Fastify server for Bookworms slack integration

server.js

import Fastify from "fastify";
import fastifyForm from "fastify-formbody";
import { init } from "./bookworms.js";
import { sendBookMarks, sendBookmarkCommands} from "./slack.js";

const fastify = Fastify();
// fastifyForm is needed to get the body from a POST request
fastify.register(fastifyForm);

// creating a hook for Slack slash commands
fastify.post("/webhooks/slack/bookmarks", (request, reply) => {
  const { body } = request;
  // handle requesting requests when user doesn't specify a folder
  if (body?.text === "" || body?.text.toLowerCase() === "all") {
    reply.send(sendBookmarkCommands());
  } else {
    reply.send(sendBookMarks(body.text));
  }
});

fastify.listen(3000, async (err) => {
  // loading from file system the bookmarks
  await init();
  if (err) {
    fastify.log.error(err);
    process.exit(1);
  }
});