edited

var http = require("http");
var express = require("express");
var app = express();
app.use(express.static("stats"));
app.use(function(req,res,next){
	res.header('Access-Control-Allow-Origin',"*");
	res.header('Access-Control-Allow-Methods','GET,PUT,POST,DELETE');
	res.header('Access-Control-Allow-Headers','Content-Type');
	next();
})
var fs = require("fs");
var id=-1;
var bodyParser = require('body-parser');
var urlencodedParser = bodyParser.urlencoded({ extended: false })


app.get('/', function (req, res) {
  res.sendFile( __dirname + "/" + "Home.html" );

})
app.get('/signUp', function (req, res) {
	//console.log("here");
  res.sendFile( __dirname + "/" + "signUp.html" );
})
/** response for sign up submit button **/
app.post('/list_Users', urlencodedParser, function (req, res) {
// Prepare output in JSON format
  username = req.body.user;
  password = req.body.password;
  email= req.body.email;


fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
    data = JSON.parse( data );
	var flag=0;
	for (var i=0;i<data["id"].count;i++){
		if (email==data["users"][i].email){
			flag=1;
			break;
		}
	}
	if (flag==0){
	data['users'].push({"name":username,"password":password,"email":email,"id":data['id'].count, "data":""});
	id=data['id'].count;
	data['id'].count++;
	}
	else{
		// send error that email is already taken
	}
	fs.writeFile(__dirname + "/" + "employes.json",JSON.stringify(data), function (err) {
        if (err) return console.log("Error in opening employes json file");
        //console.log(JSON.stringify(data));
      });
	res.sendFile( __dirname + "/" + "project.html" );
	//res.end();


  });

 })
 app.get('/onload', urlencodedParser, function (req, res) {
 // Prepare output in JSON format


fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
	var data = JSON.parse(data);
	var obj = data['users'][id].data;

	var list= {task:JSON.parse(obj)};
	console.log(list);
	res.end(JSON.stringify(list));

});

 })
 app.post('/tryjson', urlencodedParser, function (req, res) {
 // Prepare output in JSON format
		   var obj=req.body.array;
fs.readFile( __dirname + "/" + "employes.json", 'utf8', function (err, data) {
	data = JSON.parse(data);
	data['users'][id].data=obj;
	fs.writeFile(__dirname + "/" + "employes.json",JSON.stringify(data), function (err) {
        if (err) return console.log("Error in opening employes json file");
        //console.log(JSON.stringify(data));
      });
});
   res.end();
 })
var server = app.listen(8081, function () {
   var host = server.address().address
   var port = server.address().port
   console.log("Example app listening at http://%s:%s", host, port)
 })