JSFiddle - React, Tailwind, and code Playground

JavaScript

var jo = {
    "name": "John Smith",
    "age": 32,
    "employed": true,
    "address": {
        "street": "701 First Ave.",
        "city": "Sunnyvale, CA 95125",
        "country": "United States"
    },
    "children": [
        {
            "name": "Richard",
            "age": 7
        },
        {
            "name": "Susan",
            "age": 4
        },
        {
            "name": "James",
            "age": 3
        }
    ]
};
jo["collegeId"] = {};
jo["collegeId"]["eventno"] = "6062";
jo["collegeId"]["eventdesc"] = "abc";
alert(jo.collegeId.eventdesc);