serve static file root in express js code example

Example 1: express public

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

Example 2: express img folder

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

Example 3: app.use public

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

Example 4: how to use static file node js

app.use('/static', express.static('public'))