convert-upload-to-file.js

const fs = require('fs');
const crypto = require("crypto");

app.post('/upload', async (req, res) => {
  const randomId = crypto.randomBytes(16).toString("hex");
  const filePath = __dirname + "/uploads/" + randomId;
  const writeStream = fs.createWriteStream(filePath);
  writeStream.on('finish', () => {
      const { is_infected, viruses } = await scanFile(filePath);
      if (!is_infected) {
          // upload to AWS S3
      }
  })
  request.pipe(writeStream);
});