JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [
          {"mes":{
                  "January":{
                     "Inversion":"1000","Fans":"1020"}
                            }
                 },
           {"mes":{
                 "February":{
                     "Inversion":"15500","Fans":"285"}
                            }
            }
            ];
for (var i = 0; i < data.length; i += 1) {
  obj = data[i].mes;
  for (key in obj) {
    if(obj.hasOwnProperty(key)) {
      var monthName = key;
    }
  }
    console.log(obj, obj[monthName]);
  var iv = obj[monthName].Inversion;
    var fans = obj[monthName].Fans;
  console.log( monthName + "," + iv + "," + fans);
}