How to create a json file body to post an API request

Hi team ,

Please help me in creating the below JSON body to process a post request in API -

{
“ShortName”: “02”,
“IssueAge”: 40,
“Gender”: “M”,
“Class”: “Smoker”,
“Rating”: {
“RatingClass”: “C”,
“RiskClass1”: “None”,
“RiskClass2”: “None”,
“aviation”: “None”,
“Extra”: {
“Amount1”: 10,
“Duration1”: 5,
“Amount2”: 8,
“Duration2”: 12
}

 },
"Jurisdiction": "NJ",

}

Please provide inputs on the same.

Regards,
Gokul

Check this solution Making web API call, Method not found - #7 by marian.platonov