Tedious: Failed to connect to local sqlexpress - but can connect in management studio

I had this happen a while ago but enabling tcp/ip seemed to fix it but now I cannot connect again and I cant figure out why. Tcp seems to be enabled in configuration manager. Please am I doing something wrong?

As a feature request it would be good to have better feedback if we are doing this wrong or if possible to make tedious use the same logic to connect as sql-server management studio.

This is with sql-server express 2008r2, [email protected]

var Connection = require('tedious').Connection;
var config = {
  userName: 'myuser',
  password: 'password',
  server: 'localhost',
  options: {
      database: 'testdb',
      instanceName: 'sqlexpress'
  }
}
var connection = new Connection(config);
connection.on('connect', function(err) {
  if (err) {
    console.log(err);
  } else {
    console.log('Connected');
  }
});

{ ConnectionError: Failed to connect to localhost:undefined in 15000ms
    at ConnectionError (C:\work\sqltest\node_modules\tedious\lib\errors.js:12:12)
    at Connection.connectTimeout (C:\work\sqltest\node_modules\tedious\lib\connection.js:789:28)
    at ontimeout (timers.js:475:11)
    at tryOnTimeout (timers.js:310:5)
    at Timer.listOnTimeout (timers.js:270:5)
  message: 'Failed to connect to localhost:undefined in 15000ms',
  code: 'ETIMEOUT' }

^ this works fine