File Upload Example in Node.js

Overview

This project is a Node.js application that demonstrates how to upload files using the built-in http module and the multiparty middleware. The application allows users to upload files to a designated directory on the server, providing a simple interface for file uploads.

Features

• Supports file uploads via a web form.
• Automatically creates a directory for uploaded files if it does not exist.
• Provides feedback to the user upon successful upload or error.

How File Upload Works

The application is structured as follows:

1. Server Setup: The application creates an HTTP server that listens for incoming requests on a specified port (3000).

2. Directory Management: Before handling uploads, the application checks for the existence of a directory named stream in the current working directory. If the directory does not exist, it is created using mkdirSync.

3. Handling Requests:

   • When a POST request is made to the root URL (/), the server uses the multiparty library to parse the incoming form data.
   • The part event is triggered for each file part in the form. A writable stream is created for each file, and the file data is piped into this stream.
   • Upon successful completion of the file write operation, the server responds with a success message, including the name of the uploaded file.
   • If an error occurs during the file upload, the server responds with an error message.

4. HTML Form: For GET requests to the root URL, the server responds with an HTML form that allows users to select a file for upload. The form uses multipart/form-data encoding to support file uploads.

Example Code Explanation

• File System Operations: The application uses fs to manage file system operations, ensuring that the upload directory exists.
• HTTP Server: The server is created using the http module, which handles incoming requests and sends appropriate responses.
• File Upload Handling: The multiparty library is used to parse the incoming form data, allowing for easy handling of