This workflow follows the Chainllm → 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": "LLM Code Review in GitLab MR",
"nodes": [
{
"parameters": {
"content": "## Edit your own prompt \u2b07\ufe0f\n"
},
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
800,
460
],
"typeVersion": 1,
"id": "11973963-c9f2-4be7-a9ae-3959618b284b"
},
{
"parameters": {
"content": "## Filter comments and customize your trigger words \u2b07\ufe0f"
},
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-220,
500
],
"typeVersion": 1,
"id": "dbefd028-be11-459d-84a6-3f32bf26d7ca"
},
{
"parameters": {
"content": "## Replace your gitlab URL and token \u2b07\ufe0f"
},
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
40,
480
],
"typeVersion": 1,
"id": "28a74e51-1947-48d9-8b19-6c7ccd535767"
},
{
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "// Loop over input items and add a new field called 'myNewField' to the JSON of each one\nvar diff = $input.item.json.gitDiff\n\nlet lines = diff.trimEnd().split('\\n');\n\nlet originalCode = '';\nlet newCode = '';\n\nlines.forEach(line => {\n console.log(line)\n if (line.startsWith('-')) {\n originalCode += line + \"\\n\";\n } else if (line.startsWith('+')) {\n newCode += line + \"\\n\";\n } else {\n originalCode += line + \"\\n\";\n newCode += line + \"\\n\";\n }\n});\n\nreturn {\n originalCode:originalCode,\n newCode:newCode\n};\n\n"
},
"name": "Code",
"type": "n8n-nodes-base.code",
"position": [
860,
460
],
"typeVersion": 2,
"id": "ae159635-c46c-481f-a609-ef74ba8b4a7d"
},
{
"parameters": {
"content": "## Replace your gitlab URL and token \u2b07\ufe0f"
},
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
1120,
460
],
"typeVersion": 1,
"id": "7ec3cb71-90cd-4fa2-9724-17feed2fcb1f"
},
{
"parameters": {
"httpMethod": "POST",
"path": "e21095c0-1876-4cd9-9e92-a2eac737f03e",
"options": {}
},
"name": "Webhook",
"type": "n8n-nodes-base.webhook",
"position": [
-620,
680
],
"typeVersion": 1.1,
"id": "8620b174-5c10-45ec-9ffa-c08883618205"
},
{
"parameters": {
"model": "=GLM-4-Plus",
"options": {
"baseURL": "https://open.bigmodel.cn/api/paas/v4/"
}
},
"name": "big model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
1040,
780
],
"typeVersion": 1,
"id": "58310bd6-85f9-47de-9b49-140043451b3f",
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"url": "=https://gitlab.com/api/v4/projects/{{ $('Webhook').item.json[\"body\"][\"project\"][\"id\"] }}/merge_requests/{{ $('Webhook').item.json[\"body\"][\"object_attributes\"][\"iid\"] }}/changes",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "PRIVATE-TOKEN",
"value": "<redacted-credential>"
}
]
},
"options": {}
},
"name": "Get Changes",
"type": "n8n-nodes-base.httpRequest",
"position": [
80,
660
],
"typeVersion": 4.1,
"id": "b4db85dd-2a50-4493-9a7c-4904d888e13b"
},
{
"parameters": {
"fieldToSplitOut": "changes",
"options": {}
},
"name": "Split Out",
"type": "n8n-nodes-base.splitOut",
"position": [
280,
660
],
"typeVersion": 1,
"id": "ca8190af-dc9f-4b72-927d-ff7d6bbe7939"
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict",
"version": 1
},
"conditions": [
{
"operator": {
"type": "boolean",
"operation": "false",
"singleValue": true
},
"leftValue": "={{ $json.renamed_file }}",
"rightValue": ""
},
{
"operator": {
"type": "boolean",
"operation": "false",
"singleValue": true
},
"leftValue": "={{ $json.deleted_file }}",
"rightValue": ""
},
{
"operator": {
"type": "string",
"operation": "startsWith"
},
"leftValue": "={{ $json.diff }}",
"rightValue": "@@"
}
],
"combinator": "and"
},
"options": {}
},
"name": "Skip File Change",
"type": "n8n-nodes-base.if",
"position": [
480,
660
],
"typeVersion": 2,
"id": "32886e0d-57a9-4492-9a5f-39af0221f34f"
},
{
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "const parseLastDiff = (gitDiff) => {\n gitDiff = gitDiff.replace(/\\n\\\\ No newline at end of file/, '')\n \n const diffList = gitDiff.trimEnd().split('\\n').reverse();\n const lastLineFirstChar = diffList?.[0]?.[0];\n const lastDiff =\n diffList.find((item) => {\n return /^@@ \\-\\d+,\\d+ \\+\\d+,\\d+ @@/g.test(item);\n }) || '';\n\n const [lastOldLineCount, lastNewLineCount] = lastDiff\n .replace(/@@ \\-(\\d+),(\\d+) \\+(\\d+),(\\d+) @@.*/g, ($0, $1, $2, $3, $4) => {\n return `${+$1 + +$2},${+$3 + +$4}`;\n })\n .split(',');\n \n if (!/^\\d+$/.test(lastOldLineCount) || !/^\\d+$/.test(lastNewLineCount)) {\n return {\n lastOldLine: -1,\n lastNewLine: -1,\n gitDiff,\n };\n }\n\n\n const lastOldLine = lastLineFirstChar === '+' ? null : (parseInt(lastOldLineCount) || 0) - 1;\n const lastNewLine = lastLineFirstChar === '-' ? null : (parseInt(lastNewLineCount) || 0) - 1;\n\n return {\n lastOldLine,\n lastNewLine,\n gitDiff,\n };\n};\n\nreturn parseLastDiff($input.item.json.diff)\n"
},
"name": "Parse Last Diff Line",
"type": "n8n-nodes-base.code",
"position": [
680,
460
],
"typeVersion": 2,
"id": "89317b32-8452-4794-bbd8-d73ebb199ea2"
},
{
"parameters": {
"method": "POST",
"url": "=https://gitlab.com/api/v4/projects/{{ $('Webhook').item.json[\"body\"][\"project\"][\"id\"] }}/merge_requests/{{ $('Webhook').item.json[\"body\"][\"object_attributes\"][\"iid\"] }}/discussions",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "PRIVATE-TOKEN",
"value": "<redacted-credential>"
}
]
},
"sendBody": true,
"contentType": "multipart-form-data",
"bodyParameters": {
"parameters": [
{
"name": "body",
"value": "={{ $('Basic LLM Chain').item.json[\"text\"] }}"
},
{
"name": "position[position_type]",
"value": "text"
},
{
"name": "position[old_path]",
"value": "={{ $('Split Out').item.json.old_path }}"
},
{
"name": "position[new_path]",
"value": "={{ $('Split Out').item.json.new_path }}"
},
{
"name": "position[start_sha]",
"value": "={{ $('Get Changes').item.json.diff_refs.start_sha }}"
},
{
"name": "position[head_sha]",
"value": "={{ $('Get Changes').item.json.diff_refs.head_sha }}"
},
{
"name": "position[base_sha]",
"value": "={{ $('Get Changes').item.json.diff_refs.base_sha }}"
},
{
"name": "position[new_line]",
"value": "={{ $('Parse Last Diff Line').item.json.lastNewLine || '' }}"
},
{
"name": "position[old_line]",
"value": "={{ $('Parse Last Diff Line').item.json.lastOldLine || '' }}"
}
]
},
"options": {}
},
"name": "Post Discussions",
"type": "n8n-nodes-base.httpRequest",
"position": [
1420,
640
],
"typeVersion": 4.1,
"id": "3085eba8-c47b-4518-ae50-3e9cbed7ff6a"
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict",
"version": 1
},
"conditions": [
{
"operator": {
"type": "array",
"operation": "empty",
"singleValue": true
},
"leftValue": "={{ $('Get Review Count').all().filter(item => !item.json.system) }}",
"rightValue": 0
}
],
"combinator": "or"
},
"options": {}
},
"name": "Need Review",
"type": "n8n-nodes-base.if",
"position": [
-180,
680
],
"typeVersion": 2,
"id": "6686637b-facc-43c9-bbd9-aa78e9ff90c1"
},
{
"parameters": {
"content": "## Replace your gitlab URL and token \u2b07\ufe0f"
},
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
-480,
500
],
"typeVersion": 1,
"id": "a5409431-6822-4e56-acbf-1637df9252d8"
},
{
"parameters": {
"url": "=https://gitlab.com/api/v4/projects/{{ $json[\"body\"][\"project\"][\"id\"] }}/merge_requests/{{ $json[\"body\"][\"object_attributes\"][\"iid\"] }}/notes",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "PRIVATE-TOKEN",
"value": "<redacted-credential>"
}
]
},
"options": {}
},
"id": "17b3f0e9-3c28-487b-924f-e0014dcc8f4c",
"name": "Get Review Count",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
-400,
680
]
},
{
"parameters": {
"prompt": "=File path\uff1a{{ $('Skip File Change').item.json.new_path }}\n\n```Original code\n {{ $json.originalCode }}\n```\nchange to\n```New code\n {{ $json.newCode }}\n```\nPlease review the code changes in this section:",
"hasOutputParser": true,
"messages": {
"messageValues": [
{
"type": "AIMessagePromptTemplate",
"message": "# Overview:| \u60a8\u662f\u9ad8\u7ea7\u7f16\u7a0b\u4e13\u5bb6Bot\uff0c\u8d1f\u8d23\u5ba1\u67e5\u4ee3\u7801\u66f4\u6539\u5e76\u63d0\u4f9b\u5ba1\u67e5\u5efa\u8bae\u3002\u5728\u5efa\u8bae\u4e4b\u521d\uff0c\u9700\u8981\u660e\u786e\u505a\u51fa\u201c\u62d2\u7edd\u201d\u6216\u201c\u63a5\u53d7\u201d\u4ee3\u7801\u53d8\u66f4\u7684\u51b3\u5b9a\uff0c\u5e76\u4ee5\u201c\u53d8\u66f4\u5f97\u5206:\u5b9e\u9645\u5f97\u5206\u201d\u7684\u5f62\u5f0f\u5bf9\u53d8\u66f4\u8fdb\u884c\u8bc4\u5206\uff0c\u8bc4\u5206\u8303\u56f4\u4e3a0-100\u5206\u3002\u7136\u540e\uff0c\u4ee5\u7b80\u6d01\u7684\u8bed\u8a00\u548c\u4e25\u5389\u7684\u8bed\u6c14\u6307\u51fa\u5b58\u5728\u7684\u95ee\u9898\u3002\u5982\u679c\u60a8\u89c9\u5f97\u6709\u5fc5\u8981\uff0c\u53ef\u4ee5\u76f4\u63a5\u63d0\u4f9b\u4fee\u6539\u540e\u7684\u5185\u5bb9\u3002\u4f60\u7684\u8bc4\u5ba1\u63d0\u6848\u5fc5\u987b\u4f7f\u7528\u4e25\u683c\u7684Markdown\u683c\u5f0f\uff0c\u6700\u7ec8\u8f93\u51fa\u4e2d\u6587"
}
]
}
},
"name": "Basic LLM Chain",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
1020,
640
],
"typeVersion": 1.2,
"id": "793a7acd-584b-400d-9417-cd99446a6bc2"
}
],
"connections": {
"Code": {
"main": [
[
{
"node": "Basic LLM Chain",
"type": "main",
"index": 0
}
]
]
},
"Webhook": {
"main": [
[
{
"node": "Get Review Count",
"type": "main",
"index": 0
}
]
]
},
"big model": {
"ai_languageModel": [
[
{
"node": "Basic LLM Chain",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Get Changes": {
"main": [
[
{
"node": "Split Out",
"type": "main",
"index": 0
}
]
]
},
"Split Out": {
"main": [
[
{
"node": "Skip File Change",
"type": "main",
"index": 0
}
]
]
},
"Skip File Change": {
"main": [
[
{
"node": "Parse Last Diff Line",
"type": "main",
"index": 0
}
]
]
},
"Parse Last Diff Line": {
"main": [
[
{
"node": "Code",
"type": "main",
"index": 0
}
]
]
},
"Need Review": {
"main": [
[
{
"node": "Get Changes",
"type": "main",
"index": 0
}
]
]
},
"Get Review Count": {
"main": [
[
{
"node": "Need Review",
"type": "main",
"index": 0
}
]
]
},
"Basic LLM Chain": {
"main": [
[
{
"node": "Post Discussions",
"type": "main",
"index": 0
}
]
]
}
},
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "cd54124d-080a-492a-8497-0f588d45ac4d",
"meta": {
"templateCredsSetupCompleted": true
},
"id": "HQVtLtcRFm3NjRc9",
"tags": []
}
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.
openAiApi
Pro
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About this workflow
LLM Code Review in GitLab MR. Uses lmChatOpenAi, httpRequest, chainLlm. Webhook trigger; 16 nodes.
Source: https://gist.github.com/JeaNile/97854c81762249d9b967a8507e2059a8 — original creator credit. Request a take-down →
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