Show HN: Langchain and Node and React Explainer

I have been experimenting with Langchain and Javascript recently so I decided to document a simple web app using Node and React with Langchain.

The app has a simple interface for a user to upload a document and ask questions (csv, pdf, or txt). The server will forward the user's natural language query to an LLM (BYO API keys from OpenAI or Hugging Face) and the responses will have the context of the document. Hope you find this explainer helpful!