fastapi-di-viz

FastAPI Dependency Injection Visualizer

This is a simple tool to visualize the dependency injection tree of a FastAPI application. It works by inspecting the FastAPI application and generating a graph of the dependencies from walking the dependency injection tree starting from the application's endpoints.

It automatically detects the endpoints and the dependencies of the application and generates a graph of the dependencies.

Usage

Install the package in the environment where your FastAPI application is installed.

pip install fastapi-di-viz

Then run the following command to generate the graph:

fastapi-di-viz your_app.main:app

A sample graph for the application in fastapi_di_viz/sample looks like this:

---
title: FastAPI dependency chain
---
graph TD;
    root --> get_settings
    a --> get_serviceA
    get_serviceA --> get_repo
    get_serviceA --> get_settings
    b --> get_serviceB
    get_serviceB --> get_repo

The tool supports graphs in the following formats:

• Graphviz DOT format
• Mermaid flowchart format