I am trying to authenticate and login a user but it show error: Strategy#authenticate must be overridden by subclass, how can i fix this error
What could be the cause?
Passport.js
const LocalStrategy = require('passport').Strategy
const mongoose = require('mongoose')
const bcrypt = require('bcrypt')
const User = require('../models/User')
module.exports = function(passport) {
passport.use("local",
new LocalStrategy({usernameField:"email"}, (email, password, done)=>{
User.findOne({email:email})
.then(user=>{
if(!user){
return done(null, false,{message:"That email is not registered"})
}
bcrypt.compare(password, user.password, (err, isMatch)=>{
if(err) throw err
if(isMatch){
return done(null, user)
}else {
return done (null, false,{message:"password incorrect"})
}
})
})
.catch(err=>console.log(err))
})
)
passport.serializeUser(function (user, done) {
done(null, user.id)
})
passport.deserializeUser(function (id, done) {
User.findById(id, function (err, user) {
done(err, user)
})
})
}
Login.js
const express = require('express');
const passport = require("passport");
const router = express.Router();
/* GET users listing. */
router.get('/login', function (req, res, next) {
res.render('login')
})
router.post('/login', function(req, res, next) {
passport.authenticate('local', function(err, user, info) {
if (err) { return next(err); }
if (!user) { return res.redirect('/login'); }
req.logIn(user, function(err) {
if (err) { return next(err); }
return res.redirect('/');
});
})
(req, res, next);
});
module.exports = router
app.js
const express = require('express')
const app = express()
const mongoose = require('mongoose')
const bodyParser = require('body-parser')
const logIn = require('./routes/login')
const flash = require('connect-flash')
const session = require('express-session')
const passport = require("passport");
require('./config/passport')(passport)
app.use(bodyParser.urlencoded({extended : false}))
//express session
app.use(session({
secret:'secret',
resave: false,
saveUninitialized: true,
}))
app.use(passport.initialize())
app.use(passport.session())
//flash connect
app.use(flash())
app.use((req, res, next)=>{
res.locals.success_msg = req.flash('success_msg')
res.locals.failure_msg = req.flash('error_msg')
next()
})
app.use(logIn)
This error occurs when passport fails to instantiate an instance of strategy ,I can't see anything wrong in your code , so I suggest you uninstall passport and install it back again