Next.js file uploader with busboy

image-upload.ts

import { NextApiRequest, NextApiResponse } from 'next';
import Busboy from 'busboy';
import { inspect } from 'util';

export const config = {
  api: {
    bodyParser: false,
  },
};

async function r(req: NextApiRequest) {
  return new Promise((resolve) => {
    const busboy = new Busboy({ headers: req.headers });
    console.log(JSON.stringify(req.headers, null, 2));
    busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
      console.log(
        'File [' + fieldname + ']: filename: ' + filename + ', encoding: ' + encoding + ', mimetype: ' + mimetype,
      );
      file.on('data', function (data) {
        console.log('File [' + fieldname + '] got ' + data.length + ' bytes');
      });
      file.on('end', function () {
        console.log('File [' + fieldname + '] Finished');
      });
    });
    busboy.on('field', function (fieldname, val) {
      console.log('Field [' + fieldname + ']: value: ' + inspect(val));
    });
    busboy.on('finish', function () {
      console.log('Done parsing form!');

      resolve(1);
    });
    req.pipe(busboy);
  });
}

export default async function imageUploadHandler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method !== 'POST') {
    return res.status(405).end();
  }

  await r(req);

  res.status(200).end(JSON.stringify({ ok: true }));
}