JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>
        <input type="checkbox" />My checkbox
    </li>
</ul>

JavaScript

var data = {
    "section": {
        "1": {
            "question": [{
                "id": "1a",
                "num": "1",
                "title": "test"
            }, {
                "id": "1b",
                "num": "2",
                "title": "test"
            }]
        },
        "2": {
            "question": [{
                "id": "2a",
                "num": "1",
                "title": "test"
            }, {
                "id": "2b",
                "num": "2",
                "title": "test"
            }]
        }
    }
}
    var num = 0;
    for (key in data.section) {
       num++
    }
           
    console.log(num)