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Why my files in public folder gets 404

I have a file structure like this:

ng
    |---- controllers
    |         |----homeController.js
    |---- modules.js
node-modules
    |---- some modules here...
public
    |---- css
    |        |---main.css
    |---- js
    |        |---main.js
views
    |---- index.html.ejs
package.json
server.js

Here is my server.js

var express = require('express');
var morgan = require('morgan');
var ejs = require('ejs');

var app = express();

app.use(morgan('dev'));

app.use(express.static(__dirname + 'public'));
app.set('view-engine', ejs)

app.get('/', function(req, res) {
    res.render('index.html.ejs');
});

var server = app.listen(process.env.PORT || 3000, function() {
    console.log('server is listening on Port: %d', server.address().port);
});

Now, In my index.html.ejs file:

<!DOCTYPE html>
<html lang="en">

<head>
    <title>Mailer</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="css/main.css">
</head>

<body ng-app="addressBookApp">

    <h1>Sample Angular App </h1>

    <script src="js/main.js"></script>
    <script src="ng/modules.js"></script>
    <script src="ng/controllers/homeController.js"></script>    
</body>

</html>

How can I resolve ng folder so that I can reference my angular module and controllers?

Also, As if I run this server then I get error:

Why any files in public folder is not loaded? I get 404 for main.js and main.css

If you want to serve files in ng directory you should make it public too:

app.use(express.static(__dirname + '/ng'));

Now, you can load the files that are in the ng directory:

http://localhost:3000/ng/controllers/homeController.js

By the way it's better to create a folder called app and put everything inside ng in this directory.

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