Deserialize query string to JSON object

Question

Tried to find how to make {foo:\"bar\"} from ?...&foo=bar&... but googled and got only to jQuery.params which does the opposit

Answer 1

Actually the above answer by @talsibony doesn't take into account query string arrays (such as test=1&test=2&test=3&check=wow&such=doge). This is my implementation:

function queryStringToJSON(qs) {
    qs = qs || location.search.slice(1);

    var pairs = qs.split('&');
    var result = {};
    pairs.forEach(function(p) {
        var pair = p.split('=');
        var key = pair[0];
        var value = decodeURIComponent(pair[1] || '');

        if( result[key] ) {
            if( Object.prototype.toString.call( result[key] ) === '[object Array]' ) {
                result[key].push( value );
            } else {
                result[key] = [ result[key], value ];
            }
        } else {
            result[key] = value;
        }
    });

    return JSON.parse(JSON.stringify(result));
};