Question

how can I do this in express?

req.session.oa = new OAuth(....);

// and in another request
req.session.oa.getOAuthToken(...);

the session is store in redis.

Answer 1

I would store the oauth_token and oauth_token_secret in the session and have the OAuth object be in app.settings.

So you would have

app.configure('development', function() {
  // ...
  app.set('OACLIENT', new OAuth(...));
  // ...
});

And then in the routes

var params = {
   token: req.session.oa.access_token,
   token_secret: req.session.oa.access_token_secret
};
req.app.settings.OACLIENT.function(params /* Or whatever */)