params-to-object.js

/**
 * Convert URL parameters to an object.
 *
 * @param  {String} url
 * @return {Object}
 */
function getUrlParams( url ) {

    // Use the passed in string or the current URL.
    url = url || document.location.href;

    // Get starting index of the parameters.
    var start = url.indexOf( '?' );

    // Bail if there are no parameters.
    if ( start === -1 ) {
        return {};
    }

    // Remove everything before the parameters start.
    var params = url.slice( start + 1 );

    // Turns params into an array.
    params = params.split( '&' );

    // Enter the array.
    return _.chain( params )
        .map( function ( param ) {
            // Split each string into an array.
            return decodeURIComponent( param ).split( '=' );
        } )
        // Remove empty values.
        .compact()
        // Turn params array into an object.
        .object()
        // Return the object.
        .value();

}