Passport req.user is undefined when using GitHub strategy - node.js

Question

I'm trying to set up Github authentication using passport.
app.js (where i set up middleware)
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const session = require('express-session');
const passport = require('passport');
const GitHubStrategy = require('passport-github').Strategy;
var indexRouter = require('./routes/index');
var app = express();
const helmet = require('helmet');
app.use(helmet());
const passportConfig = require('./config');
//================================PASSPORT CONFIG=======================
app.use(session({
secret: 'test1234',
resave: false,
saveUninitialized: true,
cookie: { secure: true }
}));
app.use(passport.initialize());
app.use(passport.session());
passport.use(new GitHubStrategy(passportConfig,
function (accessToken, refreshToken, profile, cb) {
return cb(null, profile)
}
));
passport.serializeUser(function(user, done) {
done(null, user.id);
});
passport.deserializeUser(function(id, done) {
done(null, user);
});
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({extended: false}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
// catch 404 and forward to error handler
app.use(function (req, res, next) {
next(createError(404));
});
// error handler
app.use(function (err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
As you can see, I set up express session and use passport.initialize() and passport.session()
But when i try retrieving the req.user object in any of my routes, it returns undefined. Does anyone know what the reason for this might be?

Answer 1

I think this is an issue of app.use(passport.session()); middleware, Manually saving the session before doing any action.
app.get('slack/callback', function(req,res){
passport.authorize('slack');
//Manually save session before redirect.
req.session.save(function(){
res.redirect('/someURL');
});
})