Trouble with OAuth 2.0 Authorization Code Flow in a Node.js App Using Passport.js and MongoDB
Can someone help me understand I'm working on a project and hit a roadblock....... I'm implementing OAuth 2.0 Authorization Code Flow in my Node.js application using Passport.js for authentication and MongoDB for user data storage. I've set up the OAuth client with the appropriate redirect URI, and I'm trying to handle the callback from the provider (Google in this case) to exchange the authorization code for an access token. However, I'm working with an scenario where the access token is not being retrieved correctly, resulting in the following behavior from the console: `behavior: Failed to fetch access token.` Here’s the code snippet where I configure the Passport strategy: ```javascript const passport = require('passport'); const GoogleStrategy = require('passport-google-oauth20').Strategy; const User = require('./models/User'); passport.use(new GoogleStrategy({ clientID: process.env.GOOGLE_CLIENT_ID, clientSecret: process.env.GOOGLE_CLIENT_SECRET, callbackURL: '/auth/google/callback' }, async (accessToken, refreshToken, profile, done) => { try { const user = await User.findOne({ googleId: profile.id }); if (user) { done(null, user); } else { const newUser = await new User({ googleId: profile.id, username: profile.displayName, thumbnail: profile._json.picture }).save(); done(null, newUser); } } catch (err) { console.behavior(err); done(err, null); } })); ``` I've made sure that the `GOOGLE_CLIENT_ID` and `GOOGLE_CLIENT_SECRET` environment variables are correct. When I go through the authorization process, the redirect to the callback URL works fine, but I don't see any tokens being passed to my callback handler. I tried logging the incoming request in the callback route: ```javascript app.get('/auth/google/callback', passport.authenticate('google', { failureRedirect: '/login' }), (req, res) => { console.log('Access Token:', req.user); res.redirect('/'); }); ``` When I log `req.user`, it returns `undefined` instead of the expected user object. I suspect I might be missing some configuration or step in the OAuth flow. I've also checked the scopes being requested, which include `'profile'` and `'email'`. Any insights on what might be going wrong here? This has been frustrating, and any guidance would be greatly appreciated! Thanks in advance! Could this be a known issue? I'm on CentOS using the latest version of Javascript. Any ideas what could be causing this?