What is fastapi-dependency-graph?

The fastapi-dependency-graph project is a tool for visualizing how different parts of a FastAPI application connect to each other. FastAPI is a popular Python framework for building web APIs, and it relies heavily on a system of "dependencies", pieces of code that handle things like database connections or user authentication, which can be reused across different API routes. This tool maps those connections out visually, so you can see the structure of your app at a glance rather than digging through code. When an API grows, these dependency chains can get tangled. One API endpoint might require a database session, which in turn requires a user check, which requires a token validation. Reading that flow in code is doable, but seeing it drawn as a graph makes it much easier to spot redundancy, circular dependencies, or overly complex chains. The project generates a visual diagram from the dependency structure, turning abstract code relationships into something you can actually look at. This would be useful for developers working on medium-to-large FastAPI projects where the dependency wiring has gotten hard to follow. A backend engineer trying to refactor an API, or a tech lead reviewing a pull request that touches shared dependencies, could use the graph to verify the impact of a change. It is the kind of tool that becomes more valuable as a codebase ages and the original mental model of how things connect starts to fade. The README does not go into detail on installation, usage, or configuration, so it is unclear how mature or ready for production use the project currently is. It appears to be an early-stage or experimental utility rather than a polished product.