em chào mọi người làm sao để format chuỗi string thành chuỗi json vậy ạ
em sài json note đọc dữ liệu xuất ra:
nationality": {"code": "","description": ""}
dữ liệu mong muốn
nationality": { "code": "", "description": "" }
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Em có thể dùng Jackson ObjectMapper với writerWithDefaultPrettyPrinter em nhé.