Lets Build A Node.js ChatGPT-Like Bot With AI APIs
summary
Builds a Node.js RAG system using OpenAI models, LangChain, Express and Chroma vector DB, ingesting documents, chunking to embeddings and serving retrieval-augmented answers. Demo ingests Amazon shareholder letters and answers specific queries correctly; ChatGPT is cited as ~175 billion parameters. Notes cost and performance: stuffing a half‑terabyte into the context window is impractical, ingestion runs out of memory, and production fixes include async iterators and worker threads or S3 + queue consumers for scalable ingestion.
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chapters (8)
- 0:00Building a custom ChatGPT-like bot
- 1:08Understanding LLMs
- 5:44LLM building blocks
- 12:11Designing RAG architecture
- 16:30Code walkthrough
- 19:24Live demo with Amazon letters
- 22:13Scaling for performance
- 24:47Summary
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