MermaidGPT

A simple Streamlit app that turns text prompts into Mermaid.js diagrams using OpenAI, Anthropic, or Gemini.

Setup

git clone https://github.com/jgordley/MermaidGPT
cd MermaidGPT
pip install -r requirements.txt

Usage

streamlit run main.py

1. Enter your OpenAI API key in the sidebar
2. Select a chart type and orientation
3. Describe what you want to diagram
4. Click Generate

How it works

• Your prompt is sent to OpenAI (gpt-4o) with instructions to return Mermaid.js markdown
• The markdown is encoded and sent to mermaid.ink to render an image
• The image is displayed in the app alongside the raw markdown

Files

main.py              # Streamlit app entry point
prompt.py            # OpenAI API call
mermaid.py           # Diagram rendering via mermaid.ink
components/
  sidebar.py         # API key input and app info