app.js

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

/**
 * Bringing Routes
 */
const users = require('./routes/api/users');
const profile = require('./routes/api/profile');
const posts = require('./routes/api/posts');

const app = express();

/**
 * Body parser middleware
 */
app.use(bodyParser.urlencoded({extended:false}));
app.use(bodyParser.json());

/**
 * Database connection
 * @type {string}
 */
const db = require('./config/keys').mongoURI;
mongoose.connect(db)
    .then(() => console.log('DB connected'))
    .catch(err => console.log(err));

/**
 * Passport initialization
 */
app.use(passport.initialize());
require('./config/passport')(passport);

/**
 * Routes definition
 */
app.get('/',(req,res) => res.send('Hello'));
app.use('/api/users',users);
app.use('/api/profile',profile);
app.use('/api/posts',posts);

const port = process.env.PORT || 5000;

app.listen(port, () => console.log(`App running on port ${port}`));