Both XML and JSON are just specially formatted text files with different syntax. It looks users want's to frequently convert one to each other and thus some programs, like the oXygen XML Editor provide this functionality to its product. There is a dedicated XML to JSON conversion function in oXygen that might help you. You can also find several web pages that offer XML of JSON conversion of some sorts.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert xml to json on Windows
Navicat Premium is database administration tool for Microsoft Windows. It is able to connect and manage MySQL, Oracle and PostgreSQL databases.
Convert from xml file
to json file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.