Node js + express как установить куки через функцию?

function authclients(data){
	if(!data['name']) return;
	if(!data['pass']) return;
	sqlc.getConnection(function(error, connection) {
		sqlc.query("SELECT * FROM users WHERE name = ?", [data['name']], function(err, rows, fields){
			if(!rows) return;
			if(rows[0]['pass'] == data['pass']){
					const secret = 'abcdefg';
					const hash = crypto.createHmac('sha256', secret)
                   .update('1234a')
                   .digest('hex');
					cookiesid = Math.random();
					sqlc.query('UPDATE users SET cookie = ?,hash = ? WHERE id = ?', [cookiesid,hash,rows[0]['id']]);
					console.log('Авторизован'); 
			}else return;
		});
	}); 
}

app.post('/post', upload.array(), function (req, res, next) {
    switch(req.body['type']){ 
		case 'auth':
			authclients(req.body['data']);
			break;
	}
});

app.post('/post', upload.array(), function (req, res, next) {
    switch(req.body['type']){ 
    case 'auth':
      authclients(req.body['data'] , res );
      break;
  }
});

function authclients(data, res){
  if(!data['name']) return;
  if(!data['pass']) return;
  sqlc.getConnection(function(error, connection) {
    sqlc.query("SELECT * FROM users WHERE name = ?", [data['name']], function(err, rows, fields){
      if(!rows) return;
      if(rows[0]['pass'] == data['pass']){
          const secret = 'abcdefg';
          const hash = crypto.createHmac('sha256', secret)
                   .update('1234a')
                   .digest('hex');
          cookiesid = Math.random();
          sqlc.query('UPDATE users SET cookie = ?,hash = ? WHERE id = ?', [cookiesid,hash,rows[0]['id']]);
          res.cookie('userid', '', { expires: new Date(Date.now() + 900000), httpOnly: true });
          console.log('Авторизован'); 
      }
    });
  }); 
}

writeHead: [Function: writeHead],
  [Symbol(outHeadersKey)]:
   { 'set-cookie':
      [ 'Set-Cookie',
        'userid=0.4073350528603512; Path=/; Expires=Wed, 18 Oct 2017 15:24:25 GMT; HttpOnly' ] } }

app.use('/',function(req, res, next){
res.cookie('userid', '', { expires: new Date(Date.now() + 900000), httpOnly: true });
});

function authclients(data, res){
  if(!data['name']) return;
  if(!data['pass']) return;
  sqlc.getConnection(function(error, connection) {
    sqlc.query("SELECT * FROM users WHERE name = ?", [data['name']], function(err, rows, fields){
      if(!rows) return;
      if(rows[0]['pass'] == data['pass']){
          const secret = 'abcdefg';
          const hash = crypto.createHmac('sha256', secret)
                   .update('1234a')
                   .digest('hex');
          cookiesid = Math.random();
          sqlc.query('UPDATE users SET cookie = ?,hash = ? WHERE id = ?', [cookiesid,hash,rows[0]['id']]);
          res.cookie('userid', '', { expires: new Date(Date.now() + 900000), httpOnly: true });
          console.log('Авторизован');
          res.send();
      }
    });
  }); 
}

app.post('/post', upload.array(), function (req, res, next) {
    switch(req.body['type']){ 
    case 'auth':
      authclients(req.body['data'] , res );
      break;
  }
});