I need to generate certain format of data according to some rules, the sample data is as showed below

 "biz_content": "{"create_ip":"127.0.0.1","create_time":"20231114110200","expire_time":"20231124110200"

so i thought it would be ok to parse the json data directly into string by using

   biz_content: 
   {
    "create_ip":"127.0.0.1",
    "create_time":"20240523093226",
    "expire_time":"20240523095226",
    ...
   }
   JSON.stringify( json )

but the resulted string is like

"biz_content": '{"create_ip":"127.0.0.1","create_time":"20240523093226","expire_time":"20240523095226",...}'

how would I parse it to the format like

  "{"create_ip":"127.0.0.1","create_time"