JSFiddle - React, Tailwind, and code Playground

JavaScript

var addressList = {"Addresses":[{"address":"1111 W Main"},{"address":"2222 W Main"},{"address":"1111 W Main"},{"address":"3333  Main"}]}; 

var arr = new Array();
for(var i =0; i < addressList.Addresses.length; i++){
 arr.push(addressList.Addresses[i].address);
}

      var sortedAddressList = arr.sort();

           var results = [];

                for (var i = 0; i < sortedAddressList.length; i++) {

                if (sortedAddressList[i + 1] != sortedAddressList[i]) {

                    results.push(sortedAddressList[i]);
                    }
                }


        alert(results);