serve_static.js

const http = require("http");
const path = require("path");
const fs = require("fs");
const busboy = require('connect-busboy');
const express = require("express");
const STORE_FOLDER = 'public';

const app = express();
app.use(busboy({
    highWaterMark : 2 * 1024 * 1024 // alot
}))
const httpServer = http.createServer(app);

const PORT = process.env.PORT || 3000;

httpServer.listen(PORT, () => {
  console.log(`Server is listening on port ${PORT}`);
});

app.use(express.static(STORE_FOLDER));

app.post('/upload', function (req, res) {
    req.pipe(req.busboy);

    req.busboy.on('file', (_, file, name) => {
        const fstream = fs.createWriteStream(`./${STORE_FOLDER}/${name}`);
        file.pipe(fstream);
    
        fstream.on('close', () => {
            res.send('Download complete')
        });
        fstream.on('error', () => {
            res.send('Download failed')
        });
    });
});