gistfile1.txt

tonyo@imac ~/projects/zef$ perl6 -Ilib -MZef::Utils::JSON -e 'say to-json([{a => { b => "c", c => { d => 5.5, e => 4 } } }, a => 6], :human-readable(True));'
[
    {
        "a": {
            "c": {
                "e": 4,
                "d": 5.5
            },
            "b": "c"
        }
    },
    {
        "a": 6
    }
]