JSFiddle - React, Tailwind, and code Playground
JavaScript
var str = "{ \"1\": [{\"field\": \"attr\"}]}";
var obj = JSON.parse(str);
alert(obj["1"][0].field);
var str = "{ \"1\": [{\"field\": \"attr\"}]}";
var obj = JSON.parse(str);
alert(obj["1"][0].field);