upload-with-busboy.ts

const busboy = Busboy({ headers: req.headers });

busboy.on<"file">("file", function (name, stream, info) {
  console.log("File [" + name + "]: filename: " + JSON.stringify(info));


  stream.on("data", function (data) {
    invariant(Buffer.isBuffer(data), "data is not a buffer");
    console.log(data);
    console.log(
      "File [" + name + "] got " + data.length + typeof data + " bytes"
    );
  });

  stream.on("end", function () {
    console.log("File [" + name + "] Finished");
  });
});

busboy.on<"field">("field", function (name, value) {
  console.log("Field [" + name + "]: value: " + value);
});

busboy.on("finish", function () {
  console.log("Done parsing form!");
  res.writeHead(303, { Connection: "close", Location: "/" });
  res.end();
});

req.pipe(busboy);