saving files in nextjs on the public folder

save-file.ts

"use server";
import path from "path";
import fs from "fs";
import { uuid } from "uuidv4";

const UPLOAD_DIR = path.resolve(process.env.ROOT_PATH ?? "", "public/uploads");

export const SaveFileAction = async (data: FormData) => {
  const body = Object.fromEntries(data);
  const file = (body.file as Blob) || null;

  const fileExt = (body.file as File).name.split(".").pop();
  const uuidString = uuid();
  const newFileName = `${uuidString}.${fileExt}`;

  if (file) {
    const buffer = Buffer.from(await file.arrayBuffer());
    if (!fs.existsSync(UPLOAD_DIR)) {
      fs.mkdirSync(UPLOAD_DIR);
    }
    fs.writeFileSync(path.resolve(UPLOAD_DIR, newFileName), buffer);
  } else {
    return {
      status: false,
      file: null,
    };
  }

  return {
    status: true,
    file: newFileName,
  };
};