here is my code
var express = require('express'),
http = require('http'),
path = require('path'),
hash = require('./pass').hash;
var moment = require('moment');
var bcrypt = require('bcrypt');
var app = express();
var methodOverride = require('method-override');
var mysql = require('mysql');
connection.connect(function(err){
if(!err) {
console.log("Database is connected ... nn");
} else {
console.log("Error connecting database ... nn");
}
});
/*
Middlewares and configurations
/
app.configure(function () {
app.use(express.bodyParser());
app.use(express.cookieParser('Authentication Tutorial '));
app.use(express.session());
app.use(methodOverride(function(req, res){
if (req.body && typeof req.body == 'object' && 'method' in req.body)
{
var method = req.body.method;
delete req.body.method;
return method;
}
}));
app.use(express.static(path.join(dirname, 'public')));
app.set('views', _dirname + '/views');
app.set('view engine', 'ejs');
});
var connection = mysql.createConnection({
host : 'hostss',
user : 'user',
password : 'password',
database : 'db'
});
app.use(function (req, res, next) {
var err = req.session.error,
msg = req.session.success;
delete req.session.error;
delete req.session.success;
res.locals.message = '';
if (err) res.locals.message = '<p class="msg error">' + err + '</p>';
if (msg) res.locals.message = '<p class="msg success">' + msg + '</p>';
next();
});
/*
Helper Functions
*/

function user_exits(req, res, next) {
var username= req.body.username;
connection.query("SELECT * FROM user WHERE username =?",[username],function (error, results, fields) {
if (error) {
console.log(error);
res.send("fail internal error"+"\r\n");
}
if (results.length >0) {
console.log('User is Already Exists');
res.send("fail user already exists"+"\r\n");

} else {

    console.log('No user Available oN that name, U can insert it');
    next();

}

});
}

/*
Routes
*/
app.get("/", function (req, res) {

    res.render("index", { moment: moment });

});

app.get("/signup", function (req, res) {
res.render("signup",{ moment: moment });

});

app.post("/signup",user_exits,function (req, res){
bcrypt.hash(req.body.password, 5, function( err, bcryptedPassword) {

var users={
"username":req.body.username,
"email":req.body.email,
"password":bcryptedPassword,

}
console.log(users);
connection.query('INSERT INTO user SET ?',users, function (error, results, fields) {
if (error) {
console.log("error ocurred",error);
res.send({
"code":400,
"failed":"error ocurred"
});
}else{
console.log('The solution is: ', results);
res.send({
"code":200,
"success":"user registered sucessfully"
});
}
});
});

});

app.get("/login", function (req, res) {
res.render("login",{ moment: moment });
});

app.post("/login",function (req, res) {
var sess = req.session;
var username= req.body.username;
var password = req.body.password;
connection.query('SELECT * FROM user WHERE username = ?',[username], function (error, results, fields) {
if (error) {
console.log(error);
}else{
if(results.length >0){
bcrypt.compare(password, results[0].password, function(err, doesMatch){
if (doesMatch){
req.session.userId = results[0].id;
req.session.user = results[0];
console.log(results[0].id);
res.redirect('/profile/'+results[0].id);
}else{
res.send({
"code":204,
"success":"Email and password does not match"
});
}
});
}
else{
console.log("fine");
}
}
});
});
but when i upload it on digitalocean server the form is not working?? please developer help me to fix that problem...