Visualizing SharePoint List Relationships as ER Diagrams

In several SharePoint-based projects, I encountered the same challenge. As solutions grow, list relationships become increasingly difficult to understand.

This is especially true in environments with multiple lookup columns, implicit relational structures, and long-lived tenant environments where schemas evolve over time.

Although SharePoint provides rich metadata, there is no built-in way to visualize list relationships as an ER diagram.

To explore this problem, I built a small browser extension that extracts list and column metadata from a SharePoint site, detects lookup relationships, and generates PlantUML-based ER diagram code. It can also export structured definitions to Excel.

The goal is not only diagram generation, but improving architectural visibility, impact analysis during schema changes, documentation quality in long-term projects, and migration planning such as moving SharePoint lists to Dataverse.

I am particularly interested in how other developers document SharePoint list structures in larger environments.

The extension itself is available here:
https://chromewebstore.google.com/detail/sharepoint-erd-generator/nbjfcilmndpofckndmcadgfcacadgeak

I would appreciate any feedback or discussion around approaches to SharePoint schema documentation.