your sample doesn't validate, even before the quotes have been examined

Furthermore, shouldn't the JSON serializer working on the original source/structure be producing valid JSON anyway?

Error:Expecting string or }, not [.Code 4, Structure 2
Error:Strings should be wrapped in double quotes.Code 17, Structure 4
Error:Strings should be wrapped in double quotes.Code 17, Structure 6
Error:Strings should be wrapped in double quotes.Code 17, Structure 8
Error:Strings should be wrapped in double quotes.Code 17, Structure 10
Error:Strings should be wrapped in double quotes.Code 17, Structure 12
Error:Strings should be wrapped in double quotes.Code 17, Structure 14
Error:Invalid characters found.Code 18, Structure 14
Error:Strings should be wrapped in double quotes.Code 17, Structure 18
Error:Strings should be wrapped in double quotes.Code 17, Structure 20
Error:Strings should be wrapped in double quotes.Code 17, Structure 22
Error:Strings should be wrapped in double quotes.Code 17, Structure 24
Error:Strings should be wrapped in double quotes.Code 17, Structure 26
Error:Strings should be wrapped in double quotes.Code 17, Structure 28
Error:Expecting comma, colon or }, not string.Code 11, Structure 29
Error:Strings should be wrapped in double quotes.Code 17, Structure 29
Error:Expecting comma, colon or }, not string.Code 11, Structure 30
Error:Strings should be wrapped in double quotes.Code 17, Structure 30
Error:Invalid characters found.Code 18, Structure 30
Error:Strings should be wrapped in double quotes.Code 17, Structure 34
Error:Strings should be wrapped in double quotes.Code 17, Structure 36
Error:Strings should be wrapped in double quotes.Code 17, Structure 38
Error:Strings should be wrapped in double quotes.Code 17, Structure 40
Error:Expecting comma, colon or }, not string.Code 11, Structure 41
Error:Strings should be wrapped in double quotes.Code 17, Structure 41
Error:Strings should be wrapped in double quotes.Code 17, Structure 43
Error:Strings should be wrapped in double quotes.Code 17, Structure 45
Error:Expecting comma, colon or }, not ].Code 11, Structure 46
Error:Expecting comma or ], not }.Code 6, Structure 47
Error:Expecting closing } at endCode 22, Structure 47