JSFiddle - React, Tailwind, and code Playground

JavaScript

// Convert Nested Json to Flat Json
// Check the final json in firebug console.
var fullData = {
  "message": {
    "welcome": "Welcome, select your language.",
    "destination": {
      "title": "Select a destination."
    }
  }
};

var finalData = [];
loopJson(fullData.data);
function loopJson(data) {
    $.each(data, function(i, e) {
        if (e.Children.length>0) {
            var ccd = e.Children;
            delete e.Children;
            finalData.push(e);
            loopJson(ccd);
        } else {
            delete e.Children;
            finalData.push(e);
        }
    });
}
console.log(finalData);