Session fails in cookie parser?

Question

Node.js

Hello, in order to authorize users when working through tips, I try to check the session through the cookie parser module , namely the cookieParser.signedCookie(str, secret) method

io.use(function(socket, next) {

  var handshakeData = socket.request;
  handshakeData.cookies = cookie.parse(handshakeData.headers.cookie || '');
  var sidCookie = handshakeData.cookies[config.session.name];

  var sid = cookieParser.signedCookie(sidCookie, config.session.secret);
  console.log(sid)

});

As a result, sid is always equal to sidCookie that was sent to cookieParser.signedCookie for validation, even if I slipped the wrong secret. What can be wrong?