FastAPI API + LangGraph PoC for learning

Proof-of-concept RAG and agent orchestration using FastAPI, LangGraph, and OpenRouter.

Setup Instructions

1. Install Python

Ensure you have Python 3.11+ installed.

2. Install uv using Homebrew

uv is used for fast dependency and workspace management:

brew install uv

3. Install Dependencies

Initialize the virtual environment and sync dependencies:

uv sync

4. Configure Environment

Create a .env file in the root directory and specify your OPENROUTER_API_KEY:

OPENROUTER_API_KEY="your-openrouter-api-key-here"

5. Start the Server

Start the development server with:

fastapi dev

Alternatively, you can run:

uv run fastapi dev

Testing the API

Once the server is running, you can test the /chat endpoint using the following curl command:

curl -X POST localhost:8000/chat \
  -H "Content-Type: application/json" \
  -d '{"message":"When was Steve Jobs born?"}'