json_stringify_sorted_object_keys.js

JSON.stringify(o, function (k,v) {
    if (v && typeof v === 'object' && !isArray(v)) { // assumes an isArray function
        var sorted = {},
            keys = [],
            key,i,len;

        for (key in v) {
            if (v.hasOwnProperty(key)) {
                keys.push(key);
            }
        }

        keys.sort();

        for (i = 0, len = keys.length; i < len; ++i) {
            sorted[keys[i]] = v[keys[i]];
        }

        return sorted;
    } else {
        return v;
    }
}, 4);