index.js

const express = require('express');
const logger = require('morgan');
const bodyParser = require('body-parser');
const cors= require('cors');
const app = express();

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

// parse application/json
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.text());
app.use(bodyParser.json({ type: 'application/json'}));

// CORS
// This allows client applications from other domains use the API Server
app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
});


//////////////////
// API Queries
//////////////////

const mountRoutes = require('./server/routes');
mountRoutes(app);

//////////////////
// Server Setup
//////////////////

app.set("env", process.env.NODE_ENV || "development");
app.set("host", process.env.HOST || "0.0.0.0");
app.set("port", process.env.PORT || 3000);

app.listen(app.get("port"), function () {
    console.log('\n' + '**********************************');
    console.log('REST API listening on port ' + app.get("port"));
    console.log('**********************************' + '\n');
});


////////////////////
// Error Handlers
////////////////////

// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status( err.code || 500 )
        .json({
            status: 'error',
            message: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500)
    .json({
        status: 'error',
        message: err.message
    });
});


module.exports = app;