server.js

'use strict';

const config = require('config');
const log = require('npmlog');
const app = require('./app');
const http = require('http');

const port = config.port;
const host = config.host;

log.level = config.log.level;
app.set('port', port);

let server = http.createServer(app);

server.on('error', err => {
    if (err.syscall !== 'listen') {
        throw err;
    }

    let bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port;

    // handle specific listen errors with friendly messages
    switch (err.code) {
        case 'EACCES':
            log.error('Express', '%s requires elevated privileges', bind);
            return process.exit(1);
        case 'EADDRINUSE':
            log.error('Express', '%s is already in use', bind);
            return process.exit(1);
        default:
            throw err;
    }
});

server.on('listening', () => {
    let addr = server.address();
    let bind = typeof addr === 'string' ? 'pipe ' + addr : 'port ' + addr.port;
    log.info('Express', 'WWW server listening on %s', bind);
});

server.listen(port, host);