yapi2str is a free Chrome add-on developed by victor820. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This program allows users to format and organize data stored in YAPI, a website that provides a platform for managing and documenting APIs.

With yapi2str, users can easily convert hierarchical interface data into a string format, either in JSDoc or mock format. This is particularly useful when working with YAPI's interface data, which is presented as DOM elements with nested interfaces. By converting the data into a flattened string format, it becomes easier to access and generate the desired strings or mock data. This add-on eliminates the need for repetitive copy-pasting operations, making data organization and formatting more efficient.