JSFiddle - React, Tailwind, and code Playground

HTML

<pre id="output"></pre>

<pre id="new_output"></pre>

JavaScript

const data = [{
  "q1":"5",
  "q2":[
     "13",
     "12",
  ],
  "q3":"test",
}];

document.getElementById('output').innerHTML = JSON.stringify(data, null, 4);



var modified = data.map(function(item) {
  return Object.keys(item)
})

document.getElementById('new_output').innerHTML = JSON.stringify(modified, null, 4);