How to Use Keycode Info

The Keycode Info tool is designed to be simple and intuitive. Here's how to get started:

Step 1: Access the Tool

Navigate to the Keycode Info tool in your browser. The tool will automatically be ready to detect key presses.

Step 2: Press a Key

Simply press any key on your keyboard. The tool will immediately display:

• The key you pressed in large text
• Detailed information about the key
• A timestamp of when it was pressed

Step 3: View Key Information

The tool displays five key pieces of information:

Key

The actual character or key name (e.g., "a", "Enter", "Space")

Keycode

The numeric code for the key (e.g., 65 for "A", 13 for "Enter")

Code

The physical key identifier (e.g., "KeyA", "Enter", "Space")

Location

Where the key is located on the keyboard:

• 0: Standard location
• 1: Left side (e.g., left Shift)
• 2: Right side (e.g., right Shift)
• 3: Numpad

Modifiers

Any modifier keys held down:

• Ctrl
• Alt
• Shift
• Meta (Cmd on Mac, Windows key on Windows)

Step 4: Copy Information

Click the copy button next to any information to copy it to your clipboard. This is useful for:

• Debugging code
• Sharing key information
• Documentation purposes

Step 5: View History

The history section shows all previously pressed keys with:

• The key that was pressed
• Key information
• Timestamp
• Quick access to copy or remove entries

Keyboard Shortcuts

While using the tool, you can:

• Press any key: Display key information
• Click copy buttons: Copy specific information
• Click history items: Reload previous key information
• Click X on history items: Remove from history

Tips for Effective Use

For Web Developers

1. Test Event Handlers: Use the tool to verify your keyboard event listeners
2. Debug Key Codes: Check if your key codes match expected values
3. Cross-browser Testing: Compare key behavior across different browsers

For Accessibility Testing

1. Verify Navigation: Test keyboard navigation with screen readers
2. Check Shortcuts: Ensure keyboard shortcuts work as expected
3. Test Modifiers: Verify modifier key combinations

For Game Development

1. Map Controls: Understand key codes for game controls
2. Test Combinations: Verify multi-key combinations work
3. Platform Differences: Check key behavior across platforms

Common Use Cases

Debugging Keyboard Events

// Example: Debug a keydown event
document.addEventListener('keydown', (event) => {
  console.log('Key:', event.key);
  console.log('Code:', event.code);
  console.log('KeyCode:', event.keyCode);
  console.log('Location:', event.location);
});

Testing Key Combinations

Press multiple keys to test combinations:

• Ctrl + C (Copy)
• Alt + Tab (Switch applications)
• Shift + Arrow (Select text)

Understanding Key Locations

Test keys in different locations:

• Left Shift vs Right Shift
• Numpad numbers vs regular numbers
• Function keys (F1-F12)

Troubleshooting

Key Not Detected

If a key press isn't detected:

1. Check Focus: Ensure the browser tab is focused
2. Try Different Keys: Some keys may not be detectable
3. Refresh Page: Reload the tool if needed

Missing Information

If some information is missing:

1. Browser Compatibility: Check if your browser supports the KeyboardEvent API
2. Key Type: Some special keys may not have all properties
3. Modifier Keys: Modifier keys alone may show limited information

History Not Saving

If history isn't being saved:

1. Local Storage: Check if your browser allows local storage
2. Private Mode: Some browsers disable storage in private mode
3. Storage Limit: Clear old history if storage is full

Best Practices

1. Test Systematically: Try different types of keys systematically
2. Document Findings: Copy and save important key information
3. Cross-browser Test: Test in multiple browsers for consistency
4. Use History: Leverage the history feature for comparison
5. Clear Regularly: Clear history periodically to avoid clutter

The Keycode Info tool is a powerful debugging and educational resource. Use it to better understand keyboard events and improve your web applications!