Google Authentication using passport-google not working - passport.js

Question

Here's the code i typed.
var passport = require("passport");
var GoogleStrategy = require("passport-google-oauth").OAuth2Strategy;
// Use the GoogleStrategy within Passport.
// Strategies in Passport require a `verify` function, which accept
// credentials (in this case, an accessToken, refreshToken, and Google
// profile), and invoke a callback with a user object.
passport.use(
new GoogleStrategy(
{
clientID: '28013134812-qc5lbogacg4cf42etiruqveskh8vaqgh.apps.googleusercontent.com',
clientSecret: 'secret! i can't type secret here',
callbackURL: "www.example.com.com/auth/google/callback",
},
function (accessToken, refreshToken, profile, done) {
User.findOrCreate({ googleId: profile.id }, function (err, user) {
return done(err, user);
});
}
)
);
// GET /auth/google
// Use passport.authenticate() as route middleware to authenticate the
// request. The first step in Google authentication will involve
// redirecting the user to google.com. After authorization, Google
// will redirect the user back to this application at /auth/google/callback
app.get(
"/auth/google",
passport.authenticate("google", {
scope: ["https://www.googleapis.com/auth/plus.login"],
})
);
// GET /auth/google/callback
// Use passport.authenticate() as route middleware to authenticate the
// request. If authentication fails, the user will be redirected back to the
// login page. Otherwise, the primary route function function will be called,
// which, in this example, will redirect the user to the home page.
app.get(
"/auth/google/callback",
passport.authenticate("google", { failureRedirect: "/login" },
function (req, res) {
res.redirect("/");
})
);
ReferenceError: User is not defined
at Strategy._verify (C:\Users\hp\short.nner\server.js:64:7)
at C:\Users\hp\short.nner\node_modules\passport-oauth2\lib\strategy.js:202:24
at C:\Users\hp\short.nner\node_modules\passport-google-oauth20\lib\strategy.js:122:5
at passBackControl (C:\Users\hp\short.nner\node_modules\oauth\lib\oauth2.js:134:9)
at IncomingMessage. (C:\Users\hp\short.nner\node_modules\oauth\lib\oauth2.js:157:7)
at IncomingMessage.emit (node:events:341:22)
at endReadableNT (node:internal/streams/readable:1294:12)
at processTicksAndRejections (node:internal/process/task_queues:80:21)
I copied the above code from passport docs. Does anyone know why I am getting this error?
What actually is User here?
i think something's wrong with this code
function (accessToken, refreshToken, profile, done) {
User.findOrCreate({ googleId: profile.id }, function (err, user) {
return done(err, user);
});
}

Answer 1

Just put correct callback URL here callbackURL: "http://localhost:3000.com/auth/google/callback", and define User. That's it