use sly to parse json :

1. https://tools.ietf.org/html/rfc7159
2. https://github.com/dabeaz/sly
3. https://github.com/counsellors/jsonparser

simple support

1. {"1": "1", "2":"1"}
2. ["1", "2"]
3. ["1", {"1": "2"}]
4. {"1": "1", "2": ["1"]}

todo

finish all