Chat AI API

This is the backend for the Chat AI application. It is a Node/Express/TypeScript API that uses Stream for chat, chat history, and user management. It also uses a PostgreSQL database from Neon to store user information and chat history. We use the Drizzle ORM to interact with the database. Open AI is used for the AI chatbot.

The Vue.js frontend for this application can be found here.

Installation

1. Clone the repository
2. Run npm install
3. Create a .env file in the root directory and add the following environment variables:

PORT=5000
STREAM_API_KEY=""
STREAM_API_SECRET=""
OPENAI_API_KEY=""
DATABASE_URL="postgresql://username:password@localhost:5432/dbname"

You can get these keys by signing up for Stream, Open AI, and Neon.

4. Run database migrations with Drizzle Kit:

npx drizzle-kit generate
npx drizzle-kit migrate

This will create the necessary tables in your database.

5. Run the server with npm run dev and open on http://localhost:5000

Endpoints

• POST /register-user - Create a user in Stream chat and in our own database
• POST /chat - Creates a new Stream chat channel, sends a request to Open AI to generate a response, and saves the chat history in our database
• POST /get-messages - Get's the chat history for a specific user

Building For Production

This is a TypeScript project, so you will need to build the project before running in production. Run npm run build to build the project. You can then run the server with npm start. The files will be in the dist directory.