ChatGPT-generated Fastify Node.js app for file uploads

chatgpt-generated-fastify-app-for-file-uploads.js

const fastify = require("fastify")();
const fs = require("fs");
const path = require("path");

// Set the directory where uploaded files will be saved
const UPLOADS_DIRECTORY = "uploads/";

// Create the uploads directory if it doesn't exist
if (!fs.existsSync(UPLOADS_DIRECTORY)) {
  fs.mkdirSync(UPLOADS_DIRECTORY);
}

// Define a route handler for file uploads
fastify.post("/api/uploads", async (request, reply) => {
  // Check if the request contains a file in the 'file' field
  if (!request.isMultipart() || !request.files.file) {
    return reply.status(400).send("No file uploaded.");
  }

  // Get the uploaded file object
  const uploadedFile = request.files.file;

  // Set the file path where the file will be saved
  const fileName = uploadedFile.name;
  const filePath = path.join(UPLOADS_DIRECTORY, fileName);

  // Save the file to disk
  const writeStream = fs.createWriteStream(filePath);
  writeStream.on("finish", () => {
    reply.send("File uploaded successfully!");
  });
  uploadedFile.pipe(writeStream);
});

// Start the server
fastify.listen(3000, (err) => {
  if (err) {
    console.error(err);
    process.exit(1);
  }
  console.log("Server listening on port 3000");
});