Build AI Apps with LangChain.js

Overview

Learn the basics of LangChain.js and build an internal company knowledge base using retrieval from a vector database. This hands-on course takes you step by step through the process of building AI-powered applications using LangChain. You’ll start with an expert-led introduction by LangChain’s lead maintainer, Jacob Lee, giving you a strong foundation straight from the source. As you progress, you’ll: - Build app flow diagrams - Set up databases with Supabase - Refine text processing techniques - Craft powerful prompt templates - Develop starter code - Integrate logic chains for data retrieval and processing - Design a functional user interface—bringing your AI project to life Each module is designed to sharpen your coding skills with interactive challenges that push you to apply what you’ve learned in real-world scenarios. The course wraps up with an exciting solo project: building your own personal assistant app, solidifying your expertise in AI app development. With its deep focus on LangChain, this course gives you hands-on experience with cutting-edge AI tools, preparing you to build the next generation of intelligent applications.

Syllabus

Build AI apps with LangChain JS

In this module, you'll cover the foundational concepts of LangChain, setting up Supabase for data storage, and preparing text data for efficient processing.

Core Functionality & Processing

It's time to start building! You'll create retrieval chains, design prompt templates, structure outputs, and optimize workflows using RunnableSequence().

Challenges, UI, and Finalization

Finally, you'll focus on integrating a user interface, managing memory, troubleshooting performance issues, and ensuring scalability in LangChain applications.