app.js

var express = require('express');
var bodyParser = require('body-parser');
var path = require('path');
var app = express();
var expressValidator = require('express-validator');
var mongojs = require('mongojs');
var db = mongojs('customerapp',['users']);
var ObjectId = mongojs.ObjectId;

//Body Parser Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:false}));

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

//set Global vars
app.use(function(req,res,next){
	res.locals.errors = null;
	next();
});

app.use(expressValidator({
	errorFormatter: function(param,msg,value){
		var namespace = param.split('.'),
		root = namespace.shift(),
		formParam;

		while(namespace.length){
			formParam += '[' + namespace.shift() + ']';
		}
		return {
			param : formParam,
			msg : msg,
			value : value
		};
	}
}));

app.set('view engine','ejs');
app.set('views',path.join(__dirname,'views'));

app.get('/',function(req,res){	
	// find in mongo everything
	db.users.find(function (err, docs) {
			res.render('index',{
			title:'Customers',
			users:docs
		});
	})
});

app.post('/users/add',function(req,res){

	req.checkBody('first_name','First Name is required').notEmpty();
	req.checkBody('last_name','Last Name is required').notEmpty();
	req.checkBody('age','Age is required').notEmpty();

	var errors = req.validationErrors();

	if(errors){
		res.render('index',{
				title:'Customers',
				users:users,
				errors:errors
			});
	}else{
		var newUser = {
			first_name : req.body.first_name,
			last_name : req.body.last_name,
			age : req.body.age
		}
		db.users.insert(newUser, function(err,result){
			if(err){
				console.log(err);
			}
			res.redirect('/');
		});
	}
});

app.delete('/users/delete/:id',function(req,res){
	db.users.remove({_id:ObjectId(req.params.id)},function(err){
		if(err){
			console.log(err);
		}
		res.redirect('/');
	})
});

app.listen(3000,function(){
	console.log('Server started on port 3000...');
})