app.js

const fs = require('fs');
const path = require('path');

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

const placesRoutes = require('./routes/places-routes');
const usersRoutes = require('./routes/users-routes');
const HttpError = require('./models/http-error');
require('dotenv').config();

const app = express();

app.use(bodyParser.json());

app.use('/uploads/images', express.static(path.join('uploads', 'images')));

app.use((req, res, next) => {
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader(
        'Access-Control-Allow-Headers',
        'Origin, X-Requested-With, Content-Type, Accept, Authorization'
    );
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PATCH, DELETE');
    next();
});

app.use('/api/places', placesRoutes);
app.use('/api/users', usersRoutes);

app.use((req, res, next) => {
    const error = new HttpError('Could not find this route.', 404);
    throw error;
});

app.use((error, req, res, next) => {
    if (req.file) {
        fs.unlink(req.file.path, (err) => {
            console.log(err);
        });
    }
    if (res.headerSent) {
        return next(error);
    }
    res.status(error.code || 500);
    res.json({message: error.message || 'An unknown error occurred!'});
});

// MongoDB connection
mongoose
    .connect(
        process.env.DB_URI, {
            useNewUrlParser: true,
            useUnifiedTopology: true
        }
    )
    .then((res) => console.log("Database connected on localhost 5000!"))
    .then(() => {
        app.listen(5000);
    })
    .catch(err => {
        console.log(err);
    });