
"type": "main",
"index": 0
}
]
]
},
"Download OLD OpenAPI Spec": {
"main": [
[
{
"node": "Download NEW OpenAPI Spec",
"type": "main",
"index": 0
}
]
]
},
"Check If data is not empty": {
"main": [
[
{
"node": "Get Fields",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 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.
gmailOAuth2httpHeaderAuth
Pro
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About this workflow
This n8n workflow automates the full API specification update lifecycle whenever changes are pushed to GitHub. It refreshes a Postman mock server, downloads the old and new OpenAPI specs, compares them using , then posts detected API changes directly to the GitHub Pull Request…
Source: https://n8n.io/workflows/15123/ — original creator credit. Request a take-down →
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