LangChain JS Tutorial: with Gemini

I'm happy to share a beginner-friendly tutorial that walks through the core concepts of LangChain JS using Google Gemini as the LLM. This tutorial is divided into 5 focused parts, each available in a separate GitHub branch to help you learn step-by-step.

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Tutorial Structure

Each part of the tutorial is isolated in its own branch:

1. prompt – Creating dynamic prompt templates with variables
2. llm – Understanding and invoking LLMs using LangChain
3. llm-model – Using Gemini Flash 1.5 with LangChain JS
4. memory – Adding memory to retain conversation history
5. read-pdf – Reading PDFs and answering questions from the content

You can switch between these branches using:

git checkout prompt
git checkout llm
# etc.