node.js see files in folder instead of app

very new to nodejs, tried to build a very simple server on a linux server. for some reason when I go to the url I see the files in the folder. I am learning so I created a folder for each learning exercise.

This is my code: server.js

var express = require('express');
var bodyParser = require('body-parser');
var path = require('path');

var port = 3000;

var app = express();


app.use(function(req, res, next){
    console.log('Time: ', Date.now());
    next();
});

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));
app.use(express.static(path.join(__dirname, 'public')));

app.get('/', function(req, res){
    res.send('Hello World!');
});

app.get('/about', function(req, res){
    res.send('About Page');
});

app.listen(port);
console.log('Server started on ports '+port);

module.exports = app;

This is package.json

{
  "name": "myexpress",
  "version": "1.0.0",
  "description": "Simple express application",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "*",
    "body-parser":"*"
  }
}

I run node server in the folder project, I receive the Server running on ports3000 massage but in the browser i see this:

any help could be great,

via DavSev