Failed API interaction | TypeError: app.route is not a function at module.exports

I have been stumped by a server api for my ember project for a week now. I cannot get a modular api to work and it's driving me nuts.

Console related:
mongod, node server, heroku local(or ember s)

First, the error I'm trying to resolve: (shows when going to http://localhost:4500/notes)

TypeError: app.route is not a function
    at module.exports (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\routes\noteRoute.js:21:9)
    at Layer.handle [as handle_request] (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:317:13)
    at C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:335:12)
    at next (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:275:10)
    at jsonParser (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\body-parser\lib\types\json.js:109:7)
    at Layer.handle [as handle_request] (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:317:13)
    at C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:335:12)
    at next (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:275:10)
    at urlencodedParser (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\body-parser\lib\types\urlencoded.js:91:7)
    at Layer.handle [as handle_request] (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:317:13)
    at C:\Users\Accurate\Projects\emberjs\accurate2\AccurateEmber2\api\node_modules\express\lib\router\index.js:284:7

Here is my folder schema:
api
- -controllers
- - - - noteController.js
- -models
- - - - noteModel.js
- -node_modules
- -routes
- - - - noteRoute.js
- -package-lock.json
- -package.json
- -server.js
app
- - serializers
- - - - note.js
config
dist
node_modules
public
server
etc...

---

My server.js file:

// Allow POST, GET, PUT, DELETE, OPTIONS
app.use(function (req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', 'http://localhost:4200');
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    res.header('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS');
    next();
});

//DB Vars
var uri = 'mongodb://localhost/Ember2';

// mongoose instance connection url connection
mongoose.Promise = global.Promise;

var options = {
    useMongoClient: true
};
mongoose.connect(uri, function (err) {
    if (err) {
        console.log('ERROR connecting to: ' + uri + '. ' + err);
    } else {
        console.log('Succeeded connected to: ' + uri);
    }
});

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());


var note = require('./routes/noteRoute'); //importing route
app.use('/notes', note);

//middleware catch
app.use(function (req, res) {
    res.status(404).send({ url: req.originalUrl + ' not found' })
});

app.listen(port);


console.log('RESTful API server started on: ' + port);

My noteRoute.js: (commented code are alternatives I have tried and still received the error. Essentially, I am unable to interact with my database.)

'use strict';
/*let router = require('express').Router();
let note = require('../controllers/noteController');

router.post('api/notes', note.create_a_note);
router.get('api/notes', function (req, res){
    note.list_all_notes});

module.exports = router;*/

module.exports = function (app) {
    let note = require('../controllers/noteController');
    let router = require('express').Router();

    router.post('api/notes', note.create_a_note);
    router.get('api/notes', function (req, res) {
        note.list_all_notes
    });

    // note Routes
    /*app.route('/notes')
        .get(note.list_all_note)
        .post(note.create_a_note);

    app.route('/notes/:noteId')
        .get(note.read_a_note)
        .put(note.update_a_note)
        .delete(note.delete_a_note);*/
};

My noteModel.js:

'use strict'

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

let NoteSchema = new Schema({
    title: { 
        type: String, 
        required: 'Kindly enter the name of the note' 
    },
    content: { 
        type: String 
    },
    author: { 
        type: String 
    }
});

module.exports = mongoose.model('Notes', NoteSchema);

My noteController.js:

'use strict';

let mongoose = require('mongoose'),
    Note = mongoose.model('Notes');

exports.list_all_notes = function(req, res){
    Note.find({}, function(err, note){
        if (err)
            res.send(err);
        res.json(note);
    });
};

exports.create_a_note = function(req, res){
    let new_note = new Note(req.body);
    new_note.save(function (err, note){
        if (err)
            res.send(err);
        res.json(note);
    });
};

exports.read_a_note = function(req, res){
    Note.findById(req.params.noteId, function(err, note){
        if (err)
            res.send(err);
        res.json(note);
    });
};

exports.delete_a_note = function(req, res){
    Note.remove({
        _id: req.params.noteId
    }, function(err, task){
        if (err)
            res.send(err);
        res.json({ message: 'Note successfully deleted.' });
    });
};

My note.js serializer:

import DS from 'ember-data';

export default DS.RESTSerializer.extend({
    /*primaryKey: '_id',
    serializeId: function (id) {
        return id.toString();
    }*/
    normalizeResponse(store, primaryModelClass, payload, id, requestType){
        payload = {notes: payload};

        payload.notes.foreach((note) => {
            note.id = note._id;
            delete note._id;
        });

        return this._super(store, primaryModelClass, payload, id, requestType);
    }
});

I have been using a combination of Postman and the browser to check on API status.
Having this modularized API is a must as the application will grow much larger. Having all of the get, post, put, delete, etc. in the server.js will be a mess.