Hono + Bun + OpenAI Chat Example

A real-time AI chat example that leverages Server-Sent Events (SSE) to stream responses from OpenAI's API. Built with Hono framework and powered by Bun runtime.

Features

• 🚀 Real-time streaming responses using Server-Sent Events (SSE)
• ⚡️ High-performance backend powered by Bun runtime
• 🔄 Seamless integration with OpenAI API
• 🛠️ Built with Hono - a lightweight, ultrafast web framework
• 📱 Modern and responsive chat interface

Screenshots

Prerequisites

Before you begin, ensure you have the following installed:

• Bun (latest version)
• An OpenAI API key

Usage

bun install

Create a .env file in the project root and add your OpenAI API key:

OPENAI_BASE_URL=openai_base_url
OPENAI_API_KEY=your_api_key_here

bun run dev

Open your browser and navigate to http://localhost:3000

Project Structure

project-root/
├── src/
│   └── index.ts        # Entry point
├── index.html          # Website template
└── package.json

API Endpoints

POST /chat

Initiates a chat session with the AI model.

Request

{
  "prompt": "Your prompt here"
}

Response

Server-Sent Events stream with AI responses.

Acknowledgments

• Hono - The ultrafast web framework
• Bun - The fast all-in-one JavaScript runtime
• OpenAI - For providing the AI capabilities