A fastify app for handling multipart form data

FastifyApp.ts

import fastify,{ FastifyInstance }  from "fastify";
import cors from "fastify-cors";
import multipart from "fastify-multipart";
import { FastifyInstance } from "fastify";
import cloudinary from "cloudinary";
import { Server, IncomingMessage, ServerResponse } from "http";

const server: FastifyInstance<
  Server,
  IncomingMessage,
  ServerResponse
> = fastify();

server.register(cors);

server.register(multipart, {
  addToBody: true,
  sharedSchemaId: "MultipartFileType",
});

cloudinary.config({
  cloud_name: "YOUR_CLOUDNAME",
  api_key: YOUR_CLOUDINARY_API_KEY,
  api_secret: YOUR_CLOUDINARY_API_SECRET,
});
    
server.route({
  method: "POST",
  url: "/image",
  handler: async (request, reply) => {
    if (!request.isMultipart()) {
      reply.code(400).send(new Error("Request is not multipart"));
      return;
    }

    try {
      const image = await new Promise((resolve, reject) => {
        cloudinary.v2.uploader
          .upload_stream(
            { folder: 'images' },
            (error, result) => {
              if (error) {
                reject(error);
              }

              resolve(result);
            },
          )
          .end(request.body.file[0].data);
      });

      reply.code(200).send({ image });
    } catch (err) {
      reply.code(500).send(err.message);
    }
  },
});
    
    
server.setErrorHandler((error, _request, reply) => {
  console.error(error);
  reply.code(error.statusCode || 500).send(error);
});

server.listen(3000, (err, address) => {
  if (err) throw err;
  console.log(`server started on ${address}`);
});