Js Asyncronious Programming - Weather

(() => {

    const BASE_URL = "https://judgetests.firebaseio.com/locations.json";
    let TODAY_URL = "https://judgetests.firebaseio.com/forecast/today/{code}.json";

    const elements = {
        locationInput: document.querySelector("#location"),
        button: document.querySelector("#submit"),
        notificationHeading: document.querySelector('h1.notification')
    };

    const errorHandler = (e) => {
        console.dir(e);
        elements.notificationHeading.textContent = e.message;
    };

    const jsonMiddleware = (r) => r.json();

    elements.button.addEventListener("click", getLocationValue);

    function getLocationValue() {

        const location = elements.locationInput.value;

        fetch(BASE_URL)
            .then(jsonMiddleware)
            .then((data) => {
                const { name, code } = data.find((o) => o.name === location);

                TODAY_URL = TODAY_URL.replace('{code}', code);

                fetch(TODAY_URL)
                    .then(jsonMiddleware)
                    .then((data) => {
                        console.log(data);
                    })
                    .catch(errorHandler)
            })
            .catch(errorHandler)
    }
})();