What libraries do you use to create a configurator for c++ programs?

Question

C++ / C#

Good day!
The project uses some parameters that would be convenient to change from the config, because they are unchanged at runtime, and I would not want to recompile anything when changing any parameter.
Previously, I wrote my bike config, with the help of which I added parameters to the file and read them during initialization.
Now, in another project, there was a need for a similar tool, which made me think, maybe there are similar tools in boost or in stl already, so that every time I don’t write the config processing in a new way, while already obviously debugged and tested?

Answer 1

https://github.com/nlohmann/json

Answer 2

In Qt, this is QSettings. It can encapsulate work with settings stores depending on the OS (Windows - registry, Linux - local ini files in my opinion). You can hardcode the use of an ini file.