JSFiddle - React, Tailwind, and code Playground

JavaScript

var json_data='[{"row":[{"lg":"col-lg-9","md":"col-md-9", "sm":"col-sm-8", "xs":"col-xs-10", "content":"Nav", "lg_offset":1 }, {"lg":"col-lg-3", "md":"col-md-3", "sm":"col-sm-4", "xs":"col-xs-8", "content":"Logo33223"} ] }, {"row":[{"lg":"col-lg-4", "md":"col-md-4", "sm":"col-sm-6", "xs":"col-xs-12", "content":"Block1"}, {"lg":"col-lg-4", "md":"col-md-4", "sm":"col-sm-6", "xs":"col-xs-12", "content":"Block2"}, {"lg":"col-lg-4", "md":"col-md-4", "sm":"col-sm-6", "xs":"col-xs-12", "content":"<h1>Привет мир!</h1>"} ] }, {"row":[{"lg":"col-lg-3", "md":"col-md-3", "sm":"col-sm-3", "xs":"col-xs-3"} ]}]'; 
json_data = JSON.parse(json_data);
alert(json_data[1].row[2].content);