Ask HN: Favorite (Web) Developer Tool?

Curious to know more about what tools others use for web development.

In particular I've found that I've been spending a good deal of time manually mocking out data in my local environment for work. The process of reverse engineering which database models/tables need to be populated with specific records in order to render the frontend (React) components that I want has been tedious.

Does anybody know of a "full stack" web dev tool that could help with the visualization of this reverse engineering process?