app.js

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const morgan = require('morgan');
const mongoose = require('mongoose');
const path = require('path');

app.use(express.static(path.join(__dirname, '/public')));

//MongoDb
mongoose.connect('mongodb://test-user:mario123@ds157762.mlab.com:57762/test-db', { useNewUrlParser: true });

//Routes
const userRoutes = require('./api/routes/users');

//Add Morgan for pretty logging
app.use(morgan('dev'));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.use((req, res, next) => {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Tupe, Accept, Authorization");
    if (req.method === 'OPTIONS') {
        res.header('Access-Control-Allow-Methods', 'PUT, POST, PATCH, DELETE, GET');
        return res.status(200).json({});
    }
    next();
});

//Handling requests
app.get("/", function(req, res){
    res.sendFile(__dirname + '/tfg-web/index.html');
});

app.use('/users', userRoutes);

//If requests were not handled
app.use((req, res, next) => {
    const error = new Error('Not Found');
    error.status(404);
    next(error);
});

app.use((error, req, res, next) => {
    res.status(error.status || 500);
    res.json({
        error: {
            message: error.message
        }
    })
});

module.exports = app;