Redowan Ahmed Farhan This workflow corresponds to n8n.io template #17437 — we link there as the canonical source.
This workflow follows the Agent → Chainllm recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"id": "dd2mK6aG4p6XKh09",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "whatsapp AI auto responder",
"tags": [],
"nodes": [
{
"id": "1ae67eac-4c4e-4be9-839b-7f4bb0336295",
"name": "Overview",
"type": "n8n-nodes-base.stickyNote",
"position": [
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],
"parameters": {
"color": 7,
"width": 580,
"height": 1620,
"content": "## \ud83d\udcf1 WhatsApp AI Auto Responder (Multimodal)\n\nAnswers incoming WhatsApp messages of any type \u2014 text, audio, video, or image \u2014 by transcribing/describing the media with Gemini, then replying via a general-knowledge AI Agent with Wikipedia lookup.\n\n**Perfect for:** Small businesses or creators offering a public WhatsApp assistant that must handle whatever a customer sends, not just text.\n\n---\n\n## How it works\n\n1. **WhatsApp Trigger** \u2014 Receives incoming WhatsApp messages (text, audio, video, or image).\n2. **Split Out Message Parts** \u2014 Splits the trigger's messages array into individual message items.\n3. **Redirect Message Types** \u2014 Switch that routes each message to one of four branches: Audio, Video, Image, or Text (fallback).\n4. **Get Audio URL** *(audio branch)* \u2014 Fetches the downloadable media URL for a voice note.\n5. **Download Audio** *(audio branch)* \u2014 Downloads the audio file binary.\n6. **Google Gemini Audio** *(audio branch)* \u2014 Sends the audio to Gemini 1.5 Pro to transcribe it.\n7. **Format Response1** *(audio branch)* \u2014 Extracts the transcription text from Gemini's response.\n8. **Get Video URL** *(video branch)* \u2014 Fetches the downloadable media URL for a video.\n9. **Download Video** *(video branch)* \u2014 Downloads the video file binary.\n10. **Google Gemini Video** *(video branch)* \u2014 Sends the video to Gemini 1.5 Pro to describe it.\n11. **Format Response** *(video branch)* \u2014 Extracts the description text from Gemini's response.\n12. **Get Image URL** *(image branch)* \u2014 Fetches the downloadable media URL for an image.\n13. **Download Image** *(image branch)* \u2014 Downloads the image file binary.\n14. **Image Explainer** *(image branch)* \u2014 LangChain chain (using Google Gemini Chat Model1) that describes the image and transcribes visible text.\n15. **Get Text** *(text branch, fallback)* \u2014 Wait node that passes plain text messages straight through.\n16. **Text Summarizer** *(text branch)* \u2014 LangChain chain (using Google Gemini Chat Model2) that summarizes the user's text message.\n17. **Get User's Message** \u2014 Merges message type, text/description, sender, and any caption into one record, regardless of which branch it came from.\n18. **AI Agent** \u2014 Answers the user's question as a general-knowledge WhatsApp assistant, using Window Buffer Memory for context, Google Gemini Chat Model to reason, and Wikipedia as a lookup tool.\n19. **Window Buffer Memory** \u2014 Keeps a per-user conversation window, keyed by phone number.\n20. **Wikipedia** \u2014 Tool the agent can call for factual lookups.\n21. **Google Gemini Chat Model** \u2014 LLM backing the AI Agent.\n22. **Respond to User** \u2014 Sends the AI Agent's reply back to the sender over WhatsApp.\n\n---\n\n## Setup (~15 minutes)\n\n1. **WhatsApp Business API** \u2014 Add your credentials in *WhatsApp Trigger*, *Get Audio URL*, *Get Video URL*, *Get Image URL*, *Download Audio*, *Download Video*, *Download Image*, and *Respond to User*; set your phone number ID in *Respond to User*.\n2. **Google Gemini (PaLM) API** \u2014 Add your key in *Google Gemini Audio*, *Google Gemini Video*, *Google Gemini Chat Model*, *Google Gemini Chat Model1*, and *Google Gemini Chat Model2*.\n> Media (audio/video/image) is sent to Gemini as inline base64 data \u2014 large files may hit request size limits."
},
"typeVersion": 1
},
{
"id": "18a4c2ba-0842-471e-97a9-1893b19101e4",
"name": "Section 1 - Trigger & Message Routing",
"type": "n8n-nodes-base.stickyNote",
"position": [
-2256,
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],
"parameters": {
"color": 5,
"width": 880,
"height": 488,
"content": "## 1\ufe0f\u20e3 Trigger & Message Routing\n\nThe **WhatsApp Trigger** receives every incoming message. **Split Out Message Parts** breaks the payload into individual items, and **Redirect Message Types** inspects each one to route it down an Audio, Video, Image, or Text path depending on what the user sent."
},
"typeVersion": 1
},
{
"id": "0abcff68-8b86-4720-86ed-40a59bcd0676",
"name": "Section 2 - Media Retrieval",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1200,
112
],
"parameters": {
"color": 6,
"width": 552,
"height": 1424,
"content": "## 2\ufe0f\u20e3 Media Retrieval\n\nFor non-text messages, **Get Audio URL**, **Get Video URL**, and **Get Image URL** fetch the WhatsApp media's downloadable link, and **Download Audio**, **Download Video**, and **Download Image** pull down the actual file. **Get Text** passes plain text messages straight through with no download needed."
},
"typeVersion": 1
},
{
"id": "38cd97d7-09c3-4e41-ba45-086c84e5f2be",
"name": "Section 3 - Multimodal Transcription & Summarization",
"type": "n8n-nodes-base.stickyNote",
"position": [
-576,
96
],
"parameters": {
"color": 3,
"width": 820,
"height": 1580,
"content": "## 3\ufe0f\u20e3 Multimodal Transcription & Summarization\n\nEach media type gets converted to text: **Google Gemini Audio** transcribes voice notes, **Google Gemini Video** describes video content, and **Image Explainer** (backed by **Google Gemini Chat Model1**) describes images and reads any visible text. **Text Summarizer** (backed by **Google Gemini Chat Model2**) condenses plain text messages. **Format Response** and **Format Response1** extract the plain text from Gemini's raw output before **Get User's Message** merges everything \u2014 type, text, sender, and caption \u2014 into one record."
},
"typeVersion": 1
},
{
"id": "13decb5f-7a9f-4644-86d3-18ad94c4caf1",
"name": "Section 4 - AI Agent & Response",
"type": "n8n-nodes-base.stickyNote",
"position": [
336,
688
],
"parameters": {
"color": 4,
"width": 860,
"height": 572,
"content": "## 4\ufe0f\u20e3 AI Agent & Response\n\nThe **AI Agent** answers the user's question as a general-knowledge WhatsApp assistant, drawing on **Window Buffer Memory** for per-user conversation history, **Google Gemini Chat Model** for reasoning, and **Wikipedia** for factual lookups. **Respond to User** sends the reply back over WhatsApp."
},
"typeVersion": 1
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{
"id": "9e477118-37b6-458f-8514-ceb9b7b278c5",
"name": "WhatsApp Trigger",
"type": "n8n-nodes-base.whatsAppTrigger",
"position": [
-2160,
736
],
"parameters": {
"options": {},
"updates": [
"messages"
]
},
"typeVersion": 1
},
{
"id": "0d2a8260-c60b-4114-8c35-8b498b9cb199",
"name": "Get Audio URL",
"type": "n8n-nodes-base.whatsApp",
"position": [
-1072,
336
],
"parameters": {
"resource": "media",
"operation": "mediaUrlGet",
"mediaGetId": "={{ $json.audio.id }}"
},
"typeVersion": 1
},
{
"id": "818096a9-89aa-4fe0-bdf8-51a4b00b0f06",
"name": "Get Video URL",
"type": "n8n-nodes-base.whatsApp",
"position": [
-1072,
704
],
"parameters": {
"resource": "media",
"operation": "mediaUrlGet",
"mediaGetId": "={{ $json.video.id }}"
},
"typeVersion": 1
},
{
"id": "deb30b3a-2516-448d-abe8-650f1422a03b",
"name": "Get Image URL",
"type": "n8n-nodes-base.whatsApp",
"position": [
-1072,
1040
],
"parameters": {
"resource": "media",
"operation": "mediaUrlGet",
"mediaGetId": "={{ $json.image.id }}"
},
"typeVersion": 1
},
{
"id": "805d3ab9-85c3-4102-a11d-7656c6ff400e",
"name": "Download Video",
"type": "n8n-nodes-base.httpRequest",
"position": [
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],
"parameters": {
"url": "={{ $json.url }}",
"options": {},
"authentication": "predefinedCredentialType",
"nodeCredentialType": "whatsAppApi"
},
"typeVersion": 4.2
},
{
"id": "3a319187-db77-4aca-adbe-9de889df7a00",
"name": "Download Audio",
"type": "n8n-nodes-base.httpRequest",
"position": [
-912,
336
],
"parameters": {
"url": "={{ $json.url }}",
"options": {},
"authentication": "predefinedCredentialType",
"nodeCredentialType": "whatsAppApi"
},
"typeVersion": 4.2
},
{
"id": "0ad95cdd-e566-47fd-af2c-967e01793b2c",
"name": "Download Image",
"type": "n8n-nodes-base.httpRequest",
"position": [
-912,
1040
],
"parameters": {
"url": "={{ $json.url }}",
"options": {},
"authentication": "predefinedCredentialType",
"nodeCredentialType": "whatsAppApi"
},
"typeVersion": 4.2
},
{
"id": "3b72cd78-4aa6-4cb9-a5e9-741c08c87ac9",
"name": "Window Buffer Memory",
"type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
"position": [
576,
1056
],
"parameters": {
"sessionKey": "=whatsapp-tutorial-{{ $json.from }}",
"sessionIdType": "customKey"
},
"typeVersion": 1.2
},
{
"id": "ccf376bb-90b3-4dcd-b7d9-9a9acaabacd4",
"name": "Get User's Message",
"type": "n8n-nodes-base.set",
"position": [
384,
880
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d990cbd6-a408-4ec4-a889-41be698918d9",
"name": "message_type",
"type": "string",
"value": "={{ $('Split Out Message Parts').item.json.type }}"
},
{
"id": "23b785c3-f38e-4706-80b7-51f333bba3bd",
"name": "message_text",
"type": "string",
"value": "={{ $json.text }}"
},
{
"id": "6e83f9a7-cf75-4182-b2d2-3151e8af76b9",
"name": "from",
"type": "string",
"value": "={{ $('WhatsApp Trigger').item.json.messages[0].from }}"
},
{
"id": "da4b602a-28ca-4b0d-a747-c3d3698c3731",
"name": "message_caption",
"type": "string",
"value": "={{ $('Redirect Message Types').item.json.video && $('Redirect Message Types').item.json.video.caption || '' }}\n{{ $('Redirect Message Types').item.json.image && $('Redirect Message Types').item.json.image.caption || ''}}\n{{ $('Redirect Message Types').item.json.audio && $('Redirect Message Types').item.json.audio.caption || ''}}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "51daa48b-0170-4c3a-ad6f-50e1859668c3",
"name": "Split Out Message Parts",
"type": "n8n-nodes-base.splitOut",
"position": [
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736
],
"parameters": {
"options": {},
"fieldToSplitOut": "messages"
},
"typeVersion": 1
},
{
"id": "c9170ef3-3855-48f9-853c-876b641620ed",
"name": "Wikipedia",
"type": "@n8n/n8n-nodes-langchain.toolWikipedia",
"position": [
688,
1056
],
"parameters": {},
"typeVersion": 1
},
{
"id": "5d659385-e637-49be-bd1b-98d580128a36",
"name": "Redirect Message Types",
"type": "n8n-nodes-base.switch",
"position": [
-1616,
768
],
"parameters": {
"rules": {
"values": [
{
"outputKey": "Audio Message",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
},
"leftValue": "={{ $json.type == 'audio' && Boolean($json.audio) }}",
"rightValue": "audio"
}
]
},
"renameOutput": true
},
{
"outputKey": "Video Message",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "82aa5ff4-c9b6-4187-a27e-c7c5d9bfdda0",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
},
"leftValue": "={{ $json.type == 'video' && Boolean($json.video) }}",
"rightValue": ""
}
]
},
"renameOutput": true
},
{
"outputKey": "Image Message",
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "05b30af4-967b-4824-abdc-84a8292ac0e5",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
},
"leftValue": "={{ $json.type == 'image' && Boolean($json.image) }}",
"rightValue": ""
}
]
},
"renameOutput": true
}
]
},
"options": {
"fallbackOutput": "extra",
"renameFallbackOutput": "Text Message"
}
},
"typeVersion": 3.2
},
{
"id": "a3963686-fec6-4e6f-b3c9-54a4cd0e01be",
"name": "Get Text",
"type": "n8n-nodes-base.wait",
"position": [
-1072,
1344
],
"parameters": {
"amount": 0
},
"typeVersion": 1.1
},
{
"id": "f4faaef3-cd66-4380-8e23-541904a4f465",
"name": "Respond to User",
"type": "n8n-nodes-base.whatsApp",
"position": [
928,
976
],
"parameters": {
"textBody": "={{ $json.output }}",
"operation": "send",
"phoneNumberId": "477115632141067",
"additionalFields": {},
"recipientPhoneNumber": "={{ $('WhatsApp Trigger').item.json.messages[0].from }}"
},
"typeVersion": 1
},
{
"id": "40650e1b-c073-44e7-81e9-0b256d48ea57",
"name": "Image Explainer",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
-384,
1040
],
"parameters": {
"text": "Here is an image sent by the user. Describe the image and transcribe any text visible in the image.",
"messages": {
"messageValues": [
{
"type": "HumanMessagePromptTemplate",
"messageType": "imageBinary"
}
]
},
"promptType": "define"
},
"typeVersion": 1.4
},
{
"id": "8c614bd4-4010-49e3-933b-fa0b3a95f38c",
"name": "Format Response",
"type": "n8n-nodes-base.set",
"position": [
-224,
704
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "2ec0e573-373b-4692-bfae-86b6d3b9aa9a",
"name": "text",
"type": "string",
"value": "={{ $json.candidates[0].content.parts[0].text }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "a39cc3ed-264f-42bb-9d25-acf86e4b2e45",
"name": "Google Gemini Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
432,
1056
],
"parameters": {
"options": {},
"modelName": "models/gemini-1.5-pro-002"
},
"typeVersion": 1
},
{
"id": "7b937a6d-915a-4d96-af66-34e28815b636",
"name": "Google Gemini Audio",
"type": "n8n-nodes-base.httpRequest",
"position": [
-464,
336
],
"parameters": {
"url": "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro-002:generateContent",
"method": "POST",
"options": {},
"jsonBody": "={{\n{\n \"contents\": [{\n \"parts\":[\n {\"text\": \"Transcribe this audio\"},\n {\"inlineData\": {\n \"mimeType\": `audio/${$binary.data.fileExtension}`,\n \"data\": $input.item.binary.data.data }\n }\n ]\n }]\n}\n}}",
"sendBody": true,
"sendHeaders": true,
"specifyBody": "json",
"authentication": "predefinedCredentialType",
"headerParameters": {
"parameters": [
{
"name": "Content-Type",
"value": "application/json"
}
]
},
"nodeCredentialType": "googlePalmApi"
},
"typeVersion": 4.2
},
{
"id": "486e4f8a-57b5-4aba-9365-d8d0ca7a82aa",
"name": "Google Gemini Video",
"type": "n8n-nodes-base.httpRequest",
"position": [
-464,
704
],
"parameters": {
"url": "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro-002:generateContent",
"method": "POST",
"options": {},
"jsonBody": "={{\n{\n \"contents\": [{\n \"parts\":[\n {\"text\": \"Describe this video\"},\n {\"inlineData\": {\n \"mimeType\": `video/${$binary.data.fileExtension}`,\n \"data\": $input.item.binary.data.data }\n }\n ]\n }]\n}\n}}",
"sendBody": true,
"sendHeaders": true,
"specifyBody": "json",
"authentication": "predefinedCredentialType",
"headerParameters": {
"parameters": [
{
"name": "Content-Type",
"value": "application/json"
}
]
},
"nodeCredentialType": "googlePalmApi"
},
"typeVersion": 4.2
},
{
"id": "1befbae7-3d2b-4e89-8a97-0fec791f24d2",
"name": "Google Gemini Chat Model1",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
-416,
1184
],
"parameters": {
"options": {},
"modelName": "models/gemini-1.5-pro-002"
},
"typeVersion": 1
},
{
"id": "4839ee89-20cf-4abc-9c17-071248dd2d44",
"name": "Google Gemini Chat Model2",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
-416,
1488
],
"parameters": {
"options": {},
"modelName": "models/gemini-1.5-pro-002"
},
"typeVersion": 1
},
{
"id": "4e2a8b65-d328-4820-bcef-235562accd25",
"name": "Format Response1",
"type": "n8n-nodes-base.set",
"position": [
-224,
336
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "2ec0e573-373b-4692-bfae-86b6d3b9aa9a",
"name": "text",
"type": "string",
"value": "={{ $json.candidates[0].content.parts[0].text }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "61feff06-9667-444f-9740-ed7e6af5cba6",
"name": "Text Summarizer",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
-384,
1344
],
"parameters": {
"text": "={{ $json.text.body || $json.text }}",
"messages": {
"messageValues": [
{
"message": "Summarize the user's message succinctly."
}
]
},
"promptType": "define"
},
"typeVersion": 1.4
},
{
"id": "2928fd5f-4876-4b6c-9ad8-1a4ae7d6a6b4",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
560,
880
],
"parameters": {
"text": "=The user sent the following message\nmessage type: {{ $json.message_type }}\nmessage text or description:\n```{{ $json.message_text }}```\n{{ $json.message_caption ? `message caption: ${$json.message_caption.trim()}` : '' }}",
"options": {
"systemMessage": "You are a general knowledge assistant made available to the public via whatsapp. Help answer the user's query succiently and factually."
},
"promptType": "define"
},
"typeVersion": 1.6
}
],
"active": false,
"settings": {
"binaryMode": "separate",
"availableInMCP": false,
"executionOrder": "v1"
},
"versionId": "23e7dc24-1c7c-4f7c-badf-47e47caa11e9",
"nodeGroups": [],
"connections": {
"AI Agent": {
"main": [
[
{
"node": "Respond to User",
"type": "main",
"index": 0
}
]
]
},
"Get Text": {
"main": [
[
{
"node": "Text Summarizer",
"type": "main",
"index": 0
}
]
]
},
"Wikipedia": {
"ai_tool": [
[
{
"node": "AI Agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Get Audio URL": {
"main": [
[
{
"node": "Download Audio",
"type": "main",
"index": 0
}
]
]
},
"Get Image URL": {
"main": [
[
{
"node": "Download Image",
"type": "main",
"index": 0
}
]
]
},
"Get Video URL": {
"main": [
[
{
"node": "Download Video",
"type": "main",
"index": 0
}
]
]
},
"Download Audio": {
"main": [
[
{
"node": "Google Gemini Audio",
"type": "main",
"index": 0
}
]
]
},
"Download Image": {
"main": [
[
{
"node": "Image Explainer",
"type": "main",
"index": 0
}
]
]
},
"Download Video": {
"main": [
[
{
"node": "Google Gemini Video",
"type": "main",
"index": 0
}
]
]
},
"Format Response": {
"main": [
[
{
"node": "Get User's Message",
"type": "main",
"index": 0
}
]
]
},
"Image Explainer": {
"main": [
[
{
"node": "Get User's Message",
"type": "main",
"index": 0
}
]
]
},
"Text Summarizer": {
"main": [
[
{
"node": "Get User's Message",
"type": "main",
"index": 0
}
]
]
},
"Format Response1": {
"main": [
[
{
"node": "Get User's Message",
"type": "main",
"index": 0
}
]
]
},
"WhatsApp Trigger": {
"main": [
[
{
"node": "Split Out Message Parts",
"type": "main",
"index": 0
}
]
]
},
"Get User's Message": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Audio": {
"main": [
[
{
"node": "Format Response1",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Video": {
"main": [
[
{
"node": "Format Response",
"type": "main",
"index": 0
}
]
]
},
"Window Buffer Memory": {
"ai_memory": [
[
{
"node": "AI Agent",
"type": "ai_memory",
"index": 0
}
]
]
},
"Redirect Message Types": {
"main": [
[
{
"node": "Get Audio URL",
"type": "main",
"index": 0
}
],
[
{
"node": "Get Video URL",
"type": "main",
"index": 0
}
],
[
{
"node": "Get Image URL",
"type": "main",
"index": 0
}
],
[
{
"node": "Get Text",
"type": "main",
"index": 0
}
]
]
},
"Split Out Message Parts": {
"main": [
[
{
"node": "Redirect Message Types",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Google Gemini Chat Model1": {
"ai_languageModel": [
[
{
"node": "Image Explainer",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Google Gemini Chat Model2": {
"ai_languageModel": [
[
{
"node": "Text Summarizer",
"type": "ai_languageModel",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow auto-replies to incoming WhatsApp messages (text, audio, video, or images) by downloading any media, converting it to text with Google Gemini, and generating a concise answer with a Gemini-powered agent that can use Wikipedia for factual lookups. Triggers when a…
Source: https://n8n.io/workflows/17437/ — original creator credit. Request a take-down →
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