LangChainJS Learning 01 CLI

Welcome to my LangChainJS repository implementation! This project is designed to provide a comprehensive guide to understanding and using LangChainJS, a powerful LLM Framework in a JavaScript library.

Table of Contents

• Introduction
• Getting Started
  • Installation
  • Environment Variable
• Quick Start
• Development Documentation

Introduction

This is my implementation of LangChainJS - An LLM Framework in a JavaScript library. Each lesson has notes, synopsis and questions for future lessons to answer and expand on. There are also several extra/side projects I was researching included in the folder.

The original tutorial playlist that I based on is linked here. I will also have the playlist displayed in case the hyperlink is not accessible https://youtube.com/playlist?list=PL4HikwTaYE0EG379sViZZ6QsFMjJ5Lfwj&si=o1vtvZ9lAB8sETbH.

Getting Started

I recommend running this project on NodeJS v20+. This project was originally running on NodeJS v21.7.1.

Installation

To get started, you need to download this project from Github and navigate to the project's folder.

cd langchainjs-learning-01-cli/

Dowloading the project's dependencies.

npm install
npm install nodemon --save-dev

Environment Variable

This step is important! Create an .env file to store your API KEY(s). These are the API KEY(s) you will need. Currently, in this project, I am using Google's Gemini API but you can change it to any LLM(s) you prefer.

GOOGLE_API_KEY=""
OPENAI_API_KEY=""
TAVILY_API_KEY=""
LANGFUSE_PUB=""
LANGFUSE_SEC=""

Quick Start

Run the project using the following command(s).

node .\src\<file name>.js

Development Documentation

Order by newest to oldest.

31/07/2024

• There was a test file on the OpenAI LLM, the folder was called legacyOpenAI.js, I deleted it because there was no use, nothing was working because nothing is free for OpenAI anymore.

12/06/2024

• Should change in package.json to "type":"module" first before downloading any npm packges. If you don't do this, you need to delete node_modules/, package-lock.json and wiping it clean. I remember reading this somewhere, forgot to noted it down.