Question 1

What is a JavaScript keycode?

Accepted Answer

A keycode is a numeric code representing a physical key on the keyboard. The modern web uses event.key (the character produced) and event.code (the physical key location). This tool displays both values along with modifier keys like Shift, Ctrl, Alt, and Meta.

Question 2

What's the difference between event.key and event.code?

Accepted Answer

event.key shows the character produced by the key press (e.g., 'a' or 'A'), while event.code identifies the physical key location (e.g., 'KeyA'). This distinction is important for handling different keyboard layouts and games that need physical key positions.

Question 3

Why do some keys show 'undefined' or unexpected values?

Accepted Answer

Some special keys, multimedia keys, or keys unique to certain keyboards may not have standard JavaScript key values. Browser implementations also vary slightly. This tool shows the raw values provided by the browser's KeyboardEvent API.

Keycode Info

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