Live App: https://hypermodule.github.io/usmap2json/
Simple web app that can parse a .usmap file and display its content in JSON format.
The parsing logic is a port of the parsing logic found in CUE4Parse:
https://github.com/FabianFG/CUE4Parse/blob/master/CUE4Parse/MappingsProvider/Usmap/UsmapParser.cs