Develop Reference

How to fix "TypeError: Cannot read property 'id' of undefined" error?

I am working on a app that uses databases and adds items to the user using the user ID which is its username, but when i try to add an item i get an error and i can't seem to figure out how to fix it. Here is the error:
TypeError: Cannot read property 'id' of undefined
at C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\app.js:118:26
at Layer.handle [as handle_request] (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:281:22
at Function.process_params (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:335:12)
at next (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:275:10)
at SessionStrategy.strategy.pass (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\passport\lib\middleware\authenticate.js:343:9)
at SessionStrategy.authenticate (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\passport\lib\strategies\session.js:75:10)
at attempt (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\passport\lib\middleware\authenticate.js:366:16)
at authenticate (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\passport\lib\middleware\authenticate.js:367:7)
at Layer.handle [as handle_request] (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:317:13)
at C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\Users\Children\Desktop\Web Projects\Sermon_Tracker\node_modules\express\lib\router\index.js:335:12)
Here is where it is saying the problem is:
app.post("/workspace", function (req, res) {
const date = req.body.input1;
console.log(date);
//Once the user is authenticated and their session gets saved, their user details are saved to req.user.
console.log(req.user.id);
User.findById(req.user.id, function (err, foundUser) {
if (err) {
console.log(err);
} else {
if (foundUser) {
foundUser.item = date;
foundUser.save(function () {
res.redirect("/workspace");
});
}
}
});
});
Here is the full code:
//jshint esversion:6
require('dotenv').config();
const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require("mongoose");
const session = require('express-session');
const passport = require("passport");
const passportLocalMongoose = require("passport-local-mongoose");
const GoogleStrategy = require('passport-google-oauth20').Strategy;
const findOrCreate = require('mongoose-findorcreate');
const app = express();
const Schema = mongoose.Schema;
app.use(express.static("public"));
app.set('view engine', 'ejs');
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(session({
secret: "Our little item.",
resave: false,
saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());
mongoose.connect("mongodb://localhost:27017/userDB", { useNewUrlParser: true });
mongoose.set("useCreateIndex", true);
const userSchema = new mongoose.Schema({
email: String,
password: String,
googleId: String,
items: { type: [Schema.Types.ObjectId], ref: 'Item' }
});
const ItemSchema = new mongoose.Schema({
date: String,
loc: String,
title: String,
passage: String,
file: String
});
userSchema.plugin(passportLocalMongoose);
userSchema.plugin(findOrCreate);
const User = new mongoose.model("User", userSchema);
const Item = mongoose.model("Item", ItemSchema);
passport.use(User.createStrategy());
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 GoogleStrategy({
clientID: process.env.CLIENT_ID,
clientSecret: process.env.CLIENT_SECRET,
callbackURL: "http://localhost:3000/auth/google/secrets",
userProfileURL: "https://www.googleapis.com/oauth2/v3/userinfo"
},
function (accessToken, refreshToken, profile, cb) {
console.log(profile);
User.findOrCreate({ googleId: profile.id }, function (err, user) {
return cb(err, user);
});
}
));
app.get("/", function (req, res) {
res.redirect("/home");
});
app.get("/home", function (req, res) {
res.render("home");
});
app.get("/login", function (req, res) {
res.render("login");
});
app.get("/signup", function (req, res) {
res.render("signup");
});
app.get("/workspace", function (req, res) {
User.find({ "items": { $ne: null } }, function (err, foundUsers) {
if (err) {
console.log(err);
} else {
if (foundUsers) {
res.render("workspace", { itemList: foundUsers });
}
}
});
});
app.post("/workspace", function (req, res) {
const date = req.body.input1;
console.log(date);
//Once the user is authenticated and their session gets saved, their user details are saved to req.user.
console.log(req.user.id);
User.findById(req.user.id, function (err, foundUser) {
if (err) {
console.log(err);
} else {
if (foundUser) {
foundUser.item = date;
foundUser.save(function () {
res.redirect("/workspace");
});
}
}
});
});
app.get("/logout", function (req, res) {
req.logout();
res.redirect("/");
});
app.post("/signup", function (req, res) {
User.register({ username: req.body.username }, req.body.password, function (err, user) {
if (err) {
console.log(err);
res.redirect("/signup");
} else {
passport.authenticate("local")(req, res, function () {
res.redirect("/workspace");
});
}
});
});
app.post("/login", function (req, res) {
const user = new User({
username: req.body.username,
password: req.body.password
});
req.login(user, function (err) {
if (err) {
console.log(err);
} else {
passport.authenticate("local")(req, res, function () {
res.redirect("/workspace");
});
}
});
});
app.listen(3000, function () {
console.log("Server started on port 3000.");
});
How can i fix it? I tried multiple things but none of them work.

Ok i figured out the problem and the answer, i had put id instead of _id! So that is why is gave me the error! But i do still have a question, how can i save the date in the item schema? It is this foundUser.item = date;, here is the code:
app.post("/workspace", function (req, res) {
const date = req.body.input1;
console.log(date);
//Once the user is authenticated and their session gets saved, their user details are saved to req.user.
console.log(req.user._id);
User.findById(req.user._id, function (err, foundUser) {
if (err) {
console.log(err);
} else {
if (foundUser) {
foundUser.item = date;
foundUser.save(function () {
res.redirect("/workspace");
});
}
}
});
});

REST API new users not posting to MongoDB

I am new to building REST API's, and I am trying to enter new user information into a collection called 'Users', however, when I submit the information I get Cannot POST /register
Below is my code
server.js
require('dotenv').config()
const express = require('express')
const app = express()
const mongoose = require('mongoose')
const expressValidator = require('express-validator')
mongoose.connect(process.env.DATABASE_URL, { useNewUrlParser: true , useUnifiedTopology: true })
const db = mongoose.connection
db.on('error', (error) => console.error(error))
db.once('open', () => console.log('Connected to Database'))
app.use(express.json())
const articlesRouter = require('./routes/articles')
app.use('/articles', articlesRouter)
const userRouter = require('./routes/users')
app.use('/register', userRouter)
app.set('view-engine', 'ejs')
app.use(express.urlencoded({ extended: false }))
app.get('/', (req, res) => {
res.render('index.ejs')
})
app.get('/login', (req, res) => {
res.render('login.ejs')
})
app.post('/login', (req, res) => {
})
app.get('/register', (req, res) => {
res.render('register.ejs')
})
app.listen(3000, () => console.log('Server Started'))
Users model
const mongoose = require('mongoose')
const bcrypt = require('bcrypt')
var userSchema = new mongoose.Schema({
firstName: String,
lastName: String,
email: String,
password: String,
permissionLevel: Number,
created: Date},
{ collection: 'Users'});
module.exports = mongoose.model('Users', userSchema);
module.exports.createUser = function(newUser, callback){
bcrypt.genSalt(10, function(err, salt) {
bcrypt.hash(newUser.password, salt, function(err, hash) {
newUser.password = hash;
newUser.save(callback);
});
});
}
module.exports.getUserByEmail = function(email, callback){
var query = {email: email};
User.findOne(query, callback);
}
module.exports.getUserById = function(id, callback){
user.findById(id, callback);
}
module.exports.comparePassword = function(candidatePassword, hash, callback) {
bcrypt.compare(candidatePassword, hash, function(err, isMatch){
if(err) throw err;
callback(null, isMatch)
});
}
users routes
const express = require('express')
const router = express.Router()
const Users = require('../models/users')
const passport = require('passport')
const LocalStrategy = require('passport-local').Strategy
//Register Page - GET
router.get('/register', (req, res) => {
res.render('register.hbs', {
pageTitle: 'register'
});
});
//Login Page - GET
router.get('/login', (req, res) => {
res.render('login.hbs', {
pageTitle: 'login'
});
});
//Register - POST
router.post('/', (req, res) => {
var firstName = req.body.firstName;
var lastName = req.body.lastName;
var email = req.body.email;
var password = req.body.password;
//validations
req.checkBody('firstName', 'Your First Name is Required').notEmpty();
req.checkBody('lastName', 'Your Last Name is Required').notEmpty();
req.checkBody('email', 'A valid email is required').isEmail();
req.checkBody('password', 'An Account Passowrd Is Required').notEmpty();
var errors = req.validationErrors();
if (errors) {
res.render('register', {
errors:errors
});
} else {
var newUser = new newUser({
firstName: firstName,
lastName: lastName,
email: email,
password: password,
});
User.createUser(newUser, function(err, user) {
if(err) throw(err);
console.log(user);
});
req.flash('success_message', "You are now registered!");
res.redirect('/login');
}
});
passport.use(new LocalStrategy({
email: 'email'
},
function(email, password, done){
Users.getUserByEmail(email, function(err, Users){
if(err) throw err;
if(!Users){
return done(null, false, {message: 'Unknown Email Address'});
}
Users.comparePassword(password, user.password, function(err, ismatch){
if(err) throw err;
if(ismatch){
return done (null, user);
} else {
return done(null, false, {message: 'Invalid Passowrd'});
}
});
});
}));
passport.serializeUser(function(user, done){
done(null, user.id);
});
passport.deserializeUser(function(id, done) {
Users.getUserByID(id, function(err, user) {
done(err, user)
});
});
router.post('/login', passport.authenticate('local', {
successRedirect: '/dashboard',
failureRedirect: '/login',
successFlash: 'Welcome',
failureFlash: 'Invalid Email or Passowrd!'
}), function(req, res) {
res.redirect('/');
});
router.get('/logout', function(req, res) {
req.logout();
req.flash('Success_message', 'You are now logged out!')
res.redirect('/');
});
module.exports = router
I suspect the conflict is between the router /register and the my 'Users' collection. I'm just unable to pinpoint what the issue could be.
Any help would be greatly appreciated

Your userRouter is mounted on /users (from your code: app.use('/users', userRouter), meaning that all the routes you declared in the router are prefixed by /users).
Try calling POST /users/register.

You're using users routes file at /users route, so when you declare /register route in users routes file it become /users/register please send your REST API request to /users/register endpoint

Cannot save more than one user to MongoDB

I am using nodeJS with the expressJS server framework. This issue is regarding passportJS not saving more than 1 user to MongoDB.
Firstly, I set up email registration with passport-local and got that to work fine. Secondly, I set up passport-facebook which essentially broke my email registration somehow. Each registration (email & facebook) now only log in just 1 user, I have to keep deleting the user from mongodb to register again. When there is 1 user in the database and I try to register another - I receive the error below.
process.nextTick(function() { throw err; });
^
TypeError: Cannot read property '1' of null at model.mongodbErrorHandler (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose-mongodb-errors/lib/plugin.js:19:49)
at next (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/kareem/index.js:145:14)
at Kareem.execPost (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/kareem/index.js:193:3)
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/lib/model.js:219:35
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/lib/model.js:152:9
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/collection.js:524:20
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/collection.js:658:14
at handleCallback (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/utils.js:95:56)
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/bulk/unordered.js:465:9
at handleCallback (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/utils.js:95:56)
at resultHandler (/Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb/lib/bulk/unordered.js:413:5)
at /Users/tlr/Dropbox/Websites/app-one/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:455:18
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
I think the issue may lie around the User Schema because each Strategy saves different user information. Thus, local & facebook may not be marrying up properly in the database which causes an error? Correct me if I'm wrong.
The main files to look at are my userSchema (User.js), my routes file (index.js) where I include my FB Strategy and module imports, and my controller files (userController.js, authController.js) where I export my modules and functions.
User.js
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
mongoose.Promise = global.Promise;
const md5 = require('md5');
const validator = require('validator');
const mongodbErrorHandler = require('mongoose-mongodb-errors');
const passportLocalMongoose = require('passport-local-mongoose');
const userSchema = new Schema({
name: {
type: String,
required: 'Please supply a name',
trim: true,
},
email: {
type: String,
unique: true,
lowercase: true,
trim: true,
required: 'Please supply an email address',
validate: [validator.isEmail, 'Invalid Email Address']
},
id: String,
token: String
});
userSchema.plugin(passportLocalMongoose, { usernameField: 'email' });
userSchema.plugin(mongodbErrorHandler);
module.exports = mongoose.model('User', userSchema);
index.js
const express = require('express');
const mongoose = require('mongoose');
const passport = require('passport');
const User = mongoose.model('User');
const authIDs = require('../../oauth');
const authController = require('../controllers/authController');
const userController = require('../controllers/userController');
const FacebookStrategy = require('passport-facebook').Strategy;
const router = express.Router();
passport.use(new FacebookStrategy({
clientID: authIDs.facebook.clientID,
clientSecret: authIDs.facebook.clientSecret,
callbackURL: authIDs.facebook.callbackURL,
profileFields: ['id', 'emails', 'name'],
passReqToCallback : true
},
function(req, accessToken, refreshToken, profile, done) {
const newUser = new User();
newUser.id = profile.id;
newUser.token = accessToken;
newUser.name = profile.name.givenName;
newUser.email = profile.emails[0].value;
process.nextTick( function() {
User.findOne({id: profile.id}, (err, user) => {
if (err) {
return done(err);
}
if (!user) {
newUser.save().then( user => {
done( null, user );
} ).catch( err => {
done( err );
} );
} else {
return done(null, user);
}
});
});
}
));
router.get( '/login', userController.loginForm);
router.post( '/login', authController.login);
router.get( '/register', userController.registerForm);
router.post( '/register',
userController.validateRegister,
userController.register,
authController.login
);
router.get('/auth/facebook', authController.fbauth);
router.get('/auth/facebook/callback', authController.fbcallback);
router.get( '/logout', authController.logout);
router.get('/', (req, res) => {
res.render('home');
});
module.exports = router;
userController.js
const mongoose = require('mongoose');
const User = mongoose.model('User');
const promisify = require('es6-promisify');
exports.loginForm = (req, res) => {
res.render('login')
};
exports.registerForm = (req, res) => {
res.render('register')
};
exports.validateRegister = (req, res, next) => {
// express validator methods below
req.sanitizeBody('name');
req.checkBody('name', 'You must supply a name!').notEmpty();
req.checkBody('email', 'That email is not valid!').isEmail();
req.sanitizeBody('email').normalizeEmail({
remove_dots: false,
remove_extension: false,
gmail_remove_subaddress: false
});
req.checkBody('password', 'Password cannot be blank!').notEmpty();
req.checkBody('password-confirm', 'Confirmed password cannot be blank!').notEmpty();
req.checkBody('password-confirm', 'Oops! Your passwords do not match').equals(req.body.password);
const errors = req.validationErrors();
if (errors) {
req.flash('error', errors.map(err => err.msg));
res.render('register', { body: req.body, flashes: req.flash() });
return;
}
next();
};
exports.register = async (req, res, next) => {
const user = new User({ name: req.body.name, email: req.body.email});
const register = promisify(User.register, User);
await register(user, req.body.password);
next();
};
authController.js
const passport = require('passport');
const mongoose = require('mongoose');
const User = mongoose.model('User');
exports.login = passport.authenticate('local', {
failureRedirect: '/login',
failureFlash: 'Failed Login!',
successRedirect: '/',
successFlash: 'You are now logged in!'
});
exports.fbauth = passport.authenticate('facebook', {scope: ['email']});
exports.fbcallback = passport.authenticate('facebook', {
failureRedirect: '/login',
failureFlash: 'Failed Login!',
successRedirect: '/',
successFlash: 'You are now logged in!'
});
exports.logout = (req, res, next) => {
req.logout();
req.flash('success', 'You successfully logged out!');
res.redirect('/login')
};
Any suggestions on a fix would be suuuuuuuuper duuuuuuper highly appreciated.

OH MY GOD after hours of trying, like most problems solved in coding, this one was terribly embarrassing.
Because I'm using the code as mentioned in the question above, you can see I'm implementing both a local email registration as well as a passport-facebook authentication. So... What was causing that confusing error was the following code was like this:
passport.serializeUser(User.serializeUser(), function(user, done) {
done(null, user.id);
});
passport.deserializeUser(User.deserializeUser(), function(id, done) {
User.findById(id, function(err, user) {
done(err, user);
});
});
instead of simply being like this:
passport.serializeUser(User.serializeUser(), function(user, done) {
done(null, user);
});
passport.deserializeUser(User.deserializeUser(), function(user, done) {
done(null, user);
});

MEAN App error expected object

I am trying to code a mean authentication app. Right now i can create user in mongodb via postman but when i try to authenticate it,if it has wrong username or password it gives proper feedback,wrong password etc, but if it matches correct username and password on database, server shutdowns, it doesnt gives any feedback on postman and it gives the following error on server terminal:
(node:11262) DeprecationWarning: Mongoose: mpromise (mongoose's
default promise library) is deprecated, plug in your own promise
library instead: http://mongoosejs.com/docs/promises.html
/home/cagdas/Desktop/basictest/node_modules/jsonwebtoken/sign.js:90
throw err;
^
Error: Expected object
at validate
(/home/cagdas/Desktop/basictest/node_modules/jsonwebtoken
/sign.js:35:11) at Object.module.exports [as sign]
(/home/cagdas/Desktop/basictest/node_modules/jsonwebtoken
/sign.js:101:7) at User.comparePassword
(/home/cagdas/Desktop/basictest/routes/users.js:40:26)
at bcrypt.compare (/home/cagdas/Desktop/basictest/models/user.js:52:6)
at
/home/cagdas/Desktop/basictest/node_modules/bcryptjs/dist
/bcrypt.js:297:21
at /home/cagdas/Desktop/basictest/node_modules
/bcryptjs/dist/bcrypt.js:1353:21
at Immediate.next (/home/cagdas/Desktop/basictest/node_modules
/bcryptjs/dist/bcrypt.js:1233:21)
at runCallback (timers.js:672:20)
at tryOnImmediate (timers.js:645:5)
at processImmediate [as _immediateCallback] (timers.js:617:5)
This is my code:
app.js:
const express = require('express') ;
const path = require('path');
const bodyParser = require('body-parser');
const cors = require('cors');
const passport = require('passport');
const mongoose = require('mongoose');
const config = require('./config/database');
// Connect to Database
mongoose.connect(config.database, { useMongoClient: true });
// On Connection
mongoose.connection.on('connected', () => {
console.log('Connected to database '+config.database);
});
// On Error
mongoose.connection.on('error', (err) =>{
console.log('Database error: '+err);
});
const app = express();
const users = require('./routes/users');
// Port Number
const port = 3000;
// Cors Middleware
app.use(cors());
// Set Static Folder
app.use(express.static(path.join(__dirname, 'public')));
// Body Parser Middleware
app.use(bodyParser.json());
// Passport Middleware
app.use(passport.initialize());
app.use(passport.session());
require('./config/passport')(passport);
app.use('/users', users);
// Index Route
app.get('/', (req, res) => {
res.send('Invalid Endpoint');
});
// Start Server
app.listen(port, () => {
console.log('Server started on port '+port);
});
users.js:
const express = require('express');
const router = express.Router();
const passport = require('passport');
const jwt = require('jsonwebtoken');
const User = require('../models/user');
const config = require('../config/database');
// Register
router.post('/register', (req, res, next) => {
let newUser = new User({
name: req.body.name,
email: req.body.email,
username: req.body.username,
password: req.body.password
});
User.addUser(newUser, (err, user) =>{
if(err){
res.json({success: false, msg:'Failed to register user'});
} else {
res.json({success: true, msg:'User registered'});
}
});
});
// Authenticate
router.post('/authenticate', (req, res, next) => {
const username = req.body.username;
const password = req.body.password;
User.getUserByUsername(username, (err, user) => {
if(err) throw err;
if(!user){
return res.json({success: false, msg: 'User not found'});
}
User.comparePassword(password, user.password, (err, isMatch) => {
if(err) throw err;
if(isMatch){
const token = jwt.sign(user, config.secret, {
expiresIn: 86400 // 1 day
});
res.json({
success: true,
token: 'JWT ' +token,
user: {
id: user._id,
name: user.name,
username: user.username,
email: user.email
}
});
} else {
return res.json({success: false, msg: 'Wrong Password'});
}
});
})
});
// Profile
router.get('/profile', (req, res, next) => {
res.send('PROFILE');
});
module.exports = router;
database.js:
module.exports = {
database: 'mongodb://localhost:27017/basictest',
secret: '123456789'
}
user.js:
const mongoose = require('mongoose');
const bcrypt = require('bcryptjs');
const config =require('../config/database');
// User Schema
const UserSchema = mongoose.Schema({
name: {
type: String
},
email: {
type: String,
required: true
},
username: {
type: String,
required: true
},
password: {
type: String,
required: true
}
});
const User = module.exports = mongoose.model('User', UserSchema);
module.exports.getUserById = function(id, callback){
User.findById(id, callback);
}
module.exports.getUserByUsername = function(username, callback){
const query = {username: username}
User.findOne(query, callback);
}
module.exports.addUser = function(newUser, callback){
bcrypt.genSalt(10, (err, salt) => {
bcrypt.hash(newUser.password, salt, (err, hash) => {
if(err) throw err;
newUser.password = hash;
newUser.save(callback);
});
});
}
module.exports.comparePassword = function(candidatePassword, hash,
callback){
bcrypt.compare(candidatePassword, hash, (err, isMatch) => {
if(err) throw err;
callback(null, isMatch);
});
}
passport.js
const JwtStrategy = require('passport-jwt').Strategy;
const ExtractJwt = require('passport-jwt').ExtractJwt;
const User = require('../models/user');
const config = require('../config/database');
module.exports = function(passport){
let opts = {};
opts.jwtFromRequest = ExtractJwt.fromAuthHeaderWithScheme('jwt');
opts.secretOrKey = config.secret;
passport.use(new JwtStrategy(opts, (jwt_payload, done) => {
User.getUserById(jwt_payload._id, (err, user) => {
if(err){
return done (err, false);
}
if(user){
return done(null, user);
} else {
return done(null, false);
}
});
}));
}

Solution - not user only { data: user }
const token = jwt.sign({data: user}, config.secret, {
expiresIn: 604800 // 1 week
});

Got the same error for a while and I suggest that you recreate a new object user (without the hashed password for security reason) and insert it into the sign function.
let restrictedUser = {
id: user._id,
username: user.username,
name: user.name,
email: user.email
}
const token = jwt.sign(restrictedUser, config.secret, {
expiresIn: "7d"
})
Hope this will help.

Not sure about this, But you can try this
"npm remove mongoose"
Then
"npm install mongoose#4.10.8 --save"
Hope it will help you..
Thanks...

Error: Unknown authentication strategy "local" (Express & Passport)

I'm trying to use passport authentication within express app.
router.get('/signup', (req ,res) => {
res.render('signup');
});
router.post('/signup', function(req, res, next) {
var username = req.body.username;
var password = req.body.password;
User.findOne({ username: username }, function(err, user) {
if(err) { return next(err); }
if(user) {
req.flash('error', 'User already exists');
return res.redirect('/signup');
}
var newUser = new User({
username: username,
password: password
});
newUser.save(next);
});
}, passport.authenticate('local', {
successRedirect: '/',
failureRedirect: '/signup',
failureFlash: true
}));
Every time I try to sign up test user, it works but it shows me an error like this:
Error: Unknown authentication strategy "local"
Can you advise me something.

It looks like you haven't setup Passport to use your passport-local strategy yet.
You'll need to import it, instantiate it, and then instruct Passport to use it. Here's an example:
var LocalStrategy = require('passport-local').Strategy;
passport.use(new LocalStrategy(
function(username, password, done) {
User.findOne({ username: username }, function (err, user) {
if (err) { return done(err); }
if (!user) { return done(null, false); }
if (!user.verifyPassword(password)) { return done(null, false); }
return done(null, user);
});
}
));
router.post('/signup', function(req, res, next) {
var username = req.body.username;
var password = req.body.password;
User.findOne({ username: username }, function(err, user) {
if(err) { return next(err); }
if(user) {
req.flash('error', 'User already exists');
return res.redirect('/signup');
}
var newUser = new User({
username: username,
password: password
});
newUser.save(next);
passport.authenticate('local', { failureRedirect: '/signup' }),
function(req, res) {
res.redirect('/');
});
});
});
Please read the documentation here for that plugin.
Also, here's an example app using that auth strategy.

Try using a callback function after local instead of passing an object. Something like this:
router.post("/register", function(req, res){
var newUser = new User({username: req.body.username});
User.register(newUser, req.body.password, function(err, user){
if(err){
req.flash("error", err.message); //such as the username is taken or no username entered etc.
res.redirect("/register");
} else {
passport.authenticate("local")(req, res, function(){
res.redirect("/");
});
}
});
});