what is a public folder node js code example

Example 1: access to static file nodejs

app.use(express.static(__dirname + '/public'));
<link rel="stylesheet" type="text/css" href="css/style.css" />

Example 2: app.use public

app.use(express.static('public'))
app.use(express.static('files'))

Example 3: app.use public

express.static(root, [options])