Script to restore uglified url. See https://developers.google.com/webmasters/ajax-crawling/docs/specification .

prerrifyUrl.js

var url = require('url');
var querystring = require('querystring');

prettifyUrl = function (uglyUrl) {
    var oldUrlObj = url.parse(uglyUrl);
    var queryObj = querystring.parse(oldUrlObj.query);

    if ('_escaped_fragment_' in queryObj) {
        var escapedFragment = queryObj._escaped_fragment_;
        delete queryObj['_escaped_fragment_'];
    } else {
        // url is not UGLYYYY
        return uglyUrl;
    }

    var newUrlObj = {
        protocol: oldUrlObj.protocol,
        slash: oldUrlObj.slash,
        host: oldUrlObj.host,
        port: oldUrlObj.port,
        hostname: oldUrlObj.hostname,
        hash: '#!' + escapedFragment,
        query: queryObj,
        pathname: oldUrlObj.pathname
    }

    return url.format(newUrlObj)
}

var u1_org = 'http://example.com/?query=123#!key1=value1&key2=value2';
var u1_ugl = 'http://example.com/?_escaped_fragment_=key1=value1%26key2=value2&query=123';

var u2_org = 'http://example.com/?query=123';
var u2_ugl = 'http://example.com/?_escaped_fragment_=&query=123';

console.log('[original]  ', u1_org);
console.log('[uglified]  ', u1_ugl);
console.log('[prettified]', prettifyUrl(u1_ugl));
console.log('');
console.log('[original]  ', u2_org);
console.log('[uglified]  ', u2_ugl);
console.log('[prettified]', prettifyUrl(u2_ugl));