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TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string Node.JS

I'm new on Node.js, and I try develop a simple movie api app with node.js and I created app with express-generator. I got this error and I couldn't handle it.
Firstly, I googled and I found github and stackoverflow I examined, but I couldn't resolve my issue.
firstly here error message :
TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type object
at validateString (internal/validators.js:112:11)
at extname (path.js:1231:5)
at new View (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/view.js:56:14)
at Function.render (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/application.js:570:12)
at ServerResponse.render (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/response.js:1008:7)
at /Users/tugrul/Projects/Learning Projects/movie-api/app.js:45:7
at Layer.handle_error (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/layer.js:71:5)
at trim_prefix (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:315:13)
at /Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:335:12)
at next (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:275:10)
at /Users/tugrul/Projects/Learning Projects/movie-api/app.js:34:3
at Layer.handle [as handle_request] (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:317:13)
at /Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/tugrul/Projects/Learning Projects/movie-api/node_modules/express/lib/router/index.js:335:12)
here is my package.json file:
{
"name": "movie-api",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "nodemon ./bin/www"
},
"dependencies": {
"cookie-parser": "~1.4.4",
"debug": "~2.6.9",
"express": "~4.16.1",
"http-errors": "~1.6.3",
"jade": "~1.11.0",
"mongoose": "^5.9.10",
"morgan": "~1.9.1"
}
}
and here is my app.js file:
const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const indexRouter = require('./routes/index');
const movieRouter = require('./routes/movie');
const directorRouter = require('./routes/director');
const app = express();
//mongodb connection
const db = require('./helper/db')();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/api/movies', movieRouter);
app.use('api/directors', directorRouter);
// catch 404 and forward to error handler
app.use((req, res, next) => {
next(createError(404));
});
// error handler
app.use((err, req, res, next) => {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render({error:{message:err.message, code: err.code}});
});
module.exports = app;
and here is my director router file:
const express = require('express');
const router = express.Router();
//Models
const Director = require('../models/Director');
// Get All Movies
router.get('/', (req, res, next) =>{
res.json({message: 'Director APIs'});
});
module.exports = router;
And here is my movie router file:
const express = require('express');
const router = express.Router();
//Models
const Movie = require('../models/Movie');
// Get All Movies
router.get('/', (req, res) =>{
const promise = Movie.find({ });
promise.then((data)=>{
res.json(data);
}).catch((err)=>{
res.json(err)
});
});
//Top 10 List
router.get('/top10', (req, res) =>{
const promise = Movie.find({ }).limit(10).sort({ imdb_score: -1});
promise.then((data)=>{
res.json(data);
}).catch((err)=>{
res.json(err)
});
});
//Add new movie
router.post('/add-movie',(req,res,next)=>{
//const {title,imdb_score,category,country,year} = req.body;
const movie = new Movie(req.body);
const promise = movie.save();
promise.then((data)=>{
res.json(data);
}).catch((err)=>{
res.json(err);
});
});
// Get Movie From ID
router.get('/:movie_id',(req,res,next)=>{
const promise = Movie.findById((req.params.movie_id));
promise.then((movie)=>{
if(!movie){
console.log(movie);
next({message : 'This movie can not found!', code:404});
}else{
res.json(movie);
}
}).catch((err)=>{
res.json(err);
});
});
//Update Movie
router.put('/:movie_id',(req,res,next)=>{
const promise = Movie.findByIdAndUpdate(
req.params.movie_id,
req.body,
{
new: true
});
promise.then((movie)=>{
if(!movie){
console.log(movie);
next({message : 'This movie can not found!', code:404});
}else{
res.json(movie);
}
}).catch((err)=>{
res.json(err);
});
});
//Delete movie
router.delete('/:movie_id',(req,res,next)=>{
const promise = Movie.findByIdAndRemove(
req.params.movie_id,
req.body);
promise.then((movie)=>{
if(!movie){
console.log(movie);
next({message : 'This movie can not found!', code:404});
}else{
res.json({status: 1});
}
}).catch((err)=>{
res.json(err);
});
});
// get movies between two years
router.get('/between/:start_year/:end_year',(req,res,next)=>{
const {start_year,end_year} = req.params;
const promise = Movie.find(
{
// gte = ">=", lte = "<="
year: { "$gte": parseInt(start_year), "$lte": parseInt(end_year)}
}
);
promise.then((movie)=>{
if(!movie){
console.log(movie);
next({message : 'This movie can not found!', code:404});
}else{
res.json(movie);
}
}).catch((err)=>{
res.json(err);
});
});
module.exports = router;
When I try to access http://localhost:3000/api/directors I get this error. Why? How can I handle it?
Could you help me please?

The problem is the following line:
res.render({error:{message:err.message, code: err.code}});
According to the docs, render expects the first parameter to be a path to the html-page to be rendered. Assuming there's a file called error in your views directory, changing it to
res.render('error', {error:{message:err.message, code: err.code}});
should fix the problem.
Regarding the second question from the comments:
The problem here is your middleware:
// catch 404 and forward to error handler
app.use((req, res, next) => {
next(createError(404));
});
Basically every request will result in an error, as you set up an ordinary middleware which will also be executed on a successful request. So you can probably just remove this middleware, as you have error handlers set up anyway.

throw new TypeError('app.use() requires middleware functions');

I am following an online course on Nodejs and was trying to implement basic authentication in my express application. But I am getting error on app.use(new localStrategy(User.Authenticate()); I have tried reinstalling the 'passport-local'. Why this error keeps persisting ?
var express = require('express'),
app = express(),
mongoose = require('mongoose'),
passport = require('passport'),
User = require('./models/user'),
bodyParser = require('body-parser'),
localStrategy = require('passport-local'); ;
passportLocalMongoose = require('passport-local-mongoose');
mongoose.connect('mongodb://localhost/auth_DB');
app.use(bodyParser.urlencoded({extended: true}));
app.use(express.static('images'));
app.use(require('express-session')({
secret: 'pppppqpqsda dasdqw ksndfkjnzmmuawt8ikweabmdsfj a',
resave: false,
saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(new localStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());
app.set('view engine', 'ejs');
app.get('/', function (req, res) {
// body...
res.render('home');
});
app.get('/secret', function (req, res) {
// body...
res.render('secret');
});
app.get('/register', function (req, res) {
// body...
res.render('signup');
});
app.post('/register', function (req, res) {
User.register(new User({username: req.body.username}), req.body.password, function(err, user){
if(err){
console.log(err);
return res.render('signup');
}
passport.authenticate('local')(req, res, function(){
res.redirect('/secret');
});
});
});
app.get('/login', function (req, res) {
// body...
res.render('signin');
});
app.post('/login', passport.authenticate('local',
{successRedirect: '/secret',
failureRedirect: '/login'} ),
function(req, res){});
app.listen(3000, function(){
console.log('Server Started!');
});
Package.json :-
{
"name": "test-auth",
"version": "1.0.0",
"description": "Testing the authentication",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Rishabh & Colt",
"license": "ISC",
"dependencies": {
"body-parser": "^1.17.1",
"ejs": "^2.5.6",
"express": "^4.15.2",
"express-session": "^1.15.2",
"mongoose": "^4.9.7",
"passport": "^0.3.2",
"passport-local": "^1.0.0",
"passport-local-mongoose": "^4.0.0"
}
}
User.js:-
var mongoose = require('mongoose');
var passportLocalMongoose = require('passport-local-mongoose');
var userSchema = new mongoose.Schema({
username: String,
password: String
});
userSchema.plugin(passportLocalMongoose);
module.exports = mongoose.model('User', userSchema);
Error:-
C:\Users\Atom\Project\testAuth\node_modules\express\lib\application.js:210
throw new TypeError('app.use() requires middleware functions');
^
TypeError: app.use() requires middleware functions
at EventEmitter.use (C:\Users\Atom\Project\testAuth\node_modules\express\lib\application.js:210:11)
at Object.<anonymous> (C:\Users\Atom\Project\testAuth\app.js:37:5)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
at bootstrap_node.js:508:3

You code has some typo. localStrategy is not a middleware for express. It can be used with passport.
Replace
app.use(new localStrategy(User.authenticate()));
with
passport.use(new localStrategy(User.authenticate()));

You seem to require the wrong module
You are requiring local strategy this way
LocalStrategy = require('passport-local');
but in docs, you need to add '.Strategy'
http://passportjs.org/docs/configure
LocalStrategy = require('passport-local').Strategy;

Can't get a proper error from passport-linkedin strategy

I can't seem to get some good feedback to properly diagnose the problem.
Right now I am getting a generic error I set up in the app.js file
Here is the error:
Not Found
404
Error: Not Found
at /Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/app.js:48:13
at Layer.handle [as handle_request] (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:312:13)
at /Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:280:7
at Function.process_params (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:330:12)
at next (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:271:10)
at /Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:618:15
at next (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:256:14)
at Function.handle (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:176:3)
at router (/Users/avonproductsinc/Dropbox/developer_folder/oauth-passport-securing-application/securing-app-OAuth-passport/node_modules/express/lib/router/index.js:46:12)
This is my code in my linkedin strategy:
var passport = require('passport');
var LinkedInStrategy = require('passport-linkedin').Strategy;
module.exports = function() {
passport.use(new LinkedInStrategy({
consumerKey: '77z7e2bq34ad0w',
consumerSecret: 'ajTJfuNTxLnDGlCK',
callbackURL: "http://127.0.0.1:3000/auth/linkedin/callback"
},
function(token, tokenSecret, profile, done) {
var user = {};
// user.email = profile.emails[0].value;
// user.image = profile._json.image.url;
user.displayName = profile.displayName;
user.linkedin = {};
user.linkedin.id = profile.id;
user.linkedin.token = tokenSecret;
done(null, user);
}));
};
And this is in my auth.js file
var express = require('express');
var passport = require('passport');
var router = express.Router();
router.route('/linkedin')
.get(passport.authenticate('linkedin'));
router.route('/linkedin/callback')
.get(passport.authenticate('linkedin', {
successRedirect: '/users',
failureRedirect: '/error'
}));
Any help is appreciated, naturally!
Update Jan 15 2017
app.js code:
var express = require('express'),
path = require('path'),
favicon = require('serve-favicon'),
logger = require('morgan'),
cookieParser = require('cookie-parser'),
bodyParser = require('body-parser'),
passport = require('passport'),
session = require('express-session'),
mongoose = require('mongoose'),
routes = require('./routes/index'),
users = require('./routes/users'),
auth = require('./routes/auth'),
app = express(),
db = mongoose.connect('mongodb://localhost/socialAgg');
app.use(require('node-sass-middleware')({
src: path.join(__dirname, 'public'),
dest: path.join(__dirname, 'public'),
indentedSyntax: true,
sourceMap: true
}));
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
// setting up passport middlware
app.use(session({secret: 'anything'}));
require('./config/passport')(app);
app.use('/', routes);
app.use('/users', users);
app.use('/auth', auth);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;

typeerror: app.use() requires middleware function

I am learning node.js with express template engine, I am following udemy course "learn node.js by building 10 projects", while following a lecture when professor run npm start localhost:3000 starts while mine pops up error indicating app.use requires middleware function
I have tried matching code and its same. Please help me to resolve the error i have been stuck here for hours tried a lot of edits but its not working for me.
When I am trying to run 'npm start' following error pops up
TypeError: app.use() requires middleware functions
Here is app.js code:
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var expressValidator = require('express-validator');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var bodyParser = require('body-parser');
var multer = require('multer');
var flash = require('connect-flash');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection;
var routes = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
//Handle File Uploads
app.use(multer({
dest: './uploads'
}));
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: false
}));
//Handle Express Sessions
app.use(session({
secret: 'secret',
saveUninitialied: true,
resave: true
}));
//Passport
app.use(passport.initialize());
app.use(passport.session());
//Validator
app.use(expressValidator({
errorFormatter: function(param, msg, value) {
var namespace = param.split('.'),
root = namespace.shift(),
formParam = root;
while (namespace.length) {
formParam += '[' + namespace.shift() + ']';
}
return {
param: formParam,
msg: msg,
value: value
};
}
}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(flash());
app.use(function(req, res, next) {
res.locals.messages = require('express-messages')(req, res);
next();
});
app.use('/', routes);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
Here is package.json file
{
"name": "nodeauth",
"version": "1.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"body-parser": "~1.12.4",
"cookie-parser": "~1.3.5",
"debug": "~2.2.0",
"express": "~4.12.4",
"jade": "~1.9.2",
"morgan": "~1.5.3",
"serve-favicon": "~2.2.1",
"mongodb": "*",
"mongoose": "*",
"connect-flash": "*",
"express-validator": "*",
"express-session": "*",
"express-messages": "*",
"passport": "*",
"passport-local": "*",
"passport-http": "*",
"multer": "*"
}
}
Here is updated app.js (after removing multar)
var express = require('express'),
path = require('path'),
favicon = require('serve-favicon'),
logger = require('morgan'),
cookieParser = require('cookie-parser'),
expressValidator = require('express-validator'),
session = require('express-session'),
passport = require('passport'),
LocalStrategy = require('passport-local').Strategy,
bodyParser = require('body-parser'),
flash = require('connect-flash'),
mongo = require('mongodb'),
mongoose = require('mongoose'),
db = mongoose.connection,
routes = require('./routes/index'),
users = require('./routes/users'),
app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// handle file uploads
//multer delted
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
// handle express sessions
app.use(session({
secret: 'keyboard cat',
resave: true,
saveUninitialized: true
}));
// passport
app.use(passport.initialize());
app.use(passport.session());
// validator
app.use(expressValidator({
errorFormatter: function(param, msg, value) {
var namespace = param.split('.'),
root = namespace.shift(),
formParam = root;
while(namespace.length) {
formParam += '[' + namespace.shift() + ']';
}
return {
param: formParam,
msg : msg,
value: value
};
}
}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
// flash
app.use(flash());
// express messages
app.use(function(req, res, next) {
res.locals.messages = require('express-messages')(req, res);
next();
});
app.get('*', function(req, res, next) {
res.locals.user = req.user || null;
next();
});
app.use('/', routes);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
//Express server
var http = require('http');
var server = http.createServer(app);
app.get('/', function(req, res) {
res.send("Hello World!");
});
server.listen(3000, 'localhost');
server.on('listening', function() {
console.log('Express server started on port %s at %s', server.address().port, server.address().address);
});
module.exports = app;
Thank You

It worked in this way. delete this line,
app.use(multer({ dest: './uploads' }));
and use it as,
var multer = require('multer');
var upload = multer({ dest: './uploads' });
I'm too following the same course

Change:
//Handle File Uploads
app.use(multer({
dest: './uploads'
}));
For something like:
app.use(multer({dest:'./uploads/'}).single('singleInputFileName'));
or
app.use(multer({dest:'./uploads/'}).array('multiInputFileName'));
And be aware to have something like:
<form action="/postPhotos" enctype="multipart/form-data">
<input type="file" name="singleInputFileName">
<input type="submit" value="Upload photo">
</form>
for the first case, or:
<form action="/postPhotos" enctype="multipart/form-data">
<input type="file" name="multiInputFileName" multiple>
<input type="submit" value="Upload photo">
</form>
For the second one, in your html.

This worked with me:
app.use(multer({
dest: path.join(__dirname, 'public/upload/temp')
}).any());

I was also doing that course & ran into the same problem. I resolved the error by following the Multer usage instructions from their github: https://github.com/expressjs/multer
Here is the code from their README:
var multer = require('multer')
var upload = multer({ dest: 'uploads/' })
& here is the code I used to overcome the error while doing that tutorial:
var multer = require('multer');
var upload = multer({ dest: './uploads' });
Hope it helps :)

you can simply use :
app.set(multer({dest: "./uploads"}));
it works for me too.

change only this line
app.use(multer({dest:'./uploads'}));
to
var upload =multer({dest:'./uploads'});

Replacing app.use(multer({dest:'./uploads'}));
to
var upload = multer({dest:'./uploads'});
worked for me.

Node.js Route error

Absolute beginner in node.js I was making that routes file which is below
productCategoryRouteConfig.js
function productCategoryRouteConfig(app){
this.app = app;
this.routesTable = [];
this.init();
}
productCategoryRouteConfig.prototype.init = function(){
this.addRoutes();
this.processRoutes();
}
productCategoryRouteConfig.prototype.processRoutes = function(){
this.routesTable.forEach(function(route){
if(route.requestType === 'get')
{
this.app.get(route.requestUrl, route.callbackFunction)
}
});
}
productCategoryRouteConfig.prototype.addRoutes = function(){
this.routesTable.push({
requestType: 'get',
requestUrl: '/createProductCategory',
callbackFunction: function(request, response){
response.render('createProductCategory', {title: "Create Product Category"});
}
});
}
module.exports = productCategoryRouteConfig;
my app.js file is below
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var routes = require('./routes/index');
var users = require('./routes/users');
var productCategoryRoute = require('./routes/productCategoryRouteConfig');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use('/bower_components', express.static(__dirname + '/bower_components'));
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
app.use('/users', users);
/******BEGIN CUSTOM ROUTES*********/
new productCategoryRoute(app)
/******END CUSTOM ROUTES*********/
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
but when run the npm server with this command DEBUG=nodecrud:* ./bin/www I get the following errors
/home/sharif/Sites/node/angularmysqlnode/nodecrud/routes/productCategoryRouteConfig.js:22
this.app.get(route.requestUrl, route.callbackFunction)
^
TypeError: Cannot read property 'get' of undefined
at /home/sharif/Sites/node/angularmysqlnode/nodecrud/routes/productCategoryRouteConfig.js:22:21
at Array.forEach (native)
at productCategoryRouteConfig.processRoutes (/home/sharif/Sites/node/angularmysqlnode/nodecrud/routes/productCategoryRouteConfig.js:18:22)
at productCategoryRouteConfig.init (/home/sharif/Sites/node/angularmysqlnode/nodecrud/routes/productCategoryRouteConfig.js:13:10)
at new productCategoryRouteConfig (/home/sharif/Sites/node/angularmysqlnode/nodecrud/routes/productCategoryRouteConfig.js:8:10)
at Object.<anonymous> (/home/sharif/Sites/node/angularmysqlnode/nodecrud/app.js:39:1)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
I have no clue why this error is coming up can you help me to fix this error please
any idea?

You are not passing in app in this line-
var productCategoryRoute = require('./routes/productCategoryRouteConfig');
do this
var productCategoryRoute = require('./routes/productCategoryRouteConfig')(app);
and put it after
var app = express();