Exit after res.send() in Express.js

Of course express can not magically make your javascript function stop executing from somewhere else.

I don’t like the next([error]) solution because I think errors should be only used for circumstances you usually don’t expect (like an unreachable database or something). In this case, a simple wrong password would cause an error. It is a common convention to not use exceptions/errors for ordinary control flow.

I therefore recommend to place a return statement after the res.send call to make your function stop executing further.

client.login( username, password, function( auth, client ) {
  if( !auth ) {
    res.send( 401 );
    return;
  }

  // DO OTHER STUFF REALLY ONLY IF AUTH IS SUCCESSFUL
}