How to use express.js and passport.js with G Suite SAML Apps SSO

app.js

const express = require('express')
const SamlStrategy = require('passport-saml').Strategy
const passport = require('passport')

const cookieSession = require('cookie-session')
const cookieParser = require('cookie-parser')

// Create express instance
const app = express()

// Configure your cookie session or alternatives
app.use(cookieParser())
app.use(cookieSession({
  name: 'session',
  keys: ['super secret'],
  maxAge: 2 * 24 * 60 * 60 * 1000 // 2 days
}))

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

passport.use(new SamlStrategy({
    protocol: 'https://',
    entryPoint: 'https://accounts.google.com/o/saml2/idp?idpid=', // SSO URL (Step 2)
    issuer: 'https://.../sp', // Entity ID (Step 4)
    path: '/auth/saml/callback', // ACS URL path (Step 4)
    cert: "MIICizCCAfQCCQCY8tKaMc0BMjANBgkqh ... W==", // Certificate without begin and end
  }, function (profile, done) {
    // Parse user profile data
    done(null, {
      email: profile.email,
      name: profile.name
    })
  })
)

passport.serializeUser(function (user, done) {
  done(null, user)
})

passport.deserializeUser(function (user, done) {
  done(null, user)
})

app.get('/login', passport.authenticate('saml', {
  successRedirect: '/',
  failureRedirect: '/login'
}))

app.get('/logout', function (req, res) {
  req.logout()
  res.end('You have logged out.')
})

app.post('/auth/saml/callback', passport.authenticate('saml', {
  failureRedirect: '/error',
  failureFlash: true
}), function (req, res) {
  res.redirect('/')
})

// Securing every path in production.
app.all('*', function (req, res, next) {
  if (req.isAuthenticated() || process.env.NODE_ENV !== 'production') {
    next()
  } else {
    res.redirect('/login')
  }
})

init.sh

# https://github.com/bergie/passport-saml
yarn add passport passport-saml

Hi,
I have changed all the required details and trying to login but the page redirect me to google login page again and again. In another browser its forwarding the request and loading infinitely. Please help me to solve the issue.