As long as we are on topic of JSON alternatives suitable for configuration, I've been tinkering with various minimal syntaxes and formats for a long time, most notably Jevko[0].

One format based on that I've been conjuring up recently would represent the first example from the RON README like so:

    GameConfig[ optional struct name
        window size [[800] [600]]
        window title [PAC-MAN]
        fullscreen [false]

        mouse sensitivity [1.4]
        key bindings [
            up [Up]
            down [Down]
            left [Left]
            right [Right]
            
            Uncomment to enable WASD controls
            ;[
            W [Up]
            A [Down]
            S [Left]
            D [Right]
            ]
        ]
        
        difficulty options [
            start difficulty [Easy]
            adaptive [false]
        ]
    ]

I put a syntax-highlighted version and some more details in this gist[1].

I wonder what you guys think about such a minimal alternative.

[0] https://jevko.org

[1] https://gist.github.com/djedr/4eeac1de466512ec211ff17cfd1f5e...