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 →
{
"nodes": [
{
"id": "a99b3164-fe36-4dde-9525-110c1ae08afb",
"name": "Convert raw to base64",
"type": "n8n-nodes-base.code",
"position": [
3320,
580
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "const encoded = Buffer.from($json.raw).toString('base64');\n\nreturn { encoded };"
},
"typeVersion": 2
},
{
"id": "f0f731bd-7b2f-4c39-bc06-42fd57bc4ae8",
"name": "Add email draft to thread",
"type": "n8n-nodes-base.httpRequest",
"position": [
3580,
580
],
"parameters": {
"url": "https://www.googleapis.com/gmail/v1/users/me/drafts",
"method": "POST",
"options": {},
"jsonBody": "={\"message\":{\"raw\":\"{{ $json.encoded }}\", \"threadId\": \"{{ $('Map fields for further processing').item.json[\"threadId\"] }}\"}}",
"sendBody": true,
"specifyBody": "json",
"authentication": "predefinedCredentialType",
"nodeCredentialType": "gmailOAuth2"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 4.1
},
{
"id": "c1ce3400-4582-46c7-a85d-8fa9c325ff7b",
"name": "Remove AI label from email",
"type": "n8n-nodes-base.gmail",
"position": [
3820,
580
],
"parameters": {
"resource": "thread",
"threadId": "={{ $('Map fields for further processing').item.json[\"threadId\"] }}",
"operation": "removeLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "65f0508a-ca2e-49ce-b02f-ef6505b5e983",
"name": "Schedule trigger (1 min)",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
960,
580
],
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 1
}
]
}
},
"typeVersion": 1.1
},
{
"id": "ca4a209b-a79d-4911-b69b-1db22808be60",
"name": "Map fields for further processing",
"type": "n8n-nodes-base.set",
"position": [
2620,
580
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "a77b2d79-1e70-410c-a657-f3d618154ea1",
"name": "response",
"type": "string",
"value": "={{ $json.output }}"
},
{
"id": "20850cac-f82c-4f02-84f0-3de31871a5b8",
"name": "threadId",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"threadId\"] }}"
},
{
"id": "d270c18e-39a0-4d87-85f0-cc1ffc9c10ff",
"name": "to",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"from\"][\"text\"] }}"
},
{
"id": "30acb50b-bdde-44bf-803c-76e0ae65f526",
"name": "subject",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"subject\"] }}"
},
{
"id": "88914536-8c25-4877-8914-feab5e32fae3",
"name": "messageId",
"type": "string",
"value": "={{ $('Get threads with specific labels').item.json[\"id\"] }}"
}
]
}
},
"typeVersion": 3.3
},
{
"id": "93eb3844-f1fe-4b09-bcae-3e372a19ab6f",
"name": "Convert response to HTML",
"type": "n8n-nodes-base.markdown",
"position": [
2860,
580
],
"parameters": {
"mode": "markdownToHtml",
"options": {
"simpleLineBreaks": false
},
"markdown": "={{ $json.response }}",
"destinationKey": "response"
},
"typeVersion": 1
},
{
"id": "da35eda9-b63e-49f9-8fe8-7517c1445c92",
"name": "Build email raw",
"type": "n8n-nodes-base.set",
"position": [
3100,
580
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "913e9cb1-10de-4637-bf48-40272c7c7fe3",
"name": "raw",
"type": "string",
"value": "=To: {{ $json.to }}\nSubject: {{ $json.subject }}\nContent-Type: text/html; charset=\"utf-8\"\n\n{{ $json.response }}"
}
]
}
},
"typeVersion": 3.3
},
{
"id": "b667a399-a178-42e3-a587-4eccd2a153d8",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
460,
460
],
"parameters": {
"color": 4,
"width": 420.4803040774015,
"height": 189.69151356225348,
"content": "## Reply draft with OpenAI Assistant\nThis workflow automatically transfers content of incoming email messages with specific labels into OpenAI Assitant and returns reply draft. After draft is composed, trigger label is deleted from the thread.\n\n**Please remember to configure your OpenAI Assistant first.**"
},
"typeVersion": 1
},
{
"id": "fe47636b-2142-4c40-a937-2ec360b230ae",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
900,
460
],
"parameters": {
"width": 451.41125086385614,
"height": 313.3056033573073,
"content": "### Schedule trigger and get emails\nRun the workflow in equal intervals and check for threads with specific labels (trigger labels)."
},
"typeVersion": 1
},
{
"id": "c9bfa42c-a045-404d-aebe-d87dceb68f1a",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
460,
680
],
"parameters": {
"color": 3,
"width": 421.0932411886662,
"height": 257.42916378714597,
"content": "## \u26a0\ufe0f Note\n\n1. Complete video guide for this workflow is available [on my YouTube](https://youtu.be/a8Dhj3Zh9vQ). \n2. Remember to add your credentials and configure nodes (covered in the video guide).\n3. If you like this workflow, please subscribe to [my YouTube channel](https://www.youtube.com/@workfloows) and/or [my newsletter](https://workfloows.com/).\n\n**Thank you for your support!**"
},
"typeVersion": 1
},
{
"id": "40424340-c0ec-435a-9ce0-0e0dc3b94cfc",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
2160,
460
],
"parameters": {
"width": 381.6458068293894,
"height": 313.7892229150129,
"content": "### Generate reply\nTransfer email content to OpenAI Assitant and return AI-generated reply.\n"
},
"typeVersion": 1
},
{
"id": "e7cce507-6658-414d-8cbc-3af847dad124",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
2800,
460
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Create HTML message\nConvert incoming Markdown from OpenAI Assistant into HTML content."
},
"typeVersion": 1
},
{
"id": "2b383967-0a23-46a1-9a19-a9532a3c3425",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
3040,
460
],
"parameters": {
"width": 461.3148409669012,
"height": 314.75072291501283,
"content": "### Build and encode message\nCreate raw message in RFC standard and encode it into base64 string (please see [Gmail API reference](https://developers.google.com/gmail/api/reference/rest/v1/users.drafts/create) for more details)."
},
"typeVersion": 1
},
{
"id": "07685b17-cf22-4adf-a6b7-7acc2d863115",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"position": [
3520,
460
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Insert reply draft\nAdd reply draft from OpenAI Assistant to specific Gmail thread."
},
"typeVersion": 1
},
{
"id": "1e8109f8-7dd3-4308-a5e8-32382aa41805",
"name": "Sticky Note9",
"type": "n8n-nodes-base.stickyNote",
"position": [
3760,
460
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Remove label\nDelete trigger label from the Gmail thread."
},
"typeVersion": 1
},
{
"id": "d488db90-7367-49fa-b366-ccdfc796b5b3",
"name": "Get threads with specific labels",
"type": "n8n-nodes-base.gmail",
"position": [
1180,
580
],
"parameters": {
"filters": {
"labelIds": []
},
"resource": "thread",
"returnAll": true
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "9f5262c5-d319-4a9d-af6e-aa42970d1a6f",
"name": "Ask OpenAI Assistant",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
2220,
580
],
"parameters": {
"text": "={{ $json.text }}",
"prompt": "define",
"options": {},
"resource": "assistant",
"assistantId": {
"__rl": true,
"mode": "list",
"value": "asst_kmKeAtwF2rv0vgF0ujY4jlp6",
"cachedResultName": "Customer assistant"
}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "6ffd7d66-40b6-49a4-9e15-9742bda73d2f",
"name": "Loop over threads",
"type": "n8n-nodes-base.splitInBatches",
"position": [
1440,
580
],
"parameters": {
"options": {}
},
"typeVersion": 3
},
{
"id": "8afc47c8-075f-4f3d-a89d-fda81fc270fc",
"name": "Get thread messages",
"type": "n8n-nodes-base.gmail",
"position": [
1700,
820
],
"parameters": {
"options": {
"returnOnlyMessages": true
},
"resource": "thread",
"threadId": "={{ $json.id }}",
"operation": "get"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "2286bfa7-dcb8-4a61-a71b-ea58e21bf7ab",
"name": "Return last message in thread",
"type": "n8n-nodes-base.limit",
"position": [
1920,
820
],
"parameters": {
"keep": "lastItems"
},
"typeVersion": 1
},
{
"id": "44c52e61-dd88-4499-85db-69ce4704c2b2",
"name": "Get single message content",
"type": "n8n-nodes-base.gmail",
"position": [
1700,
460
],
"parameters": {
"simple": false,
"options": {},
"messageId": "={{ $json.id }}",
"operation": "get"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "7ca62611-f02e-47bf-b940-3a56ece443b7",
"name": "Sticky Note10",
"type": "n8n-nodes-base.stickyNote",
"position": [
1640,
340
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Return message content\nRetrieve content of the last message in the thread."
},
"typeVersion": 1
},
{
"id": "165df2a4-3c94-456d-9906-be8020098802",
"name": "Sticky Note11",
"type": "n8n-nodes-base.stickyNote",
"position": [
1640,
680
],
"parameters": {
"width": 470.88389496558545,
"height": 314.75072291501283,
"content": "### Get last message from thread\nReturn all messages for a single thread and pass for further processing only the last one."
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"connections": {
"Build email raw": {
"main": [
[
{
"node": "Convert raw to base64",
"type": "main",
"index": 0
}
]
]
},
"Loop over threads": {
"main": [
[
{
"node": "Get single message content",
"type": "main",
"index": 0
}
],
[
{
"node": "Get thread messages",
"type": "main",
"index": 0
}
]
]
},
"Get thread messages": {
"main": [
[
{
"node": "Return last message in thread",
"type": "main",
"index": 0
}
]
]
},
"Ask OpenAI Assistant": {
"main": [
[
{
"node": "Map fields for further processing",
"type": "main",
"index": 0
}
]
]
},
"Convert raw to base64": {
"main": [
[
{
"node": "Add email draft to thread",
"type": "main",
"index": 0
}
]
]
},
"Convert response to HTML": {
"main": [
[
{
"node": "Build email raw",
"type": "main",
"index": 0
}
]
]
},
"Schedule trigger (1 min)": {
"main": [
[
{
"node": "Get threads with specific labels",
"type": "main",
"index": 0
}
]
]
},
"Add email draft to thread": {
"main": [
[
{
"node": "Remove AI label from email",
"type": "main",
"index": 0
}
]
]
},
"Get single message content": {
"main": [
[
{
"node": "Ask OpenAI Assistant",
"type": "main",
"index": 0
}
]
]
},
"Return last message in thread": {
"main": [
[
{
"node": "Loop over threads",
"type": "main",
"index": 0
}
]
]
},
"Get threads with specific labels": {
"main": [
[
{
"node": "Loop over threads",
"type": "main",
"index": 0
}
]
]
},
"Map fields for further processing": {
"main": [
[
{
"node": "Convert response to HTML",
"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.
gmailOAuth2openAiApi
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
How this works
This workflow automates the management of code-related emails by scanning your Gmail inbox on a schedule, removing AI-generated labels from relevant threads, and drafting polished responses using OpenAI to refine your input. It's ideal for developers and technical writers who receive frequent code review requests or queries and want to ensure timely, high-quality replies without constant manual intervention. The key step involves the OpenAI integration to generate and format responses, which are then converted to HTML and inserted as email drafts directly into the original thread via HTTP requests.
Use this workflow when handling a steady volume of code-focused emails that require AI-assisted drafting, such as in collaborative projects or support roles, to save hours on routine correspondence. Avoid it for non-technical inboxes or when immediate real-time responses are needed, as the cron-based scheduling introduces a slight delay. Common variations include adjusting the trigger interval for busier inboxes or integrating additional tools like Slack notifications for urgent threads.
About this workflow
Limit Code. Uses httpRequest, gmail, scheduleTrigger, markdown. Scheduled trigger; 23 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →
Related workflows
Workflows that share integrations, category, or trigger type with this one. All free to copy and import.
Stop finding out you're out of stock after a customer already tried to buy. This workflow monitors your entire product inventory daily, calculates how fast each SKU is selling, and automatically raise
Google Sheets, HTTP Request, Gmail +1
Limit Code. Uses stickyNote, gmail, httpRequest, markdown. Scheduled trigger; 23 nodes.
Gmail, HTTP Request, OpenAI
The scoreboard shows you what happened. This workflow tells you why it happened. Every time an IPL match ends this automation detects the completed result, fetches the full scorecard, and sends it to
Google Sheets, HTTP Request, OpenAI +1
Wait Splitout. Uses gmail, httpRequest, splitOut, html. Scheduled trigger; 21 nodes.
Gmail, HTTP Request, OpenAI
Wait Splitout. Uses gmail, httpRequest, splitOut, html. Scheduled trigger; 21 nodes.
Gmail, HTTP Request, OpenAI