Hunyao This workflow corresponds to n8n.io template #7162 — we link there as the canonical source.
This workflow follows the Chainllm → Chainsummarization 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": "twvLZRSedaF7hjy2",
"name": "Reddit Daily Hot Posts \u2192 Gmail Digest (Multi-Subreddit, AI Summaries)",
"tags": [],
"nodes": [
{
"id": "143de7a4-65e3-431c-96b2-1ac4aefff128",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
880,
-464
],
"parameters": {
"width": 1328,
"height": 544,
"content": "## Retrieve daily hot subreddit posts"
},
"typeVersion": 1
},
{
"id": "447db4d5-fb68-4035-b6c8-87b40f829c24",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
432,
-464
],
"parameters": {
"color": 5,
"width": 256,
"height": 544,
"content": "## Set subreddits you wish to track"
},
"typeVersion": 1
},
{
"id": "a20dd531-ea12-4dbb-86e0-4ae6d0fc0a22",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
2448,
-656
],
"parameters": {
"width": 1760,
"height": 496,
"content": "## Process each post"
},
"typeVersion": 1
},
{
"id": "0b9096aa-22c9-4487-889a-af55ab509f20",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
2448,
16
],
"parameters": {
"width": 1904,
"height": 736,
"content": "## Summarizes each post and sends to your inbox"
},
"typeVersion": 1
},
{
"id": "fce66882-b289-4bd5-829b-104188cc9974",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
160,
-464
],
"parameters": {
"color": 5,
"width": 256,
"height": 544,
"content": "## Set interval in which you which to receive newsletter in your inbox"
},
"typeVersion": 1
},
{
"id": "806fef98-e4a9-4b7d-8eb7-ae5aa4e75829",
"name": "Schedule: Daily run",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
240,
-192
],
"parameters": {
"rule": {
"interval": [
{
"triggerAtHour": 6
}
]
}
},
"typeVersion": 1.2
},
{
"id": "bd33313a-7409-4bb2-ba68-47528d416624",
"name": "Split Subreddit List",
"type": "n8n-nodes-base.splitOut",
"position": [
736,
-192
],
"parameters": {
"options": {
"destinationFieldName": "subreddit"
},
"fieldToSplitOut": "subreddits"
},
"typeVersion": 1
},
{
"id": "6eb61b05-f1bf-47b0-99f5-5734838fa92e",
"name": "List Hot Posts",
"type": "n8n-nodes-base.reddit",
"position": [
928,
-192
],
"parameters": {
"filters": {
"category": "hot"
},
"operation": "getAll",
"returnAll": true,
"subreddit": "={{ $json.subreddit }}"
},
"credentials": {
"redditOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "b9eb5d1f-4a0b-4db9-9063-1fc7c8358ed4",
"name": "Attach ISO Date to Posts1",
"type": "n8n-nodes-base.merge",
"position": [
1376,
-192
],
"parameters": {
"mode": "combine",
"options": {},
"combineBy": "combineByPosition"
},
"typeVersion": 3.2
},
{
"id": "573e28e0-521a-4f8f-8c00-1a5fc0d2d1f0",
"name": "Normalize Post Date (created_utc \u2192 ISO)",
"type": "n8n-nodes-base.set",
"position": [
1152,
-272
],
"parameters": {
"options": {
"ignoreConversionErrors": true
},
"assignments": {
"assignments": [
{
"id": "4430b889-070a-4fc0-870f-99abfc8358f4",
"name": "created_iso",
"type": "string",
"value": "={{ \n (() => {\n const ts = Number($json.created_utc); // Reddit = seconds\n const ms = ts > 1e12 ? ts : ts * 1000;\n return new Date(ms).toISOString(); // e.g. \"2025-07-14T15:25:27.000Z\"\n })() \n}}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "737f2bc8-c044-4956-b561-57fb9e0cc59e",
"name": "Select Fields (id, score, url, date, subreddit)",
"type": "n8n-nodes-base.set",
"position": [
1600,
-192
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "76648d06-3f14-4b5f-9f8f-96db17245efd",
"name": "subreddit",
"type": "string",
"value": "={{ $json.subreddit }}"
},
{
"id": "c91431ae-68b9-4a47-966f-d20a4115e912",
"name": "id",
"type": "string",
"value": "={{ $json.id }}"
},
{
"id": "610a5fb8-3620-4a40-9217-8aedb8882e3e",
"name": "date",
"type": "string",
"value": "={{ $json.created_iso }}"
},
{
"id": "11155f65-05cf-4a2c-852d-b318be54271a",
"name": "score",
"type": "number",
"value": "={{ $json.score }}"
},
{
"id": "fd9a0200-08ed-40f1-b9b7-733ee22aa0a6",
"name": "url",
"type": "string",
"value": "={{ $json.url }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "8ee37fa1-dac3-40ee-84cf-9ec997cc8dab",
"name": "Filter: Last 24h & Score > 30",
"type": "n8n-nodes-base.filter",
"position": [
1824,
-192
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "1f69ceb7-48ec-47e9-af5c-60ddb9e84f93",
"operator": {
"type": "dateTime",
"operation": "afterOrEquals"
},
"leftValue": "={{ $json.date }}",
"rightValue": "={{ new Date(new Date($now).getTime() - 24 * 60 * 60 * 1000).toISOString() }}"
},
{
"id": "3081a1f6-5405-4389-b6a3-a70210821b1f",
"operator": {
"type": "number",
"operation": "gt"
},
"leftValue": "={{ $json.score }}",
"rightValue": 30
}
]
}
},
"typeVersion": 2.2
},
{
"id": "3859d2ae-dea4-49b9-b087-c5e6a5405b1f",
"name": "Sort by Score (desc)",
"type": "n8n-nodes-base.sort",
"position": [
2048,
-192
],
"parameters": {
"options": {},
"sortFieldsUi": {
"sortField": [
{
"order": "descending",
"fieldName": "score"
}
]
}
},
"typeVersion": 1
},
{
"id": "bb18c422-097b-4e64-bbfe-64049f487920",
"name": "Iterate Posts (single batch)",
"type": "n8n-nodes-base.splitInBatches",
"position": [
2256,
-192
],
"parameters": {
"options": {},
"batchSize": "={{ $input.all().length }}"
},
"typeVersion": 3
},
{
"id": "482ae953-738b-4aec-a66c-cacc162a9a44",
"name": "Get Post by ID",
"type": "n8n-nodes-base.reddit",
"position": [
2496,
-480
],
"parameters": {
"postId": "={{ $json.id }}",
"operation": "get",
"subreddit": "={{ $json.subreddit }}"
},
"credentials": {
"redditOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "5cfd61e4-6928-445c-a148-2c8ac8accb27",
"name": "Deduplicate by ID",
"type": "n8n-nodes-base.removeDuplicates",
"position": [
2720,
-480
],
"parameters": {
"compare": "selectedFields",
"options": {},
"fieldsToCompare": "id"
},
"typeVersion": 2
},
{
"id": "26d7e22f-14bd-4320-bb56-1e9d69ad367d",
"name": "Build Post Body (root)",
"type": "n8n-nodes-base.code",
"position": [
2944,
-480
],
"parameters": {
"jsCode": "/**\n * Build one n8n item per Reddit post that arrives on the input.\n * Run mode: \u201cRun Once for All Items\u201d\n */\nreturn $input.all().map(({ json: p }) => {\n // \u2500\u2500\u2500 convert epoch-seconds \u2192 YYYY-MM-DD (UTC) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n const createdUtcDate =\n (typeof p.created_utc === 'number')\n ? new Date(p.created_utc * 1000).toISOString().slice(0, 10) // \"YYYY-MM-DD\"\n : null; // fallback if field missing\n\n return {\n json: {\n /* \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 identifiers \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 */\n post_id : p.id || (p.name ? p.name.replace('t3_', '') : null),\n comment_id: null, // post has no comment_id\n parent_id : null,\n\n /* \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 text & author \u2500\u2500\u2500\u2500\u2500\u2500\u2500 */\n body : `${p.title || ''}${p.selftext ? '\\n\\n' + p.selftext : ''}`,\n author : p.author,\n score : p.score,\n\n /* \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 context \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 */\n depth : -1, // reserve \u20131 for the root post\n subreddit : p.subreddit,\n permalink : `https://reddit.com${p.permalink}`,\n\n /* \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 timestamps \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 */\n created_utc: createdUtcDate, // e.g. \"2024-07-01\"\n\n /* \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 metadata \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 */\n chunk_type: 'post' // post | comment | reply\n }\n };\n});"
},
"typeVersion": 2
},
{
"id": "5ef14e2a-04a9-4419-8831-da9128cc1740",
"name": "List Top-level Comments",
"type": "n8n-nodes-base.reddit",
"position": [
3168,
-416
],
"parameters": {
"postId": "={{ $json.post_id }}",
"resource": "postComment",
"operation": "getAll",
"subreddit": "={{ $json.subreddit }}"
},
"credentials": {
"redditOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "861258dc-6bac-489f-a99a-31753c197b20",
"name": "Flatten Comment Threads",
"type": "n8n-nodes-base.code",
"position": [
3392,
-416
],
"parameters": {
"jsCode": "/* ---------- helper ---------- */\nfunction walkChildren(node, store, depth = 0, sub) {\n if (!node || node.kind !== 't1') return;\n const d = node.data;\n\n /* convert epoch-seconds \u2192 YYYY-MM-DD (UTC) */\n const createdUtcDate =\n (typeof d.created_utc === 'number')\n ? new Date(d.created_utc * 1000).toISOString().slice(0, 10)\n : null;\n \n store.push({\n post_id : d.link_id?.replace('t3_',''),\n comment_id: d.name,\n parent_id : d.parent_id,\n body : d.body || '',\n author : d.author,\n score : d.score,\n depth,\n subreddit : sub, \n permalink : `https://reddit.com${d.permalink}`,\n created_utc: createdUtcDate \n });\n\n (d.replies?.data?.children || [])\n .forEach(c => walkChildren(c, store, depth+1, sub));\n}\n\n/* ---------- main ---------- */\nconst flat = [];\nitems.forEach(item => {\n const root = item.json;\n const sub = root.subreddit; // NEW\n walkChildren({ kind:'t1', data: root }, flat, 0, sub);\n});\nreturn flat.map(o => ({ json:o }));\n"
},
"typeVersion": 2
},
{
"id": "a82e836e-f97b-4fb2-8fd6-332cb226e92a",
"name": "Filter: Valid Comments",
"type": "n8n-nodes-base.filter",
"position": [
3616,
-416
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "0f7812db-c828-4389-8dd4-37ab54c626ad",
"operator": {
"type": "string",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json.post_id }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "22338a1a-f650-432a-a1af-e3119946f3a3",
"name": "Append Posts + Comments",
"type": "n8n-nodes-base.merge",
"position": [
3840,
-480
],
"parameters": {},
"typeVersion": 3.2
},
{
"id": "3541c2bc-a535-45b6-a0a8-138bdbff2b31",
"name": "Build Thread Text",
"type": "n8n-nodes-base.code",
"position": [
4064,
-480
],
"parameters": {
"jsCode": "/**\n * n8n Code node \u25b8 build a stringified Reddit-style comment thread\n *\n * Works with both \"old\" (object_id, parent_id t1_/t3_) and \"new\" (post_id, comment_id, chunk_type) schemas.\n *\n * Input : items[] each item.json has some mix of:\n * { uid?, object_id?, post_id?, comment_id?, parent_uid?, parent_id?, chunk_type?, body, created_utc }\n * Output : items[] one per root post:\n * {\n * post_id: \"1dsmdb7\",\n * thread_text: \"POST: ...\\n- top-level\\n - reply\\n\"\n * }\n */\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 helpers \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nconst stripPrefix = id => {\n if (!id) return null;\n // accept fullnames t1_, t3_, t4_ etc\n return String(id).replace(/^t[0-9]_/, '');\n};\n\nconst clean = txt => (txt || '').replace(/\\s*\\n\\s*/g, ' ').trim();\n\n// Decide canonical UID for this row\nconst getUID = j => {\n if (j.uid) return String(j.uid);\n if (j.comment_id) return stripPrefix(j.comment_id);\n if (j.object_id) return stripPrefix(j.object_id);\n // Fallback: posts sometimes only have post_id\n if (j.post_id) return stripPrefix(j.post_id);\n return null;\n};\n\n// Decide canonical parent UID\nconst getParentUID = j => {\n if (j.parent_uid) return String(j.parent_uid);\n if (j.parent_id) return stripPrefix(j.parent_id);\n\n // New export case:\n // chunk_type === \"comment\" (or depth >=0) but parent_id missing -> assume post_id is parent\n const isPost = (j.chunk_type === 'post') || (j.depth != null && Number(j.depth) < 0);\n if (!isPost && j.post_id) return stripPrefix(j.post_id);\n\n // Root posts -> null\n return null;\n};\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 1. build node map \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nconst map = new Map(); // uid -> node\nconst roots = [];\n\nfor (const it of items) {\n const j = it.json;\n if (!j.body || !j.body.trim()) continue; // skip empty\n\n const uid = getUID(j);\n if (!uid) continue; // cannot index, skip row\n\n const parent_uid = getParentUID(j);\n\n const node = {\n uid,\n parent_uid,\n body: clean(j.body),\n created: j.created_utc,\n children: [],\n // keep raw fields if needed downstream\n _raw: j,\n };\n\n map.set(uid, node);\n}\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 2. link parents & children \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nfor (const node of map.values()) {\n if (node.parent_uid && map.has(node.parent_uid)) {\n map.get(node.parent_uid).children.push(node);\n } else {\n // no known parent in this batch -> treat as root post\n roots.push(node);\n }\n}\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 2b. ensure posts sorted before comments when multiple roots\n// optional: group by original post_id if available\n// (skip if you are happy letting multiple orphan comments become separate roots)\n\n// sort children chronologically\nconst byDate = (a, b) => {\n const da = a.created ? new Date(a.created).getTime() : 0;\n const db = b.created ? new Date(b.created).getTime() : 0;\n return da - db;\n};\nconst sortTree = n => { n.children.sort(byDate); n.children.forEach(sortTree); };\nroots.forEach(sortTree);\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 3. stringify the thread \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nconst buildString = (n, indent = '') => {\n const prefix = indent ? '- ' : 'POST: ';\n let out = indent + prefix + n.body + '\\n';\n for (const c of n.children) out += buildString(c, indent + ' ');\n return out;\n};\n\n// \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 4. emit one item per root \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nreturn roots.map(r => ({\n json: {\n post_id: r._raw?.post_id || r.uid,\n thread_text: buildString(r).trim(),\n },\n}));"
},
"typeVersion": 2
},
{
"id": "54d0d414-a002-44b7-b1b7-7980782165dc",
"name": "Merge: Thread + Post Details",
"type": "n8n-nodes-base.merge",
"position": [
4288,
-416
],
"parameters": {
"mode": "combine",
"options": {},
"combineBy": "combineByPosition"
},
"typeVersion": 3.2
},
{
"id": "3c37fad6-9320-408b-9686-92337dca5d3a",
"name": "Set (id, thread_text, link)",
"type": "n8n-nodes-base.set",
"position": [
4512,
-256
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "0c77ff7e-681e-43e1-a70e-09ddac37d6a5",
"name": "id",
"type": "string",
"value": "={{ $json.id }}"
},
{
"id": "e1f70c7c-98c6-4da8-86a4-6e6fc19c018e",
"name": "thread_text",
"type": "string",
"value": "={{ $json.thread_text }}"
},
{
"id": "5b65a8d5-88c5-4d0e-81d5-e873a751d38c",
"name": "link",
"type": "string",
"value": "={{ $json.url }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "85340b98-fcdb-4251-8dc8-551e81d0a2f3",
"name": "Call Sub-workflow: Summarize & Email",
"type": "n8n-nodes-base.executeWorkflow",
"position": [
2512,
96
],
"parameters": {
"options": {},
"workflowId": {
"__rl": true,
"mode": "id",
"value": "twvLZRSedaF7hjy2"
},
"workflowInputs": {
"value": {
"id": "={{ $json.id }}",
"link": "={{ $json.link }}",
"email": "={{ $('Set Topic, Subreddits and Email Address').first().json.email }}",
"topic": "={{ $('Set Topic, Subreddits and Email Address').first().json['topic'] }}",
"thread_text": "={{ $json.thread_text }}"
},
"schema": [
{
"id": "topic",
"type": "string",
"display": true,
"required": false,
"displayName": "topic",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "id",
"type": "string",
"display": true,
"required": false,
"displayName": "id",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "thread_text",
"type": "string",
"display": true,
"required": false,
"displayName": "thread_text",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "link",
"type": "string",
"display": true,
"required": false,
"displayName": "link",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "email",
"type": "string",
"display": true,
"removed": false,
"required": false,
"displayName": "email",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "defineBelow",
"matchingColumns": [],
"attemptToConvertTypes": false,
"convertFieldsToString": true
}
},
"typeVersion": 1.2
},
{
"id": "0911fcd5-3fa1-44f9-88ae-852939c26bf5",
"name": "Sub-workflow Trigger",
"type": "n8n-nodes-base.executeWorkflowTrigger",
"position": [
2512,
368
],
"parameters": {
"workflowInputs": {
"values": [
{
"name": "topic"
},
{
"name": "id"
},
{
"name": "thread_text"
},
{
"name": "link"
},
{
"name": "email"
}
]
}
},
"typeVersion": 1.1
},
{
"id": "5ca4c51f-bd8c-4861-bf2f-26d4bcf343e1",
"name": "Extract Link",
"type": "n8n-nodes-base.set",
"position": [
3040,
272
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "a8042f2e-2fdc-4209-bbeb-4c4a689c651f",
"name": "link",
"type": "string",
"value": "={{ $json.link }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "d315e9d1-993d-444b-abae-8d23a77a8000",
"name": "Extract Thread Text",
"type": "n8n-nodes-base.set",
"position": [
2736,
464
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "c66e0f4a-9293-4283-828c-85859225b231",
"name": "thread_text",
"type": "string",
"value": "={{ $json.thread_text }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "148cdd3b-679a-4ec7-ac5e-61b1775d6465",
"name": "GPT-4o mini",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenRouter",
"position": [
3904,
592
],
"parameters": {
"model": "openai/gpt-4o-mini",
"options": {}
},
"credentials": {
"openRouterApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "8bb8fddb-de27-4a35-a6e5-9045daf856dd",
"name": "Summarize Threads",
"type": "@n8n/n8n-nodes-langchain.chainSummarization",
"position": [
2960,
464
],
"parameters": {
"options": {}
},
"typeVersion": 2.1
},
{
"id": "c0f55602-75a0-4783-b6a4-dd21a03486d4",
"name": "Combine Summaries + Links",
"type": "n8n-nodes-base.merge",
"position": [
3360,
368
],
"parameters": {
"mode": "combine",
"options": {},
"combineBy": "combineByPosition"
},
"typeVersion": 3.2
},
{
"id": "9f8ecb80-43e2-477c-a727-18a9c5463bd5",
"name": "Aggregate Summaries & Links",
"type": "n8n-nodes-base.aggregate",
"position": [
3584,
368
],
"parameters": {
"options": {},
"fieldsToAggregate": {
"fieldToAggregate": [
{
"fieldToAggregate": "output.text"
},
{
"fieldToAggregate": "link"
}
]
}
},
"typeVersion": 1
},
{
"id": "de10067c-e42e-4f75-ad61-92a190422d54",
"name": "Format HTML for Gmail",
"type": "@n8n/n8n-nodes-langchain.chainLlm",
"position": [
3808,
368
],
"parameters": {
"text": "=## INPUT:\nYou will receive:\n- `text`: a JSON array of Reddit thread summaries\n- `link`: a JSON array of Reddit post URLs\n\nThese arrays are of equal length, and `text[n]` corresponds to `link[n]`.\n\n## TASK:\nFormat the matched items into **HTML** for a Gmail-compatible email. Use the structure below:\n\n```\n\n<h1>Summary</h1>\n\n<h2>Summarized One-liner Title from TEXT_1</h2>\n<p>TEXT_1</p>\n<p><a href=\"LINK_1\">View Reddit Thread</a></p>\n\n<br /><br />\n\n<h2>Summarized One-liner Title from TEXT_2</h2>\n<p>TEXT_2</p>\n<p><a href=\"LINK_2\">View Reddit Thread</a></p>\n\n... and so on\n\n```\n\n## RULES:\n- Do NOT wrap the entire thing in `<html>` or `<body>`.\n- Ensure proper spacing and line breaks between sections using `<p>` or `<br />`.\n- Hyperlink formatting must be clean and click-friendly.\n- All content must be Gmail-safe (no external CSS, JS, or fancy HTML).\n- DO NOT include any extraneous commentary or explanation \u2014 just return the HTML block.\n\n## INPUT:\nList of summarized reddit threads: {{ $json.text }}\n\nList of reddit links: {{ $json.link }}\n\nReturn the result as clean HTML only.\n",
"batching": {},
"messages": {
"messageValues": [
{
"message": "=You are a world-class AI tasked with formatting content for HTML email rendering in Gmail."
}
]
},
"promptType": "define"
},
"typeVersion": 1.7
},
{
"id": "c4dbcf94-b82f-47f3-9185-1b1e3ae1911a",
"name": "Send Digest",
"type": "n8n-nodes-base.gmail",
"position": [
4208,
368
],
"parameters": {
"sendTo": "={{ $('Sub-workflow Trigger').first().json.email }}",
"message": "={{ $json.text }}",
"options": {
"appendAttribution": false
},
"subject": "={{ $('Sub-workflow Trigger').first().json.topic }} {{ 'Daily Digest' }}"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "d7d8c4bc-a9bc-4c1f-8046-890611abfaee",
"name": "Set Topic, Subreddits and Email Address",
"type": "n8n-nodes-base.set",
"position": [
512,
-192
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "b62e1476-3762-49dc-ac77-fd676bf7aa61",
"name": "topic",
"type": "string",
"value": "Investing"
},
{
"id": "fc74917a-193d-44fd-879e-c3c6e2156c67",
"name": "subreddits",
"type": "array",
"value": "=[\"investing\", \"stocks\"]"
},
{
"id": "673498be-f268-44aa-8f3a-da75cc8bd50d",
"name": "email",
"type": "string",
"value": "user@example.com"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "99d1e0af-32e9-4e33-a40d-642db28d3d6f",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
-544
],
"parameters": {
"color": 5,
"width": 624,
"height": 256,
"content": "\n**Start here (required settings)**\n\n* **1) Schedule**: Open **Schedule Trigger** and choose your run time. If times look off, set **Workflow Settings \u2192 Timezone**.\n* **2) Topic and subreddits**: Open **Set Topic & Subreddits** and set:\n\n * `topic`: a short label for your digest (example: Investing)\n * `subreddits`: array of subreddit names (example: `[\"investing\",\"stocks\"]`)\n * `email`: your gmail (example: john@gmail.com)"
},
"typeVersion": 1
},
{
"id": "88a4e517-fc50-4128-8160-e0acd34ea87b",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
-256
],
"parameters": {
"width": 624,
"height": 176,
"content": "\n**What this workflow does**\n\n* Fetch **hot** posts per subreddit, normalize dates, filter to **last 24h** and **score > 30**, then sort by score.\n* Build a **thread text** from the post and main comments.\n* **Summarize** each thread with an LLM and **send one Gmail digest**.\n"
},
"typeVersion": 1
},
{
"id": "f4c542ec-a961-4e0e-b913-accbb5544c80",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
-48
],
"parameters": {
"width": 624,
"height": 208,
"content": "**Customize**\n\n* Change score threshold in **Filter: Last 24h & Score > 30**.\n* Add or remove subreddits anytime in **Set Topic, Subreddits, and Email Address**.\n* To reduce email length, place a **Limit** node before summarization.\n* Respect Reddit API and Gmail limits if you scale up."
},
"typeVersion": 1
},
{
"id": "7f1dffb8-95eb-4949-aa18-9c1efd7ae820",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"position": [
-656,
192
],
"parameters": {
"width": 624,
"height": 560,
"content": "## Start here: Step-by Step Youtube Tutorial :star:\nWatch this to ensure you configure the workflow correctly\n\n[](https://youtu.be/H6tMJ0-a9RY)\n"
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"timezone": "Asia/Singapore",
"callerPolicy": "workflowsFromSameOwner",
"executionOrder": "v1"
},
"versionId": "de790c1b-fe57-4962-8b0e-6fb74880e57b",
"connections": {
"GPT-4o mini": {
"ai_languageModel": [
[
{
"node": "Summarize Threads",
"type": "ai_languageModel",
"index": 0
},
{
"node": "Format HTML for Gmail",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Extract Link": {
"main": [
[
{
"node": "Combine Summaries + Links",
"type": "main",
"index": 1
}
]
]
},
"Get Post by ID": {
"main": [
[
{
"node": "Deduplicate by ID",
"type": "main",
"index": 0
}
]
]
},
"List Hot Posts": {
"main": [
[
{
"node": "Normalize Post Date (created_utc \u2192 ISO)",
"type": "main",
"index": 0
},
{
"node": "Attach ISO Date to Posts1",
"type": "main",
"index": 1
}
]
]
},
"Build Thread Text": {
"main": [
[
{
"node": "Merge: Thread + Post Details",
"type": "main",
"index": 0
}
]
]
},
"Deduplicate by ID": {
"main": [
[
{
"node": "Build Post Body (root)",
"type": "main",
"index": 0
}
]
]
},
"Summarize Threads": {
"main": [
[
{
"node": "Combine Summaries + Links",
"type": "main",
"index": 0
}
]
]
},
"Extract Thread Text": {
"main": [
[
{
"node": "Summarize Threads",
"type": "main",
"index": 0
}
]
]
},
"Schedule: Daily run": {
"main": [
[
{
"node": "Set Topic, Subreddits and Email Address",
"type": "main",
"index": 0
}
]
]
},
"Sort by Score (desc)": {
"main": [
[
{
"node": "Iterate Posts (single batch)",
"type": "main",
"index": 0
}
]
]
},
"Split Subreddit List": {
"main": [
[
{
"node": "List Hot Posts",
"type": "main",
"index": 0
}
]
]
},
"Sub-workflow Trigger": {
"main": [
[
{
"node": "Extract Link",
"type": "main",
"index": 0
},
{
"node": "Extract Thread Text",
"type": "main",
"index": 0
}
]
]
},
"Format HTML for Gmail": {
"main": [
[
{
"node": "Send Digest",
"type": "main",
"index": 0
}
]
]
},
"Build Post Body (root)": {
"main": [
[
{
"node": "Append Posts + Comments",
"type": "main",
"index": 0
},
{
"node": "List Top-level Comments",
"type": "main",
"index": 0
}
]
]
},
"Filter: Valid Comments": {
"main": [
[
{
"node": "Append Posts + Comments",
"type": "main",
"index": 1
}
]
]
},
"Append Posts + Comments": {
"main": [
[
{
"node": "Build Thread Text",
"type": "main",
"index": 0
}
]
]
},
"Flatten Comment Threads": {
"main": [
[
{
"node": "Filter: Valid Comments",
"type": "main",
"index": 0
}
]
]
},
"List Top-level Comments": {
"main": [
[
{
"node": "Flatten Comment Threads",
"type": "main",
"index": 0
}
]
]
},
"Attach ISO Date to Posts1": {
"main": [
[
{
"node": "Select Fields (id, score, url, date, subreddit)",
"type": "main",
"index": 0
}
]
]
},
"Combine Summaries + Links": {
"main": [
[
{
"node": "Aggregate Summaries & Links",
"type": "main",
"index": 0
}
]
]
},
"Aggregate Summaries & Links": {
"main": [
[
{
"node": "Format HTML for Gmail",
"type": "main",
"index": 0
}
]
]
},
"Set (id, thread_text, link)": {
"main": [
[
{
"node": "Iterate Posts (single batch)",
"type": "main",
"index": 0
}
]
]
},
"Iterate Posts (single batch)": {
"main": [
[
{
"node": "Call Sub-workflow: Summarize & Email",
"type": "main",
"index": 0
}
],
[
{
"node": "Merge: Thread + Post Details",
"type": "main",
"index": 1
},
{
"node": "Get Post by ID",
"type": "main",
"index": 0
}
]
]
},
"Merge: Thread + Post Details": {
"main": [
[
{
"node": "Set (id, thread_text, link)",
"type": "main",
"index": 0
}
]
]
},
"Filter: Last 24h & Score > 30": {
"main": [
[
{
"node": "Sort by Score (desc)",
"type": "main",
"index": 0
}
]
]
},
"Set Topic, Subreddits and Email Address": {
"main": [
[
{
"node": "Split Subreddit List",
"type": "main",
"index": 0
}
]
]
},
"Normalize Post Date (created_utc \u2192 ISO)": {
"main": [
[
{
"node": "Attach ISO Date to Posts1",
"type": "main",
"index": 0
}
]
]
},
"Select Fields (id, score, url, date, subreddit)": {
"main": [
[
{
"node": "Filter: Last 24h & Score > 30",
"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.
gmailOAuth2openRouterApiredditOAuth2Api
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
What it does
Source: https://n8n.io/workflows/7162/ — original creator credit. Request a take-down →
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