LAN File Transfer

A lightweight web-based file transfer tool for sharing files and folders between devices on the same local network.

Features

• File Upload - Upload single or multiple files via button or drag-and-drop
• Folder Upload - Upload entire folders while preserving directory structure
• Directory Browsing - Navigate into folders, browse contents, download individual files
• Breadcrumb Navigation - Quickly jump back to any parent directory
• Upload Progress - Real-time progress bar during uploads
• File Management - Download and delete files; delete entire folders
• QR Code - Scan to quickly access from a mobile device
• Custom Directory - Specify a custom storage directory via command line
• Responsive UI - Works on desktop and mobile browsers

Prerequisites

• Node.js v14 or later

Installation

cd lan-transfer
npm install

Usage

Start with default storage directory (./uploads)

node server.js

Start with a custom storage directory

node server.js /path/to/your/directory

Example

node server.js ~/shared-files

On startup, the server prints the access URLs:

========================================
  LAN File Transfer Server
========================================
  Local:   http://localhost:3000
  LAN:     http://192.168.1.100:3000
  Dir:     /home/user/shared-files
========================================

Open the LAN address on any device connected to the same network to start transferring files.

How It Works

1. Start the server on one computer.
2. Open the displayed LAN URL in a browser on any device in the same network.
3. Upload: Click "Select Files" / "Select Folder", or drag and drop files/folders onto the page.
4. Browse: Click a folder name to open it. Use the breadcrumb trail to navigate back.
5. Download: Click the "Download" button next to any file.
6. Delete: Click the "Delete" button to remove a file or folder.

API Endpoints

Method	Endpoint	Description
GET	/api/files?dir=<path>	List files and folders in a directory
POST	/api/upload?dir=<path>	Upload files (multipart form: files[] + paths[])
GET	/api/download/<path>	Download a file
DELETE	/api/files/<path>	Delete a file or folder
POST	/api/mkdir	Create a new directory (JSON body: {dir, name})
GET	/api/qrcode	Get server URL and QR code data URI

Configuration

Option	Default	Description
Port	3000	Hardcoded in server.js (edit PORT to change)
Max file size	5 GB	Per-file upload limit
Storage directory	./uploads	Override via command line argument

License

MIT