Hyperclay Local

A desktop app for running HTML apps locally.

🛠️

Build Without Limits

Self-contained HTML apps. No frameworks needed. Just HTML, CSS, and JavaScript.

💾

Your Apps, Your Computer

Everything runs locally. No cloud dependencies. Perfect for sensitive projects.

🍄

Zero Friction

One click starts your server. No build steps. Edit and refresh instantly.

🌍

Cross-Platform

Works on macOS, Windows, and Linux. Share apps with anyone.

Why Use Hyperclay Local?

While hyperclay.com provides the full hosted experience with user accounts, version history, and collaboration features, this local server lets you:

✅
Work offline - Edit your apps without internet connection
✅
Own your data - Complete independence from any platform
✅
No subscription needed - Run unlimited apps locally for free
✅
Privacy first - Your apps and data never leave your computer
✅
Future-proof - Apps work forever, regardless of service status

Quick Start

For Users (Download Pre-built App)

Download the app for your platform:
- macOS: Hyperclay-Local-1.0.0.dmg
- Windows: Hyperclay-Local-Setup-1.0.0.exe
- Linux: Hyperclay-Local-1.0.0.AppImage
Install and run the app
Select your folder containing HTML apps
Click "Start Server"
Browser opens automatically to your apps!

For Developers (Build from Source)

📦 GitHub Repository

# Install dependencies
npm install

# Run in development mode
npm run dev

# Build for all platforms
npm run build-all

# Build for specific platform
npm run build-mac     # macOS
npm run build-windows # Windows  
npm run build-linux   # Linux

How It Works

Server Integration

The app runs an embedded Express.js server (same as the Node.js version) with:

Static file serving with extensionless HTML support
POST /save/:name endpoint for app self-saving
Beautiful directory listings
Security protections (path traversal, filename validation)

User Interface

Main Window

Header with app name and server status indicator
Visual folder picker with current selection display
Start/stop buttons and browser launcher
Server URL and folder path when running
Step-by-step usage guide
Links to Hyperclay.com and documentation

System Tray

Status indicator: Green (running) / Red (stopped)
Quick actions: Start/stop server, show/hide window
Background operation: App continues running when window closed

Keyboard Shortcuts

Cmd/Ctrl + O Select folder
Cmd/Ctrl + R Start server
Cmd/Ctrl + S Stop server
Cmd/Ctrl + W Close window (app stays in tray)
Cmd/Ctrl + Q Quit app (macOS only)

Security Features

Sandboxed renderer: Web content runs in isolated context
IPC security: Secure communication between main and renderer processes
Path validation: Prevents access to files outside selected folder
Filename sanitization: Only allows safe characters in saved files
Content validation: Validates file content before saving

Troubleshooting

Installation Issues

macOS "App is damaged" error

xattr -cr "/Applications/Hyperclay Local.app"

Windows SmartScreen warning

Click "More info" → "Run anyway" (This happens because the app isn't code-signed)

Linux permission denied

chmod +x Hyperclay-Local-1.0.0.AppImage

Runtime Issues

Port 4321 already in use

The app will show an error dialog
Kill any existing process using the port
Or wait for the existing process to terminate

Server won't start

Check the folder contains some files
Ensure folder path doesn't contain special characters
Try selecting the folder again

Links & Resources

Made with ❤️ for Hyperclay - The platform for malleable HTML applications