JSFiddle - React, Tailwind, and code Playground

JavaScript

let doc = {
  "arr": [
    { "a": 1, "b": 2 },
    { "c": 3, "d": 4 }
  ]
};
var str = JSON.stringify(doc, null, 2);

var pre = document.createElement("pre");
pre.innerHTML = str;
document.body.appendChild(pre);