📖 Turn a YouTube channel into a second brain with Neo4j GraphRAG and GPT-4o-mini
⚡ 199 views · 📖 Internal Wiki & Knowledge Base
💡 Pro Tip — YouTube’s API quotas can be a bottleneck when you’re pulling data at scale. ScraperNode is a community node with dedicated scrapers for channels, videos, and comments — no quota limits, just structured data.
Description
AI-powered “Second Brain” that can answer questions about any YouTube channel’s content using Neo4j Graph Database and RAG.
Turn 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?”.
Good to know
- Neo4j Aura Free Tier is sufficient for most channels (up to 200k nodes)
- Apify credits are required for YouTube scraping (~$5 for 500 videos)
- LLM costs are minimal (~$0.01 per video for entity extraction)
How it works
- Ingestion Flow: Scrapes YouTube videos via Apify, including titles, descriptions, and transcripts.
- Entity Extraction: GPT-4o-mini analyzes each video and extracts Topics, Tools, and Concepts mentioned.
- Graph Storage: Data is stored in Neo4j with relationships: Video → COVERS → Topic, Video → USES → Tool, Video → EXPLAINS → Concept.
- AI Agent: Receives user questions, generates Cypher queries to search the graph, and returns natural language responses with relevant video links.
How to use
- Set up a free Neo4j Aura instance and save credentials
- Convert your Neo4j username:password to Base64 for authentication
- Configure Apify with your target YouTube channel URL
- Run the ingestion workflow to populate the database
- Chat with the AI agent to query your video knowledge base
Requirements
- Neo4j Aura account (free tier available)
- Apify account for YouTube scraping
- OpenAI API key (GPT-4o-mini) for entity extraction
- Anthropic API key (Claude) or OpenAI for the AI agent
Customization
- Modify the system prompt to change response style or language
- Add more entity types (e.g., People, Companies, Frameworks)
- Connect multiple YouTube channels into one knowledge base
- Extend to other content sources (blogs, podcasts, Notion docs)
🔗 Nodes Used
HTTP Request, AI Agent, Simple Memory, Structured Output Parser, n8n Form Trigger, Chat Trigger
📥 Import
Download workflow.json and import into n8n:
Workflow menu → Import from File