NodeJs Decrypt laravel5.6 Session Id from the cookie

So as the title dictate, i'm trying to decrypt the session id of a laravel app usgin nodeJs. but i keep getting this error when i try to unserialize the data:

SyntaxError: Unknown / Unhandled data type(s): at error (C:\V12Projects\craiglist\node_modules\php-unserialize\php-unserialize.js:54:13)

My main code is the following:

let session = cookie.parse(req.headers.cookie).laravel_session;
let sessionKey = getSessionKey(session, process.env.APP_KEY);

My helper function 'getSessionKey' is as follow:

getSessionKey = function(laravelSession, laravelKey, keyLength) {
       keyLength = keyLength || 32;
       let cypher = 'aes-' + keyLength * 8 + '-cbc'; // + '-cbc'

       //Get session object
       laravelSession = new Buffer(laravelSession, 'base64');
       laravelSession = laravelSession.toString();
       laravelSession = JSON.parse(laravelSession);

       //Create key buffer
       laravelKey = new Buffer(laravelKey, 'base64');

       //crypto required iv in binary or buffer
       laravelSession.iv = new Buffer(laravelSession.iv, 'base64');
       laravelSession.value = new Buffer(laravelSession.value, 'base64')

       //create decoder
       let decipher = crypto.createDecipheriv(cypher, laravelKey, laravelSession.iv);

       decipher.setAutoPadding(false);
       //let decoded = decoder.update(laravelSession.value, 'base64');
       let decoded = Buffer.concat([decipher.update(laravelSession.value), decipher.final()], 'base64');

       //the error happens in the line below
       let sessionId = PHPUnserialize.unserialize(decoded.toString('ascii'));

       return sessionId;
}

via Chebli Mohamed