server.js

var express = require('express');
var app = express();
var mongo = require('mongodb').MongoClient;
var bodyParser = require('body-parser');
var url = process.env.DB_URI;
var pkg = require('./package.json');
var path = require('path');

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

// Express only serves static assets in production
// because in dev we use webpack server

// use dotenv module to set NODE_ENV
//if (process.env.NODE_ENV === 'production') {

	// comment this line in development as in development
	// your webpack server is serving files
  app.use(express.static('client/build'));

//}


app.get('/api/polls', (req, res) => {
	mongo.connect(url, function(err, db) {
		if(err) throw err;
		db.collection('polls').find({}).toArray(function(err, docs){
			res.end(JSON.stringify(docs));
		});
	});
});

app.get('/api/poll/:name', (req, res) => {
	mongo.connect(url, function(err, db){
		if(err) throw err;
		db.collection('polls').findOne({"name": req.params.name}, function(err, doc){
			res.end(JSON.stringify(doc));
		});
	});
});

app.post('/api/newpoll', (req, res) => {
	mongo.connect(url, function(err,db){
		if(err) throw err;
		var name = req.body.name;
		var options = req.body.option.filter(opt => opt !== '').map(opt => {return {name: opt, votes: 0}});
		db.collection('polls').insert({name: name, options: options}, function(err, doc){
			res.redirect(pkg.client + '/poll/' + encodeURIComponent(doc.ops[0].name));
		});
	})
});

app.get('/api/addvote/:name/:option', (req, res) => {
	var option = req.params.option;
	mongo.connect(url, function(err, db){
		if(err) throw err;
		db.collection('polls').update(
			{name : req.params.name, "options.name":req.params.option},
			{$inc: {"options.$.votes": 1}},
			(err, doc) => {
				if(err) throw err;
				db.collection('polls').findOne({name: req.params.name}, (e, d) => {
					if(e) throw e;
					res.end(JSON.stringify(d));
				})
			}
		)
	});
});

app.get('/api/delete/:name', (req, res) => {
	var name = req.params.name;
	mongo.connect(url, function(err, db){
		if(err) throw err;
		db.collection('polls').remove({name: name}, function(err, doc){
			if(err) throw err;
			res.end(JSON.stringify(doc))
		});
	});
});

// uncomment the below for development environment
// app.get('/*', function (req, res) {
//    res.sendFile(path.join(__dirname, './client/build', 'index.html'));
//  });

app.listen(3001);