JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [{
  "country": "Andorra",
  "code": "AD",
  "state": [{
    "state_code": "AD1",
    "state_description": "aaAndorra1"
  }, {
    "state_code": "AD2",
    "state_description": "aaAndorra2"
  }]
}]

data.forEach(function(itm) {
  itm.state.forEach(function(itm1) {
    console.log(itm1.state_code, itm1.state_description);
  });
});