Keycode Identifier
Press any key and display its JavaScript keyCode and key name
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About Keycode Identifier
Identify JavaScript Keycodes by Pressing Any Key
If you have ever built a web application that responds to keyboard input - a game, a text editor, a shortcut system, an accessibility feature - you have dealt with keycodes. And if you have dealt with keycodes, you know how confusing they can be. Different browsers, different events (keydown vs. keypress vs. keyup), deprecated properties, and the shift from keyCode to key and code make keyboard event handling one of the most surprisingly tricky areas of front-end development. The Keycode Identifier clears up the confusion by showing you exactly what values JavaScript reports when you press any key.
How the Keycode Identifier Works
Simply press any key on your keyboard while the tool is active. It captures the keyboard event and displays all the relevant properties: event.key (the logical key value, like "Enter" or "a"), event.code (the physical key, like "KeyA" or "ArrowUp"), event.keyCode (the legacy numeric code), event.which (another legacy property), and modifier states (Shift, Ctrl, Alt, Meta). You see everything at a glance, for any key, on any keyboard layout.
Why Developers Need This Tool
The keyCode deprecation: The event.keyCode property that developers relied on for years is officially deprecated. Modern code should use event.key (which gives you the character or key name) or event.code (which identifies the physical key regardless of keyboard layout). But legacy code still uses keyCode everywhere, and you need to know the numeric values to maintain it. This tool shows both the modern and legacy values simultaneously.
Keyboard layout differences: On a QWERTY keyboard, the key in the top-left of the letter rows is Q. On AZERTY (French), it is A. On QWERTZ (German), Y and Z are swapped. The event.code property always returns the physical position ("KeyQ" for that top-left key), while event.key returns the character the layout assigns to it. Understanding this distinction is essential for building applications that work correctly across international keyboard layouts.
Special keys: What keyCode does the PrintScreen key return? How about the Windows key? The context menu key? Function keys F13 through F24? Media keys? These are not values you can memorize - you need to test them. The Keycode Identifier lets you press any key and see the result immediately.
Practical Use Cases
Building keyboard shortcuts: Productivity apps, code editors, and design tools rely on keyboard shortcuts. When implementing a shortcut system, you need to know the exact key and code values for every combination you plan to support. This tool is your reference during development.
Game development: Browser-based games use keyboard input for movement, actions, and menus. Getting the keycodes right - especially for combinations like Shift+Arrow or Ctrl+Space - is critical for responsive gameplay. Test your key mappings here before coding them.
Accessibility features: Screen readers and assistive technologies interact with keyboard events in specific ways. Understanding exactly which events fire and what values they produce helps you build accessible interfaces that respond correctly to keyboard navigation.
Debugging input issues: When a keyboard shortcut works on one machine but not another, the problem is often a keycode or layout mismatch. Having the user press the key on this tool and report the values gives you immediate diagnostic information.
The Three Key Properties Explained
event.key: Returns a string identifying the key value. For printable characters, it returns the character itself ("a", "A", "3", "!"). For special keys, it returns a descriptive name ("Enter", "Escape", "ArrowUp", "Shift"). This is the recommended property for most modern applications.
event.code: Returns a string identifying the physical key on the keyboard, regardless of layout or modifier state. Pressing the A key always returns "KeyA" whether or not Shift or CapsLock is active. This is ideal for games and applications where physical key position matters more than the character produced.
event.keyCode: Returns a numeric code. Deprecated but still widely used in legacy code. Values are not perfectly consistent across browsers, which is one reason the property was deprecated in favour of key and code.
Runs Entirely in Your Browser
The Keycode Identifier captures keyboard events locally using JavaScript event listeners. No keystrokes are recorded, transmitted, or stored. Your input stays completely private on your device.