JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = {
    "menu": {
        "id": 90,
            "params": {
            "categories": ["190"],
                "singleCatOrdering": "",
                "menu-anchor_title": ""
        }
    }
};

var keys = Object.keys(data);
var columns;
for (var ii = 0, key; key = keys[ii]; ii++) {
    value = data[key];
    if (value.id < 100) {
        value.params.categories[0] += "0";
        alert(value.params.categories[0]);
    }
}