nuxt-promote-yourself/server/services/passport.js

const passport = require('passport');
const LocalStrategy = require('passport-local');
const User = require('../models/user');
const keys = require('../keys');

// Only For Session Authentication !
passport.serializeUser(function(user, done) {
  done(null, user.id)
})

passport.deserializeUser(function(id, done) {
  User.findById(id, function(err, user) {
    done(err, user)
  })
})

passport.use(new LocalStrategy({
  usernameField: 'email',
  passwordField: 'password'
}, (email, password, done) => {
  User.findOne({email}, function(err, user) {
    if (err) { return done(err); }
    if (!user) { return done(null, false) }

    user.comparePassword(password, function(err, isMatch) {
      if (err) { return done(err); }
      if (!isMatch) { return done(null, false) }

      return done(null, user)
    })
  })
}))