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Mongoose MVC - TypeError: ItemModel is not a constructor

I'm trying to follow MVC pattern by defining/exporting a model, and using this model in the controller. However, I'm getting an error: TypeError: ItemModel is not a constructor.
I've followed several other examples and am unable to see why this error is occurring.
The file structure is as follows:
src\db_test.js
src\controller\Item.js
src\models\Item.js
const mongoose = require('mongoose');
const ItemSchema = new mongoose.Schema({
"name": String
});
var ItemModel = mongoose.model('Item', ItemSchema);
module.export = ItemModel;
controller\Item.js
var ItemModel = require('../models/Item');
var itemController = {};
itemController.save = function(obj) {
var model = new ItemModel(obj); // Error here
model.save(function(err, item) {
if (err) {
console.log('Failed to save');
return;
}
console.log('saved successfully!');
});
}
module.exports = itemController;
db_test.js
const ItemController = require('./controller/Item');
var testItem = {
"name": "ItemName"
};
ItemController.save(testItem);
Output:
\src\controller\Item.js:18
var model = new ItemModel(obj); // Error here
^
TypeError: ItemModel is not a constructor
at Object.itemController.save (\src\controller\Item.js:5:4)
at Object.<anonymous> (\src\db_test.js:7:6)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

I think there is a missing letter.
Item.js
module.export = ItemModel
change
module.exports = ItemModel

koa-router error router.routes is not a function

When I try to use koa-route 3.2.0 example from their website, I got error message router.routes is not a function
const Koa = require('koa');
const router = require('koa-route');
const app = new Koa();
app.use(logger());
router.get('/users', (ctx, next) => {
ctx.response.body =`<h1>Hello!</h1>`;
});
app.use(router.routes())
.use(router.allowedMethods());
// don't listen to this port if the app is required from a test script
if (!module.parent) {
app.listen(1337);
console.log('listening on port: 1337');
}
I got error message:
app.use(router.routes())
^
TypeError: router.routes is not a function
at Object.<anonymous> (/Projects/shoucast-front-end-prototype/script/server.js:40:16)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
at Function.Module.runMain (module.js:605:10)
at startup (bootstrap_node.js:158:16)
at bootstrap_node.js:575:3
When I try to change
const router = require('koa-route');
to
var router = require('koa-router')();
I got error message:
const router = require('koa-route')();
^
TypeError: require(...) is not a function
at Object.<anonymous> (/Projects/shoucast-front-end-prototype/script/server.js:2:36)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
at Function.Module.runMain (module.js:605:10)
at startup (bootstrap_node.js:158:16)
at bootstrap_node.js:575:3

Looks like you've installed the newer version, available at https://github.com/alexmingoia/koa-router/tree/master
You need to use new Router() instead.
Also looks like you're mixing up koa-router with koa-route, which are two different packages.
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
router.get('/', function (ctx, next) {
// ctx.router available
});
app
.use(router.routes())
.use(router.allowedMethods());

'<' not recognized when using reactJS in server-side node.js

I want to pass React Component from server-side, which is written in node.js.
Code(server.js):
var ReactDOMServer = require('react-dom/server');
var ReactApp = require('./console/ReactApp');
app.get('*', function(req, res, next){
var reactHtml = ReactDOMServer.renderToString(<ReactApp />);
res.render('index',
{reactOutput: reactHtml});
});
console/ReactApp.js:
var React = require('react');
var ReactApp = React.createClass({
render: function() {
return <div>Hello World</div>;
}
});
module.exports = ReactApp;
In both files, '<>' generated SyntaxError when running node server.js
var reactHtml = ReactDOMServer.renderToString(<ReactApp />);
^
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:373:25)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (/.../www.js:7:11)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)

that's is JSX. You need to transpile it before use or run it with babel-node (the latter is NOT a recommended method).
Or you can use transpiled code like this:
var reactHtml = ReactDOMServer.renderToString(React.createElement(ReactApp));
See full api of React.createElement here

Problems with loggers module definition in ExpressJS

I have my nodejs project, and I want to separate loggers from my route.js to have a clean code.
But I have the next problem, when I try to load my logger to the route.js file, it shows me the next error:
TypeError: loggers.getTicketLogger is not a function
at Object.<anonymous> (/home/ismael/projects/nodejs-ticketing/routes/ticket.js:3:23)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Module.require (module.js:367:17)
at require (internal/module.js:16:19)
at Object.<anonymous> (/home/ismael/projects/nodejs-ticketing/server.js:49:1)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Function.Module.runMain (module.js:447:10)
at startup (node.js:141:18)
at node.js:933:3
I have the next code inside my loggers dir:
loggers/ticket.js
var log4js = require('log4js');
module.exports = function(){
getTicketLogger = function(){
var logger = null;
log4js.loadAppender('file');
log4js.addAppender(log4js.appenders.file(__dirname + '/../log/ticket.log'), 'ticket-log');
logger = log4js.getLogger('ticket-log');
logger.setLevel('DEBUG');
return logger;
}
};
And my route.js file, has the next head
routes/ticket.js
var Ticket = require('../models/ticket'),
loggers = require('../loggers/ticket.js'),
log = loggers.getTicketLogger();
module.exports = function(app){
}
What I'm doing wrong, and how can improve the code to separate logger from route.js file.
Thanks you.

loggers/ticket.js should return an object that has your getTicketLogger method.
var log4js = require('log4js');
module.exports = function() {
var getTicketLogger = function(){
var logger = null;
log4js.loadAppender('file');
log4js.addAppender(log4js.appenders.file(__dirname + '/../log/ticket.log'), 'ticket-log');
logger = log4js.getLogger('ticket-log');
logger.setLevel('DEBUG');
return logger;
}
return { getTicketLogger: getTicketLogger };
};
Then in routes/ticket.js
var loggers = require('./../loggers/ticket.js')();
var log = loggers.getTicketLogger;
typeof loggers; // => object
typeof log; // => function

Node js , Error: can not find module

Here is the error which I get when I run nodejs app.js
module.js:340
throw err;
^
Error: Cannot find module 'share'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (/home/quicksilver/project/master/app.js:3:17)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
I am repeatedly getting this error :
I have already done npm install -g share several times ,but it has been no use.
var express = require('express')
var sharejs = require('share')
var connect = require('connect')
var AWS = require('aws-sdk');
//var zmq = require('zmq');
var app = express();
app.set('view options', {layout: false});
var problem={};
var sharejs_server;
AWS.config.loadFromPath('./awsconfig.json');
locomotive.boot('.', app.settings.env, function(err, app) {
var options = {};
if (err) { throw err; }
options.db = app.locals.db;
sharejs_server = sharejs.server.attach(app, options);
app.listen(app.locals.port, app.locals.ip, function () {
var addr = this.address();
console.log('listening on %s:%d', addr.address, addr.port);
});
});