Gets query string and returns as an object of key-value pairs

getQueryString.js

/**
 * Gets query string and returns as an object of key-value pairs
 * @returns {Object or null}
 */
function getQueryString() {
    let q = document.location.href.split('?')[1];
    let o = {};

    if (q && q.length) {

        q = q.split('&');

        q.forEach(element => {
            if (element.indexOf('=') > -1) { // If the query string parameter has a value
                let key_value = element.split('=');
                o[key_value[0]] = key_value[1];
            } else {``
                o[element] = undefined;
            }
        });

        if (Object.keys(o).length)
            return o;
    }

    return null;
}