Tutorials

Below are links to tutorials and courses on LangChain.js. For written guides on common use cases for LangChain.js, check out the use cases and guides sections.

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Scrimba interactive guides

Scrimba is a code-learning platform that allows you to interactively edit and run code while watching a video walkthrough.

We've partnered with Scrimba on course materials (called "scrims") that teach the fundamentals of building with LangChain.js - check them out below, and check back for more as they become available!

Learn LangChain.js

• Learn LangChain.js on Scrimba

An full end-to-end course that walks through how to build a chatbot that can answer questions about a provided document. A great introduction to LangChain and a great first project for learning how to use LangChain Expression Language primitives to perform retrieval!

LangChain Expression Language (LCEL)

• The basics (PromptTemplate + LLM)
• Adding an output parser
• Attaching function calls to a model
• Composing multiple chains
• Retrieval chains
• Conversational retrieval chains ("Chat with Docs")

Deeper dives

• Setting up a new PromptTemplate
• Setting up ChatOpenAI parameters
• Attaching stop sequences

LangChain Expression Language Cheatsheet

For a quick reference for LangChain Expression Language, check out this overview/cheatsheet made by @zhanghaili0610:

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