title	Simple Langchain JS examples.
excerpt	Simple examples demonstrating how we can use basic Langchain functionalities..
Tools	Langchain ChromaBd Node Javascript Qwik

Simple LangchainJS examples

While I was learning Langchain using Python, it made sense to replicate those things in JS, since JS is my first language of preference and there is a JS version for Langchain, so I just created this repo with some JS samples.

What's Included

The repo has two folders:

• 'js-examples' - This contains some simple use cases of Langchain JS like :
  • Agent Example - How to use a Agent with tools that can interact with Database.
  • Chains Example - How to write a simple and sequential chain.
  • Loader - How to load a document and create embeddings to do some search on it.
• 'study-bot' - This is work under progress, this will be a simple study bot that helps you upload files, and than search them in a conversational manner. The FE will be build with Qwik and BE will be Node JS + Langchain JS.

Local Development

How to locally run the examples

All js-examples share the common package.json file so, first step is to install the deps, run the following commands:

 cd js-examples
 npm install

Now make sure you create a .env, for that you can re-name the .env.example and put in your OPEN AI key

Now you are all set to run different commands to execute different LLM interactions. Available commands are:

npm run run:agent npm run run:chain

NOTE for running the loader, we need to first start chroma server in a separate terminal (tried using wait-on and concurrently but did not work)

npm run start-db

In separate terminal run

npm run run:loader