{"workflow":{"id":12812,"name":"Turn a YouTube channel into a second brain with Neo4j GraphRAG and GPT-4o-mini","views":372,"recentViews":1,"totalViews":372,"createdAt":"2026-01-19T09:45:26.109Z","description":"### AI-powered \"Second Brain\" that can answer questions about any YouTube channel's content using Neo4j Graph Database and RAG.\n\nTurn any YouTube channel into a searchable knowledge base. The AI agent understands relationships between videos, topics, tools, and concepts - enabling powerful queries like \"Which videos talk about automation AND mention n8n?\" or \"What are the most discussed topics?\".\n\n**Good to know**\n\n* Neo4j Aura Free Tier is sufficient for most channels (up to 200k nodes)\n* Apify credits are required for YouTube scraping (~$5 for 500 videos)\n* LLM costs are minimal (~$0.01 per video for entity extraction)\n\n### How it works\n\n* **Ingestion Flow**: Scrapes YouTube videos via Apify, including titles, descriptions, and transcripts.\n* **Entity Extraction**: GPT-4o-mini analyzes each video and extracts Topics, Tools, and Concepts mentioned.\n* **Graph Storage**: Data is stored in Neo4j with relationships: Video → COVERS → Topic, Video → USES → Tool, Video → EXPLAINS → Concept.\n* **AI Agent**: Receives user questions, generates Cypher queries to search the graph, and returns natural language responses with relevant video links.\n\n### How to use\n\n1. Set up a free Neo4j Aura instance and save credentials\n2. Convert your Neo4j username:password to Base64 for authentication\n3. Configure Apify with your target YouTube channel URL\n4. Run the ingestion workflow to populate the database\n5. Chat with the AI agent to query your video knowledge base\n\n### Requirements\n\n* Neo4j Aura account (free tier available)\n* Apify account for YouTube scraping\n* OpenAI API key (GPT-4o-mini) for entity extraction\n* Anthropic API key (Claude) or OpenAI for the AI agent\n\n### Customization\n\n* Modify the system prompt to change response style or language\n* Add more entity types (e.g., People, Companies, Frameworks)\n* Connect multiple YouTube channels into one knowledge base\n* Extend to other content sources (blogs, podcasts, Notion docs)","workflow":{"id":"FoooqLnoNApWemAG","meta":{"instanceId":"8a504c330a8af367d7ed05b4044a4b4aaee4fb455a8108bad06ec0352cc67ada","templateCredsSetupCompleted":true},"name":"GraphRAG with Neo4j | Second cerveau à partir d'une chaîne youtube","tags":[],"nodes":[{"id":"1111e006-bac2-4015-b1f5-229bab094434","name":"4.1 mini","type":"@n8n/n8n-nodes-langchain.lmChatOpenRouter","position":[1440,640],"parameters":{"options":{}},"credentials":{"openRouterApi":{"id":"khAEVU7iAlpe9jz2","name":"OpenRouter account - Hugo"}},"typeVersion":1},{"id":"8435fa26-e11a-482b-b3eb-c3e662739fc4","name":"Catégorie définition Agent","type":"@n8n/n8n-nodes-langchain.agent","position":[1136,208],"parameters":{"text":"=Titre : {{ $json.title }}\nDescription : {{ $json.text || $json.translatedText }}\nTranscrit : {{ $json.subtitles[0].plaintext }}","options":{"systemMessage":"Tu es un extracteur d'entités pour des vidéos YouTube francophones sur le business, l'entrepreneuriat et la tech.\n\nAnalyse le titre, la description et le transcript de la vidéo et extrais :\n\n1. **topics** : Sujets/thématiques abordés (ex: entrepreneuriat, investissement, productivité, marketing digital)\n\n2. **tools** : Outils, logiciels, plateformes, services mentionnés (ex: n8n, chat gpt, notion, stripe, shopify, tiktok)\n\n3. **concepts** : Concepts, méthodes, stratégies, modèles business expliqués (ex: dropshipping, copywriting, funnel de vente, personal branding)\n\nRÈGLES :\n- Extrais uniquement ce qui est EXPLICITEMENT mentionné\n- Normalise en lowercase\n- Pas de doublons\n- Maximum 15 items par catégorie\n- Priorise les éléments les plus importants/récurrents\n\nRÉPONDS UNIQUEMENT en JSON valide, sans markdown, sans commentaires :\n{\"topics\":[],\"tools\":[],\"concepts\":[]}"},"promptType":"define","needsFallback":true,"hasOutputParser":true},"typeVersion":3},{"id":"75532cab-739f-41af-bf1f-0a596a332b3b","name":"4o mini","type":"@n8n/n8n-nodes-langchain.lmChatOpenRouter","position":[1104,432],"parameters":{"model":"openai/gpt-4o-mini","options":{"temperature":0.1}},"credentials":{"openRouterApi":{"id":"khAEVU7iAlpe9jz2","name":"OpenRouter account - Hugo"}},"typeVersion":1},{"id":"09bb672b-a246-43a3-9deb-a409c7b84bf0","name":"sonnet 3.5","type":"@n8n/n8n-nodes-langchain.lmChatOpenRouter","position":[1232,432],"parameters":{"model":"anthropic/claude-3.5-sonnet","options":{}},"credentials":{"openRouterApi":{"id":"khAEVU7iAlpe9jz2","name":"OpenRouter account - Hugo"}},"typeVersion":1},{"id":"bf0d5e00-3dd3-4b27-b3fa-cc655bcbc57f","name":"If","type":"n8n-nodes-base.if","position":[880,336],"parameters":{"options":{},"conditions":{"options":{"version":3,"leftValue":"","caseSensitive":true,"typeValidation":"strict"},"combinator":"and","conditions":[{"id":"cf8baa79-e04f-4a73-bdd9-c416b9469ec6","operator":{"type":"string","operation":"exists","singleValue":true},"leftValue":"={{ $json.title }}","rightValue":""},{"id":"961b4941-52f0-45fa-be53-ccdd2bccddd8","operator":{"type":"string","operation":"exists","singleValue":true},"leftValue":"={{ $json.text || $json.translatedText }}","rightValue":""},{"id":"07dae331-c7f0-4442-b81a-53534be89cfd","operator":{"type":"string","operation":"exists","singleValue":true},"leftValue":"={{ $json.subtitles[0].plaintext }}","rightValue":""}]}},"typeVersion":2.3},{"id":"201648c3-67aa-45e2-8156-264b7becc008","name":"AI Agent","type":"@n8n/n8n-nodes-langchain.agent","position":[2272,288],"parameters":{"options":{"systemMessage":"Tu es un assistant expert sur le contenu d'une chaîne YouTube sur le business et l'entrepreneuriat.\n\nTu as accès à une base de données Neo4j contenant toutes les vidéos de la chaîne avec leurs sujets, outils et concepts.\n\nSCHEMA DU GRAPH :\n- (Video) : videoId, title, url, publishedAt, viewCount, duration, channelName\n- (Topic) : name (sujets abordés)\n- (Tool) : name (outils mentionnés)\n- (Concept) : name (concepts expliqués)\n\nRELATIONS :\n- (Video)-[:COVERS]->(Topic)\n- (Video)-[:USES]->(Tool)\n- (Video)-[:EXPLAINS]->(Concept)\n\nCOMMENT UTILISER LE TOOL NEO4J :\nQuand l'utilisateur pose une question sur les vidéos, utilise le tool \"neo4j_query\" avec un body JSON contenant ta query Cypher.\n\nFORMAT DU BODY :\n{\n  \"statement\": \"TA_QUERY_CYPHER_ICI\"\n}\n\nEXEMPLES DE QUERIES :\n\n1. Chercher des vidéos par sujet :\n{\"statement\": \"MATCH (v:Video)-[:COVERS]->(t:Topic) WHERE toLower(t.name) CONTAINS 'dropshipping' RETURN v.title AS title, v.url AS url LIMIT 10\"}\n\n2. Chercher des vidéos par outil :\n{\"statement\": \"MATCH (v:Video)-[:USES]->(tool:Tool) WHERE toLower(tool.name) CONTAINS 'chatgpt' RETURN v.title AS title, v.url AS url LIMIT 10\"}\n\n3. Top outils les plus mentionnés :\n{\"statement\": \"MATCH (v:Video)-[:USES]->(tool:Tool) RETURN tool.name AS tool, count(v) AS mentions ORDER BY mentions DESC LIMIT 10\"}\n\n4. Top concepts expliqués :\n{\"statement\": \"MATCH (v:Video)-[:EXPLAINS]->(c:Concept) RETURN c.name AS concept, count(v) AS mentions ORDER BY mentions DESC LIMIT 10\"}\n\n5. Vidéos avec plusieurs critères (AND) :\n{\"statement\": \"MATCH (v:Video)-[:COVERS]->(t:Topic), (v)-[:USES]->(tool:Tool) WHERE toLower(t.name) CONTAINS 'ecommerce' AND toLower(tool.name) CONTAINS 'shopify' RETURN v.title AS title, v.url AS url LIMIT 10\"}\n\n6. Toutes les vidéos :\n{\"statement\": \"MATCH (v:Video) RETURN v.title AS title, v.url AS url, v.viewCount AS views ORDER BY v.viewCount DESC LIMIT 10\"}\n\n7. Lister tous les topics/tools/concepts :\n{\"statement\": \"MATCH (t:Topic) RETURN DISTINCT t.name AS topic\"}\n\nRÈGLES :\n- Utilise TOUJOURS toLower() et CONTAINS pour les recherches texte (gère les variations)\n- Limite toujours à 10 résultats sauf si l'utilisateur demande plus\n- Retourne TOUJOURS title et url pour les vidéos\n- Réponds en français de manière naturelle et concise\n- Formate les liens en markdown : [Titre de la vidéo](url)\n- Si aucun résultat, suggère des termes de recherche alternatifs"},"needsFallback":true},"typeVersion":3},{"id":"94b2f1c2-fe48-4a62-b3d1-01c501b16d72","name":"When chat message received","type":"@n8n/n8n-nodes-langchain.chatTrigger","position":[2096,288],"webhookId":"e686a4fa-d2ec-4180-a081-a93bb13d1733","parameters":{"options":{"responseMode":"responseNodes"}},"typeVersion":1.4},{"id":"4ee455ee-8c76-46a6-9af9-57e52bb64efe","name":"4o","type":"@n8n/n8n-nodes-langchain.lmChatOpenRouter","position":[2208,480],"parameters":{"model":"openai/chatgpt-4o-latest","options":{"temperature":0.1}},"credentials":{"openRouterApi":{"id":"khAEVU7iAlpe9jz2","name":"OpenRouter account - Hugo"}},"typeVersion":1},{"id":"b4d72802-f7c9-4774-a517-20dad5d7cb1b","name":"sonnet 4.5","type":"@n8n/n8n-nodes-langchain.lmChatOpenRouter","position":[2320,480],"parameters":{"model":"anthropic/claude-sonnet-4.5","options":{}},"credentials":{"openRouterApi":{"id":"khAEVU7iAlpe9jz2","name":"OpenRouter account - Hugo"}},"typeVersion":1},{"id":"f9bb0cb6-d2d4-40eb-b5e0-cb7ecdf241ee","name":"Simple Memory","type":"@n8n/n8n-nodes-langchain.memoryBufferWindow","position":[2448,480],"parameters":{"contextWindowLength":10},"typeVersion":1.3},{"id":"ac46630f-88d6-4189-958a-0cdec6005d00","name":"Respond to Chat","type":"@n8n/n8n-nodes-langchain.chat","position":[2624,288],"parameters":{"message":"={{ $json.output }}","options":{}},"typeVersion":1},{"id":"ceff4090-08f5-4824-9b22-b14200c6ad95","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[-128,-112],"parameters":{"color":5,"width":2992,"height":880,"content":"## 📥 Video Ingestion\n\nScrapes YouTube videos via Apify, extracts entities with GPT-4o-mini, and stores everything in Neo4j."},"typeVersion":1},{"id":"c9e42c1b-722b-496a-b40d-151aa97cd83e","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[2000,144],"parameters":{"color":7,"width":848,"height":496,"content":"## 5. 🤖 Ask the Database for relation with LLM augmented analysis\n\nReceives user questions, generates Cypher queries via the Neo4j tool, and returns a natural response with relevant videos."},"typeVersion":1},{"id":"e42f4902-7feb-4d04-a1ac-c0ed9d9f3599","name":"neo4j_query","type":"n8n-nodes-base.httpRequestTool","position":[2640,464],"parameters":{"url":"https://4b095dfe.databases.neo4j.io/db/neo4j/query/v2","method":"POST","options":{},"jsonBody":"={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('JSON', ``, 'json') }}","sendBody":true,"sendHeaders":true,"specifyBody":"json","authentication":"genericCredentialType","genericAuthType":"httpHeaderAuth","toolDescription":"Exécute une query Cypher sur la base Neo4j pour chercher des vidéos, topics, tools ou concepts","headerParameters":{"parameters":[{"name":"Content-Type","value":"Application/json"}]}},"credentials":{"httpHeaderAuth":{"id":"xdFHG3NmTK6imALL","name":"Neo4j"}},"typeVersion":4.3},{"id":"f472eb4e-ac35-49e0-8bed-259dc3620c0a","name":"Parseur","type":"@n8n/n8n-nodes-langchain.outputParserStructured","position":[1360,432],"parameters":{"autoFix":true,"jsonSchemaExample":"{\n  \"topics\": [\"business\", \"entrepreneuriat\", \"débutants\", \"2026\", \"revenus\"],\n  \"tools\": [\"chat gpt\", \"n8n\", \"hostinger\", \"tiktok shop\", \"google maps\"],\n  \"concepts\": [\"dropshipping\", \"freelance\", \"ugc\", \"automatisation\", \"coaching\", \"saas\", \"e-commerce\", \"closer\", \"drop servicing\"]\n}"},"typeVersion":1.3},{"id":"8996cff2-eea2-4377-be43-826f6d8a5532","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[-848,-112],"parameters":{"width":720,"height":880,"content":"# GraphRAG with Neo4j | Second Brain YouTube\n\n### How it works\nThis AI agent queries a Neo4j database containing all videos from a YouTube channel. Videos are enriched with **topics**, **tools** and **concepts** automatically extracted by an LLM. The agent generates Cypher queries to answer questions about the channel's content.\n\n### Setup steps\n1. Create a Neo4j Aura instance (free tier) and save the credentials\n2. Configure HTTP Header Auth credential with `Authorization: Basic [base64]`\n3. Run the ingestion workflow to populate the database with your videos\n4. Test the agent via the built-in chat\n\n### Customization\n- Modify the system prompt to adapt the response tone\n- Add additional relations (e.g., RELATED_TO between topics)\n- Connect to other sources (Notion, blog posts, etc.)\n- Modify the form input for more control over video filtering"},"typeVersion":1},{"id":"47cc9de7-b485-4ee9-a0df-8e1f693c74e3","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[1696,256],"parameters":{"color":3,"width":256,"height":352,"content":"##  ⚠️ Credentials\nMake sure you converted your username:password combination into a Base64 string. \n\nYou can use this site : [Base64 Encode](https://www.base64encode.org/)"},"typeVersion":1},{"id":"4fb6e349-751d-43e7-9199-877b4ea8c131","name":"Vers Neo4j","type":"n8n-nodes-base.httpRequest","onError":"continueErrorOutput","position":[1760,432],"parameters":{"url":"https://4b095dfe.databases.neo4j.io/db/neo4j/query/v2","method":"POST","options":{},"jsonBody":"={\n  \"statement\": \"MERGE (v:Video {videoId: $videoId}) SET v.title = $title, v.url = $url, v.publishedAt = $publishedAt, v.viewCount = $viewCount, v.duration = $duration, v.channelName = $channelName WITH v UNWIND $topics AS topicName MERGE (t:Topic {name: topicName}) MERGE (v)-[:COVERS]->(t) WITH v UNWIND $tools AS toolName MERGE (tool:Tool {name: toolName}) MERGE (v)-[:USES]->(tool) WITH v UNWIND $concepts AS conceptName MERGE (c:Concept {name: conceptName}) MERGE (v)-[:EXPLAINS]->(c)\",\n  \"parameters\": {\n    \"videoId\": \"{{ $('Scraping of each URLs').item.json.id }}\",\n    \"title\": \"{{ $('Scraping of each URLs').item.json.title }}\",\n    \"url\": \"{{ $('Scraping of each URLs').item.json.url }}\",\n    \"publishedAt\": \"{{ $('Scraping of each URLs').item.json.date }}\",\n    \"viewCount\": {{ $('Scraping of each URLs').item.json.viewCount }},\n    \"duration\": \"{{ $('Scraping of each URLs').item.json.duration }}\",\n    \"channelName\": \"{{ $('Scraping of each URLs').item.json.channelName }}\",\n    \"topics\": {{ JSON.stringify($json.output.topics) }},\n    \"tools\": {{ JSON.stringify($json.output.tools) }},\n    \"concepts\": {{ JSON.stringify($json.output.concepts) }}\n  }\n}\n\n","sendBody":true,"sendHeaders":true,"specifyBody":"json","authentication":"genericCredentialType","genericAuthType":"httpHeaderAuth","headerParameters":{"parameters":[{"name":"Accept","value":"application/json"}]}},"credentials":{"httpHeaderAuth":{"id":"xdFHG3NmTK6imALL","name":"Neo4j"}},"typeVersion":4.3},{"id":"7b9fea92-c4e7-4794-bc59-a6ff9b75fb30","name":"Sticky Note4","type":"n8n-nodes-base.stickyNote","position":[-64,192],"parameters":{"color":7,"width":1104,"height":304,"content":"## 1. Scrape Channel & Video URLs\n\nFetches the YouTube channel and retrieves all video URLs using Apify YouTube Scraper."},"typeVersion":1},{"id":"e1c58b5f-5e13-44c0-a313-91217efdce4c","name":"Sticky Note5","type":"n8n-nodes-base.stickyNote","position":[1056,80],"parameters":{"color":7,"width":592,"height":672,"content":"## 2. Extract Concepts, Tools, Topics\n\nLLM analyzes title, description & transcript to extract structured entities (Topics, Tools, Concepts) as JSON."},"typeVersion":1},{"id":"7ef94294-6a37-439d-bbe1-fe687437a945","name":"Sticky Note6","type":"n8n-nodes-base.stickyNote","position":[1664,64],"parameters":{"color":7,"width":320,"height":576,"content":"## 3. Input into Neo4j database\n\nSends extracted data to Neo4j, creating Video nodes and relationships to Topics, Tools, and Concepts."},"typeVersion":1},{"id":"06fc6d3d-7c69-4100-8683-28f7ff6d104b","name":"Sticky Note7","type":"n8n-nodes-base.stickyNote","position":[736,-48],"parameters":{"color":7,"width":310,"height":224,"content":"## 4. Show completion screen\n"},"typeVersion":1},{"id":"69837a64-3442-4832-ac5f-4f725f38e180","name":"Sticky Note8","type":"n8n-nodes-base.stickyNote","position":[2864,-112],"parameters":{"color":2,"width":752,"height":880,"content":"## 📊 Output - Neo4j Dashboard & AI Chat\n\nThis workflow produces:\n\n**1. Knowledge Graph Database**\n- Videos, Topics, Tools & Concepts as nodes\n- Relationships showing what each video covers, uses & explains\n\n**2. Auto-Generated Dashboards**\n- Top tools & topics visualizations\n- Content relationship network\n- Tool co-occurrence analysis\n\n**3. Conversational AI Agent**\n- Ask natural language questions about the channel\n- Get video recommendations with direct links\n- Discover content patterns and insights\n\n![Dashboard Preview](https://bdcahdjartshknrvdnxq.supabase.co/storage/v1/object/public/gpt-images/neo4j_dash_1.png)\n![Dashboard Preview](https://bdcahdjartshknrvdnxq.supabase.co/storage/v1/object/public/gpt-images/neo4j-dash-2.png)"},"typeVersion":1},{"id":"d6212140-79d4-40b4-a4d9-a6ee728ccb04","name":"Wich creator ? How many videos ?","type":"n8n-nodes-base.formTrigger","position":[-16,320],"webhookId":"517ceb6a-191a-4374-883b-57fcf6b8bba7","parameters":{"options":{},"formTitle":"Quel youtubeur veux tu cloner ?","formFields":{"values":[{"fieldLabel":"URL","requiredField":true},{"fieldType":"number","fieldLabel":"Nombre de vidéos à récupérer ? 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