JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = {
    "RESPONSE": {
        "@xmlns": "",
            "CODE": "0",
            "SECODE": "0",
            "TXNID": "17527",
            "LASTBALANCE": "-12078.8",
            "SURCHARGE": "2",
            "CUSTOMERDETAILS": {
            "NAME": "Mr.ABC"
        }
    }
};
$("body").append("<div>LASTBALANCE : " + find_value("LASTBALANCE") + "</div>");
$("body").append("<div>NAME : " + find_value("CUSTOMERDETAILS", "NAME") + "</div>");

function find_value(key, inner_key) {
    var value = "";
    $.each(data.RESPONSE, function (i, k) {
        console.log(i, key, i == key)
        if (i == key) {
            value = k;
            return false;
        }
    });
    if (inner_key) {
        if (value[inner_key]) {
            value = value[inner_key];
        }
    }
    return value;
}