JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = {
    "data": {
        "location": {
            "type": "List",
                "count": 1,
                "items": [{
                "id": 1,
                    "type": "S",
                    "address": {
                    "street": "123 Main St",
                        "city": "New York",
                        "state": "NY"
                }
            }, {
                "id": 2,
                    "type": "S",
                    "address": {
                    "street": "1323 South St",
                        "city": "New York",
                        "state": "NY"
                }
            }]
        }
    }
}

//https://gist.github.com/megawac/6162481#file-underscore-lookup-js
var lookup = function (obj, key) {
    var type = typeof key;
    if (type == 'string' || type == "number") key = ("" + key).replace(/\[(.*?)\]/, function (m, key) { //handle case where [1] may occur
        return '.' + key;
    }).split('.');
    for (var i = 0, l = key.length, currentkey; i < l; i++) {
        if (obj.hasOwnProperty(key[i])) obj = obj[key[i]];
        else return undefined;
    }
    return obj;
}

//syntax: lookup(jsonobj, input);
//Tests using your data
console.log(lookup(data, "data.location.type")) //=> "List"
console.log(lookup(data, "data.location.items[1].address.street")) //=> ""1323 South St"