Tomohiro Goto This workflow corresponds to n8n.io template #10185 — we link there as the canonical source.
This workflow follows the Chainllm → HTTP Request recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Slack Multilingual Assistant with Gemini 2.5 Flash",
"tags": [],
"nodes": [
{
"id": "613a274c-124d-42cb-bcea-7769e8050eb1",
"name": "Webhook (Slack /trans)",
"type": "n8n-nodes-base.webhook",
"position": [
3328,
512
],
"parameters": {
"path": "slack/trans",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2
},
{
"id": "1f1ec470-c751-4de8-b2a8-4f9c2841139f",
"name": "Ack (Respond to Slack)",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
3584,
416
],
"parameters": {
"options": {
"responseCode": 200,
"responseHeaders": {
"entries": [
{
"name": "Content-Type",
"value": "text/plain; charset=utf-8"
}
]
}
},
"respondWith": "text",
"responseBody": "Translating..."
},
"typeVersion": 1
},
{
"id": "021bfa0c-46a6-45ca-89a2-bee8f1a28270",
"name": "Parse Slash Payload",
"type": "n8n-nodes-base.code",
"position": [
3584,
576
],
"parameters": {
"jsCode": "const payload = $json.body || $json;\nconst text = (payload.text || '').trim();\nreturn [{\n json: {\n text,\n response_url: payload.response_url,\n user_id: payload.user_id,\n user_name: payload.user_name\n }\n}];"
},
"typeVersion": 2
},
{
"id": "9229c1c8-99a3-47e9-9e51-9fdf611f3d6f",
"name": "Ack Mention Event",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
3584,
736
],
"parameters": {
"options": {
"responseCode": 200,
"responseHeaders": {
"entries": [
{
"name": "Content-Type",
"value": "application/json; charset=utf-8"
}
]
}
},
"respondWith": "json",
"responseBody": "={{ $json.body && $json.body.challenge ? {\"challenge\": $json.body.challenge } : {\"ok\": true} }}"
},
"typeVersion": 1
},
{
"id": "59f4988f-274d-4f5c-b304-7f253d507306",
"name": "Parse Mention Event",
"type": "n8n-nodes-base.code",
"position": [
3584,
896
],
"parameters": {
"jsCode": "/* app_mention \u30a4\u30d9\u30f3\u30c8\u5f62\u5f0f:\n{\n body: {\n event: {\n type: 'app_mention',\n user: 'U123',\n text: '<@Ubot> @trans \u3053\u308c\u8a33\u3057\u3066',\n channel: 'C123',\n ts: '173+1234567890',\n thread_ts: '173+1234567890' (optional)\n }\n }\n}\n*/\n\nconst body = $json.body || $json;\nconst ev = body.event || {};\n\nlet raw = ev.text || '';\n// <@U...> \u3068\u304b @trans \u3092\u9664\u53bb\nraw = raw.replace(/<@[^>]+>/g, '').replace(/@trans/gi, '').trim();\n\nconst thread_ts = ev.thread_ts || ev.ts;\n\nreturn [{\n json: {\n textToTranslate: raw,\n channel: ev.channel,\n thread_ts,\n user_id: ev.user\n }\n}];"
},
"typeVersion": 2
},
{
"id": "313833d3-b896-42e3-8c85-37a5f8140e4f",
"name": "Ack Reaction Event",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
3584,
1056
],
"parameters": {
"options": {
"responseCode": 200,
"responseHeaders": {
"entries": [
{
"name": "Content-Type",
"value": "application/json; charset=utf-8"
}
]
}
},
"respondWith": "json",
"responseBody": "={{ $json.body && $json.body.challenge ? {\"challenge\": $json.body.challenge } : {\"ok\": true} }}"
},
"typeVersion": 1
},
{
"id": "19651cc6-1157-4baf-a330-b1d999212c32",
"name": "Parse Reaction Event",
"type": "n8n-nodes-base.code",
"position": [
3584,
1216
],
"parameters": {
"jsCode": "/*\n Slack reaction_added payload \u4f8b:\n {\n \"event\": {\n \"type\": \"reaction_added\",\n \"user\": \"U123456\",\n \"reaction\": \"jp\",\n \"item\": {\n \"type\": \"message\",\n \"channel\": \"C123456\",\n \"ts\": \"173+1234567890\"\n }\n }\n }\n*/\n\nlet body = $json;\n\n// n8n\u306eWebhook\u30ce\u30fc\u30c9\u3067\u306f payload \u304c body \u4e0b\u306b\u5165\u308b\u5834\u5408\u3068\u3001\u76f4\u4e0b\u306b\u5165\u308b\u5834\u5408\u304c\u3042\u308b\nif ($json.body && typeof $json.body === 'object') {\n body = $json.body;\n}\n\nconst ev = body.event || {};\n\n// \u30c7\u30d0\u30c3\u30b0\u7528\u30ed\u30b0\uff08\u5fc5\u8981\u306a\u3089\u4e00\u6642\u7684\u306bON\uff09\nconsole.log('reaction event', ev);\n\nreturn [\n {\n json: {\n reactor_user: ev.user || null,\n reaction: ev.reaction || null,\n channel: ev.item?.channel || null,\n message_ts: ev.item?.ts || null,\n raw: ev\n }\n }\n];\n"
},
"typeVersion": 2
},
{
"id": "cc79dec9-6da6-4abb-bc92-47b01b6d1e48",
"name": "Fetch Original Message",
"type": "n8n-nodes-base.httpRequest",
"position": [
3760,
1376
],
"parameters": {
"url": "={{`https://slack.com/api/conversations.replies?channel=${$json.channel}&ts=${$json.message_ts}&limit=1`}}",
"options": {},
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Authorization",
"value": "Bearer YOUR_TOKEN_HERE"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "fc114495-2e73-4a78-ab32-43291dd7b326",
"name": "Prep Reaction Translation Input",
"type": "n8n-nodes-base.code",
"position": [
3936,
1376
],
"parameters": {
"jsCode": "const eventCtx = $node['Parse Reaction Event'].json;\nconst apiRes = $json;\n\nif (!apiRes.ok || !apiRes.messages || !apiRes.messages.length) {\n return [{ json: { skip: true, reason: 'no message found' } }];\n}\n\nconst msg = apiRes.messages[0];\nconst textToTranslate = msg.text || '';\nconst thread_ts = msg.thread_ts || msg.ts;\nconst channel = eventCtx.channel;\n\nreturn [{\n json: {\n textToTranslate,\n channel,\n thread_ts\n }\n}];"
},
"typeVersion": 2
},
{
"id": "b00abedc-8dd1-4193-b825-4b51b79694a5",
"name": "Google Gemini Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
3856,
1072
],
"parameters": {
"options": {
"temperature": 0.2,
"maxOutputTokens": 1024
}
},
"credentials": {
"googlePalmApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "be154439-e6f6-4eed-9715-2fbd5d3cd9b1",
"name": "Basic LLM Chain (/trans)",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
4096,
736
],
"parameters": {
"text": "=",
"batching": {},
"messages": {
"messageValues": [
{
"message": "You are a bilingual assistant for a Japanese/English mixed team.\nDetect whether the input is mainly Japanese or English.\nReturn exactly two labeled parts:\n\n[Original]\n<the original text>\n\n[Translation]\n<the translation in the OTHER language>\n\nRules:\n- Detect source language automatically (JA or EN).\n- Translate into the opposite language.\n- Do not add explanations or extra comments.\n- Keep both blocks in plain text."
},
{
"type": "HumanMessagePromptTemplate",
"message": "={{ $json.textToTranslate || $json.text }}"
}
]
},
"promptType": "define"
},
"typeVersion": 1.7
},
{
"id": "ecbacf69-4903-4643-9398-89ab3d903609",
"name": "Basic LLM Chain (@trans)",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
4096,
896
],
"parameters": {
"text": "=",
"batching": {},
"messages": {
"messageValues": [
{
"message": "You are a bilingual assistant for a Japanese/English mixed team.\nDetect whether the input is mainly Japanese or English.\nReturn exactly two labeled parts:\n\n[Original]\n<the original text>\n\n[Translation]\n<the translation in the OTHER language>\n\nRules:\n- Detect source language automatically (JA or EN).\n- Translate into the opposite language.\n- Do not add explanations or extra comments.\n- Keep both blocks in plain text."
},
{
"type": "HumanMessagePromptTemplate",
"message": "={{ $json.textToTranslate || $json.text }}"
}
]
},
"promptType": "define"
},
"typeVersion": 1.7
},
{
"id": "adeaa1b3-fbcb-4a11-a1cc-84dc75602478",
"name": "Basic LLM Chain (reaction)",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
4096,
1056
],
"parameters": {
"text": "=",
"batching": {},
"messages": {
"messageValues": [
{
"message": "You are a bilingual assistant for a Japanese/English mixed team.\nDetect whether the input is mainly Japanese or English.\nReturn exactly two labeled parts:\n\n[Original]\n<the original text>\n\n[Translation]\n<the translation in the OTHER language>\n\nRules:\n- Detect source language automatically (JA or EN).\n- Translate into the opposite language.\n- Do not add explanations or extra comments.\n- Keep both blocks in plain text."
},
{
"type": "HumanMessagePromptTemplate",
"message": "={{ $json.textToTranslate || $json.text }}"
}
]
},
"promptType": "define"
},
"typeVersion": 1.7
},
{
"id": "c443fefb-b54e-4b7a-b97f-60f115daa471",
"name": "Format Slack Message (/trans)",
"type": "n8n-nodes-base.code",
"position": [
4400,
736
],
"parameters": {
"jsCode": "/* /trans \u7528\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\n \u51fa\u529b\u30a4\u30e1\u30fc\u30b8:\n \u3010from @\u5f8c\u85e4\u3011\\n(\u65e5\u672c\u8a9e\u539f\u6587...)\\n----------\\n(\u82f1\u8a9e\u8a33...)\n*/\nconst ctx = $node['Parse Slash Payload'].json;\nconst llm = $json;\n\nlet output = llm.text || llm.output || '';\n\n// [Original] \u3068 [Translation] \u3092\u5206\u96e2\nlet original = '';\nlet translation = '';\nconst match = output.match(/\\[Original\\]([\\s\\S]*?)\\[Translation\\]([\\s\\S]*)/i);\nif (match) {\n original = match[1].trim();\n translation = match[2].trim();\n} else {\n translation = output.trim();\n}\n\nconst fromUser = ctx.user_id ? `<@${ctx.user_id}>` : (ctx.user_name || 'someone');\nconst finalMessage = `\u3010from ${fromUser}\u3011\\n${original}\\n----------\\n${translation}`;\n\nreturn [{\n json: {\n response_url: ctx.response_url,\n message: finalMessage\n }\n}];"
},
"typeVersion": 2
},
{
"id": "c939414e-b72e-4a70-a60c-809294ba8d58",
"name": "Format Slack Message (@trans)",
"type": "n8n-nodes-base.code",
"position": [
4400,
896
],
"parameters": {
"jsCode": "/* @trans \u7528\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\n \u8a33\u6587\u3060\u3051\u8fd4\u3059\uff08\u30b9\u30ec\u30c3\u30c9\uff09\n*/\nconst ctx = $node['Parse Mention Event'].json;\nconst llm = $json;\n\nlet output = llm.text || llm.output || '';\noutput = output\n .replace(/\\[Original\\][\\s\\S]*?\\[Translation\\]/i, '')\n .replace(/\\[Translation\\]/i, '')\n .trim();\n\nreturn [{\n json: {\n channel: ctx.channel,\n thread_ts: String(ctx.thread_ts),\n text: output\n }\n}];"
},
"typeVersion": 2
},
{
"id": "05b95459-5234-479d-8455-74504d4fbfa6",
"name": "Format Slack Message (reaction)",
"type": "n8n-nodes-base.code",
"position": [
4400,
1056
],
"parameters": {
"jsCode": "/* reaction \u7528\u30d5\u30a9\u30fc\u30de\u30c3\u30bf\n \u8a33\u6587\u3060\u3051\u8fd4\u3059\uff08\u30b9\u30ec\u30c3\u30c9\uff09\n*/\nconst ctx = $node['Prep Reaction Translation Input'].json;\nconst llm = $json;\n\nlet output = llm.text || llm.output || '';\noutput = output\n .replace(/\\[Original\\][\\s\\S]*?\\[Translation\\]/i, '')\n .replace(/\\[Translation\\]/i, '')\n .trim();\n\nreturn [{\n json: {\n channel: ctx.channel,\n thread_ts: String(ctx.thread_ts),\n text: output\n }\n}];"
},
"typeVersion": 2
},
{
"id": "3a592c03-37b3-4d68-a22c-1b7bff70c5f1",
"name": "Post to Slack (response_url)",
"type": "n8n-nodes-base.httpRequest",
"position": [
4576,
736
],
"parameters": {
"url": "={{$json.response_url}}",
"method": "POST",
"options": {},
"sendBody": true,
"sendHeaders": true,
"bodyParameters": {
"parameters": [
{
"name": "response_type",
"value": "in_channel"
},
{
"name": "text",
"value": "={{ $json.message }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "Content-Type",
"value": "application/json; charset=utf-8"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "07a8ba81-4fee-4073-b8fa-48de1e829bc9",
"name": "Post to Slack (@trans reply)",
"type": "n8n-nodes-base.httpRequest",
"position": [
4576,
896
],
"parameters": {
"url": "https://slack.com/api/chat.postMessage",
"method": "POST",
"options": {},
"sendBody": true,
"sendHeaders": true,
"bodyParameters": {
"parameters": [
{
"name": "channel",
"value": "={{ $json.channel }}"
},
{
"name": "text",
"value": "={{ $json.text }}"
},
{
"name": "thread_ts",
"value": "={{ $json.thread_ts.toString() }}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "Content-Type",
"value": "application/json; charset=utf-8"
},
{
"name": "Authorization",
"value": "Bearer YOUR_TOKEN_HERE"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "4a426e04-11a0-4e99-b37a-0aa2580ea043",
"name": "Post to Slack (reaction reply)",
"type": "n8n-nodes-base.httpRequest",
"position": [
4576,
1056
],
"parameters": {
"url": "https://slack.com/api/chat.postMessage",
"method": "POST",
"options": {},
"sendBody": true,
"sendHeaders": true,
"bodyParameters": {
"parameters": [
{
"name": "channel",
"value": "={{$json.channel}}"
},
{
"name": "text",
"value": "={{$json.text}}"
},
{
"name": "thread_ts",
"value": "={{$json.thread_ts}}"
}
]
},
"headerParameters": {
"parameters": [
{
"name": "Content-Type",
"value": "application/json; charset=utf-8"
},
{
"name": "Authorization",
"value": "Bearer YOUR_TOKEN_HERE"
}
]
}
},
"typeVersion": 4.2
},
{
"id": "a83c3091-3bac-4fe9-ba77-f15fd9051db3",
"name": "How to set up",
"type": "n8n-nodes-base.stickyNote",
"position": [
2880,
240
],
"parameters": {
"color": 4,
"width": 648,
"height": 200,
"content": "Slack Multilingual Assistant (Gemini 2.5 Flash)\n\n\ud83d\udd27 Three translation modes unified in one workflow:\n1\ufe0f\u20e3 /trans \u2014 Public bilingual announcements \n\u2003\u2003Format: \u3010from @user\u3011 Original ---------- Translation \n2\ufe0f\u20e3 @trans \u2014 Mention trigger for thread translation (translation only) \n3\ufe0f\u20e3 \ud83c\uddef\ud83c\uddf5 / \ud83c\uddfa\ud83c\uddf8 Reaction \u2014 Private on-demand translation \n\n\ud83d\udca1 All modes share the same Google Gemini 2.5 Flash core for automatic JA\u21c4EN detection."
},
"typeVersion": 1
},
{
"id": "c5f820f6-5027-49d4-89de-a1781aa354e9",
"name": "Webhook (Slack @trans + reaction)",
"type": "n8n-nodes-base.webhook",
"position": [
2944,
976
],
"parameters": {
"path": "slack/mention",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2
},
{
"id": "0a859374-d091-468f-bd68-ecb898b7a435",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
4384,
-16
],
"parameters": {
"color": 5,
"width": 480,
"height": 720,
"content": "\ud83d\udd27 Create and Configure your Slack App (TransBot)\n\n1\ufe0f\u20e3 Create App \n\u2003\u2192 From scratch \u2192 Name it \u201cTransBot\u201d \u2192 Select your workspace \n\n2\ufe0f\u20e3 Add Bot Token Scopes in OAuth & Permissions\n\u2003\u2022 commands \n\u2003\u2022 chat:write \n\u2003\u2022 app_mentions:read \n\u2003\u2022 reactions:read \n\u2003\u2022 channels:history \n\u2003\u2022 groups:history (optional for private channels)\n\n3\ufe0f\u20e3 Event Subscriptions \n\u2003Enable Events \u2705 \n\u2003Request URL \u2192 \n\u2003 https://<your-n8n-domain>/webhook/slack/mention \n\u2003Once verified, subscribe to bot events: \n\u2003 \u2013 app_mention \n\u2003 \u2013 message.channels \n\u2003and subscribe on behalf of users: \n\u2003 \u2013 reaction_added \n\n4\ufe0f\u20e3 Slash Command \n\u2003Command name: `/trans` \n\u2003Request URL \u2192 \n\u2003 https://<your-n8n-domain>/webhook/slack/trans \n\u2003Short desc: \u201cTranslate text JA\u21c4EN with Gemini 2.5 Flash\u201d\n\n5\ufe0f\u20e3 Install or Reinstall to Workspace \n\u2003Copy the new Bot User OAuth Token (xoxb-\u2026) \n\u2003and paste it into the HTTP Request headers in n8n \n\u2003(`Authorization: Bearer YOUR_TOKEN_HERE`)\n\n6\ufe0f\u20e3 Invite the bot to your channels: \n\u2003`/invite @TransBot`"
},
"typeVersion": 1
},
{
"id": "3e9045e2-e73b-4a23-a30a-9ecc27a16ed8",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
3824,
240
],
"parameters": {
"color": 3,
"width": 480,
"height": 368,
"content": "\ud83d\udd01 Workflow Architecture\n\n\u2022 Webhooks:\n\u2003 \u2013 /slack/trans \u2192 Slash Command \n\u2003 \u2013 /slack/mention \u2192 app_mention & reaction_added events \n\n\u2022 Language Model: Google Gemini 2.5 Flash \n\u2022 Logic:\n\u2003 \u2013 Detect source language (JA/EN) \n\u2003 \u2013 Translate to the opposite language \n\u2003 \u2013 Format Slack message per mode \n\n\u2022 Outputs:\n\u2003 \u2013 /trans \u2192 Posts bilingual message to channel (via response_url) \n\u2003 \u2013 @trans \u2192 Replies in thread with translation only \n\u2003 \u2013 Reaction \u2192 Replies in thread with translation only (for reader)\n\nAll three paths share the same Gemini core."
},
"typeVersion": 1
},
{
"id": "11a71607-a154-4a2a-8903-c896f4462551",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
2880,
1200
],
"parameters": {
"color": 3,
"width": 480,
"height": 272,
"content": "\ud83d\udea8 Common Errors & Fixes\n\n\u274c invalid_auth \n\u2003\u2192 Using an old token or bot not invited to channel \n\u2003\u2003Fix: Reinstall app / use latest xoxb token / `/invite @TransBot`\n\n\u274c missing_scope \n\u2003\u2192 A required scope is missing \n\u2003\u2003Fix: Add scope in OAuth & Permissions \u2192 Save \u2192 Reinstall\n\n\u274c no message found \n\u2003\u2192 Reaction event can\u2019t fetch original text \n\u2003\u2003Fix: Add `groups:history` scope for private channels"
},
"typeVersion": 1
},
{
"id": "a6cce3e2-180b-45ee-ba6d-b81e1bcdb5b5",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
4336,
1328
],
"parameters": {
"color": 4,
"width": 528,
"height": 144,
"content": "\u2705 Workflow is Active in n8n \n\u2705 Slack Event Subscription Request URL shows \u201cVerified \u2705\u201d \n\u2705 Bot Token includes chat:write, channels:history, reactions:read \n\u2705 /trans Slash Command responds with \u201cTranslating...\u201d then Gemini output \n\u2705 @trans mention replies in thread with translation only \n\u2705 \ud83c\uddef\ud83c\uddf5/\ud83c\uddfa\ud83c\uddf8 reaction adds translation reply in thread"
},
"typeVersion": 1
},
{
"id": "88bac316-9994-466b-8f75-b7d2f8cf1467",
"name": "Route by Event Type",
"type": "n8n-nodes-base.switch",
"position": [
3328,
976
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "1927dafe-a218-44de-a76b-47eefeabc55e",
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{$json.event_type}}",
"rightValue": "app_mention"
}
]
}
},
{
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "adda84a4-9099-4b3d-8ef2-4968c8ab8670",
"operator": {
"name": "filter.operator.equals",
"type": "string",
"operation": "equals"
},
"leftValue": "={{$json.event_type}}",
"rightValue": "reaction_added"
}
]
}
}
]
},
"options": {}
},
"typeVersion": 3.3
},
{
"id": "1a9163a3-bcab-475d-8372-de95de586e4f",
"name": "Skip Reaction When No Message Found",
"type": "n8n-nodes-base.if",
"position": [
4112,
1376
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "922fba50-9c9e-49c7-9bb0-6efe56e2f216",
"operator": {
"type": "string",
"operation": "notEquals"
},
"leftValue": "={{$json.skip}}",
"rightValue": "true"
},
{
"id": "d98fdf6c-83c4-4a66-8bdf-6d5854131727",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{$json.textToTranslate}}",
"rightValue": ""
}
]
},
"looseTypeValidation": true
},
"typeVersion": 2.2
},
{
"id": "1eb61e22-6993-4fd0-ac72-0f9b0fbb976d",
"name": "Filter Reaction Type",
"type": "n8n-nodes-base.code",
"position": [
3584,
1376
],
"parameters": {
"jsCode": "/*\n :jp: / :jp-flag: / :flag-jp: / :us: / :flag-us: \u306a\u3069\u306b\u5bfe\u5fdc\n \u2192 \u305d\u308c\u4ee5\u5916\u306e\u30ea\u30a2\u30af\u30b7\u30e7\u30f3\u306f\u30b9\u30ad\u30c3\u30d7\n*/\n\nconst allowedPatterns = ['jp', 'us'];\nconst reaction = ($json.reaction || '').toLowerCase();\n\n// \u90e8\u5206\u4e00\u81f4\u30c1\u30a7\u30c3\u30af\nconst isAllowed = allowedPatterns.some(p => reaction.includes(p));\n\nif (!isAllowed) {\n return [{ json: { skip: true, reason: `irrelevant reaction: ${reaction}` } }];\n}\n\nreturn [{ json: $json }];\n"
},
"typeVersion": 2
},
{
"id": "e3aa1071-f785-4338-a8f4-ae20384ae621",
"name": "Detect Slack Event Type",
"type": "n8n-nodes-base.code",
"position": [
3136,
976
],
"parameters": {
"jsCode": "const event = $json.body?.event || $json.event;\nreturn [{ json: { event_type: event.type, event } }];"
},
"typeVersion": 2
}
],
"active": true,
"settings": {
"executionOrder": "v1"
},
"connections": {
"Parse Mention Event": {
"main": [
[
{
"node": "Basic LLM Chain (@trans)",
"type": "main",
"index": 0
}
]
]
},
"Parse Slash Payload": {
"main": [
[
{
"node": "Basic LLM Chain (/trans)",
"type": "main",
"index": 0
}
]
]
},
"Route by Event Type": {
"main": [
[
{
"node": "Ack Mention Event",
"type": "main",
"index": 0
},
{
"node": "Parse Mention Event",
"type": "main",
"index": 0
}
],
[
{
"node": "Ack Reaction Event",
"type": "main",
"index": 0
},
{
"node": "Parse Reaction Event",
"type": "main",
"index": 0
}
]
]
},
"Filter Reaction Type": {
"main": [
[
{
"node": "Fetch Original Message",
"type": "main",
"index": 0
}
]
]
},
"Parse Reaction Event": {
"main": [
[
{
"node": "Filter Reaction Type",
"type": "main",
"index": 0
}
]
]
},
"Fetch Original Message": {
"main": [
[
{
"node": "Prep Reaction Translation Input",
"type": "main",
"index": 0
}
]
]
},
"Webhook (Slack /trans)": {
"main": [
[
{
"node": "Ack (Respond to Slack)",
"type": "main",
"index": 0
},
{
"node": "Parse Slash Payload",
"type": "main",
"index": 0
}
]
]
},
"Detect Slack Event Type": {
"main": [
[
{
"node": "Route by Event Type",
"type": "main",
"index": 0
}
]
]
},
"Basic LLM Chain (/trans)": {
"main": [
[
{
"node": "Format Slack Message (/trans)",
"type": "main",
"index": 0
}
]
]
},
"Basic LLM Chain (@trans)": {
"main": [
[
{
"node": "Format Slack Message (@trans)",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Chat Model": {
"ai_languageModel": [
[
{
"node": "Basic LLM Chain (reaction)",
"type": "ai_languageModel",
"index": 0
},
{
"node": "Basic LLM Chain (@trans)",
"type": "ai_languageModel",
"index": 0
},
{
"node": "Basic LLM Chain (/trans)",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Basic LLM Chain (reaction)": {
"main": [
[
{
"node": "Format Slack Message (reaction)",
"type": "main",
"index": 0
}
]
]
},
"Format Slack Message (/trans)": {
"main": [
[
{
"node": "Post to Slack (response_url)",
"type": "main",
"index": 0
}
]
]
},
"Format Slack Message (@trans)": {
"main": [
[
{
"node": "Post to Slack (@trans reply)",
"type": "main",
"index": 0
}
]
]
},
"Format Slack Message (reaction)": {
"main": [
[
{
"node": "Post to Slack (reaction reply)",
"type": "main",
"index": 0
}
]
]
},
"Prep Reaction Translation Input": {
"main": [
[
{
"node": "Skip Reaction When No Message Found",
"type": "main",
"index": 0
}
]
]
},
"Webhook (Slack @trans + reaction)": {
"main": [
[
{
"node": "Detect Slack Event Type",
"type": "main",
"index": 0
}
]
]
},
"Skip Reaction When No Message Found": {
"main": [
[
{
"node": "Basic LLM Chain (reaction)",
"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.
googlePalmApi
Pro
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About this workflow
This workflow automatically translates messages between Japanese and English inside Slack — perfect for mixed-language teams. In our real-world use case, our 8-person team includes Arif, an English-speaking teammate from Indonesia, while the rest mainly speak Japanese.
Source: https://n8n.io/workflows/10185/ — original creator credit. Request a take-down →
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