Parsing JSON string with nested JSON strings

gistfile1.js

const json = "[{'id': 702, 'data': '{"color":"red","age":"32"}'}, {'id': 850, 'data': '{"color":"blue","age":"25"}'}, {'id': 941, 'data': '{"color":"yellow","age":"12"}'}]"; //cannot change the json. This comes from another system

const arr = JSON.parse(json); //error here

const expected = [{'id': 702, 'data': '{"color":"red","age":"32"}'}, {'id': 850, 'data': '{"color":"blue","age":"25"}'}, {'id': 941, 'data': '{"color":"yellow","age":"12"}'}];

console.log(arr);

const success = expected === arr;
//should be true, but getting error