> in C++ I worked with property_trees from BOOST (under the BOOST license):
>
> https://www.boost.org/doc/libs/1_73_0/doc/html/property_tree.html

Two more remarks:

1. LilyPond already seems to use some parts of the BOOST library (which
is kind of the extended C++ STL). There should be no license issues.

2. Despite the fact that there is no "json" in its name it works with
json files very easily:


        boost::property_tree::ptree pt;
        boost::property_tree::read_json(ss, pt);

Cheers,
Joram

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