Building Chatbots with Langchain and Node.js

Features

• Simple text chatbot with OpenAI API

Roadmap

• Chat from user's pdf file (in progress)
• Show user's message with response when returning a response
• Show previous messages when returning a response
• Chat from user's other documents (i.e txt, csv, html, etc)
• Chat from user's web page (i.e. url)

Installation

• Use node version 18.0.0 or higher.

1. Clone the repository

• run git clone https://github.com/fredygerman/chatbot-nodejs-langchain.git

2. Go to the very-simple-chatbot folder

• run cd generative-ai-meetup/very-simple-chatbot

3. Set up the environment variables

• run cp .env.example .env. or create a .env file and copy the contents of .env.example to .env.
• Go to your .env file and update the OPENAI_API_KEY value with your OpenAI API key. You can get your API key from here.

4. Install dependencies in package.json

• run npm install

5. Run the server

• run npm start.

Usage

1. Go to http://localhost:3169/api/chatbot?message=hi in your browser. Remember to replace hi with your message.

2. You should see a response like this:

{
    Human : hi
    Ai : Hello, how are you?
}

Note

Inspired by A presentation by @Kaleb at the Generative AI Tanzania meetup, here is the code which was used in his presentation.

I know it should be a very simple example but i mainly used a format of a project that i have been working on for a while. So this is ready for easy improvements and additions.

Please let me know if you would a much simple example. maybe a single file with just the code.

I will also be adding more comments to the code to make it easier to understand.

Any feedback and Contributions are welcome ❤️