From Static files in the docs.

Serve a static directory. e.g. serve the public directory.

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

To serve on another path e.g. server contents of public as a /static.

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

Using an absolute path is safer:

const path = require('path')

app.use('/static', express.static(path.join(__dirname, 'public')))

A fuller example:

  • index.js
import express from "express";

const PORT = 3000

const app = express();

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

app.listen(PORT);

Or

app.listen(PORT, () => console.log(`Example app listening at http://localhost:${port}/`));