app.js

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

var db;

if(process.env.ENV == 'Test'){
    db = mongoose.connect('mongodb://localhost/bookAPI_test');
} else {
    db = mongoose.connect('mongodb://localhost/bookAPI');
}
var Book = require('./models/bookModel');

var app = express();
var port = process.env.PORT || 3000;

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

var bookRouter = require('./routes/bookRouter')(Book);

app.use('/api/books', bookRouter);

app.get('/', function (req, res) {
    res.send('Welcome to my API');
});

app.listen(port, function () {
    console.log('Running on port: ' + port);
});

module.exports = app;