The D3 Deconstructor is a Google Chrome extension developed by UC Berkeley VisLab. It is designed to extract data from D3.js visualizations on a web page. D3.js binds data to DOM elements when creating a visualization, and this extension allows users to extract this data along with the visual mark attributes of each element.

Developed in the VisLab at UC Berkeley, the D3 Deconstructor also enables restyling of D3 visualizations based on the extracted data. With this extension, users can gain insights into the underlying data and attributes of D3 visualizations, empowering them to analyze and manipulate the visualizations in new ways.