How to redirect to a different URL after successful Okta authentication?

Questions OAuth/OIDC
1

I am trying to integrate Okta authentication to my app.
The flow is I make a call from http://localhost:8000 to http://localhost:5000 where is my node-express app doing the authentication. I was able to successfully authenticate the user. However, after authentication it redirects to http://localhost:5000 instead of http://localhost:8000.

I used this post Sign users in to your web app using the redirect model | Okta Developer to integrate Okta.

I can certainly hardcode the res.redirect('/') to redirect me to the http://localhost:8000. However, is there any other way I can achieve the same?

export default class OktaHandler {
    private app: SSOApplication | undefined;
    public register(app: SSOApplication) {
        if (this.app) {
            Log.warn("Duplicate App registration (ignoring)");
            return;
        }
        // const baseURL = this.app.getBaseURL();
        this.app = app;
        app.expInstance.use(session({
            secret: 'CanYouLookTheOtherWay',
            resave: false,
            saveUninitialized: true,
        }));

        app.expInstance.use(passport.initialize());
        app.expInstance.use(passport.session());

        // set up passport
        passport.use('oidc', new Strategy({
            issuer: `https://${yourOktaDomain}/oauth2/default`,
            authorizationURL: `https://${yourOktaDomain}/oauth2/default/v1/authorize`,
            tokenURL: `https://${yourOktaDomain}/oauth2/default/v1/token`,
            userInfoURL: `https://${yourOktaDomain}/oauth2/default/v1/userinfo`,
            clientID: `${yourClientID}`,
            clientSecret: `${yourClientSecret}`,
            callbackURL: `/authorization-code/callback`,
            scope: `openid profile`
        }, (issuer, profile, done) => {
            return done(null, profile);
        }));

        passport.serializeUser((user, next) => {
            next(null, user);
        });
        passport.deserializeUser((obj: any, next) => {
            next(null, obj);
        });

        app.expInstance.get('/oktaLogin', passport.authenticate('oidc'));

        app.expInstance.get('/authorization-code/callback',
            passport.authenticate('oidc', { failureRedirect: '/error' }),
            async (req: any, res: any) => {
                try {
                    const email = (req.user as any).username ?? "";
                    const scopes = await ScopeService.GetScopesForUser(email);
                    const token = TokenManager.createSignedJWTToken({
                        email,
                        google: req.user,
                        scopes
                    }, email);
    
                    const url = req.query["state"] && req.query["state"] + "";
                    const redir = url || "/";
                    res.cookie(SSOApplication.COOKIE_NAME, token, {
                        httpOnly: true,
                        secure: true,
                        sameSite: "none"
                    });
                    Log.audit({
                        action: "Log in",
                        target: undefined,
                        user: email
                    });
                    res.redirect("/");
                } catch (error) {
                    
                }
            }
        );
    }
}```