Question 1

What is a keycode in JavaScript?

Accepted Answer

A keycode is a numeric identifier for the physical key that was pressed. In modern JavaScript you should use event.code (the physical key, e.g. KeyA) and event.key (the logical character, e.g. 'a' or 'A') instead of the deprecated event.keyCode property.

Question 2

What is the difference between e.key and e.code?

Accepted Answer

event.key returns the character produced by the key, which changes with the keyboard layout and modifier keys (Shift, AltGr). event.code returns the physical key location on the keyboard and stays the same regardless of layout, making it ideal for game controls and shortcuts.

Question 3

Why is e.keyCode deprecated?

Accepted Answer

keyCode is deprecated because it is inconsistent across browsers and layouts and cannot distinguish some keys. This tool still shows it for legacy debugging, but new code should use event.key and event.code instead.

Question 4

Does this tool record or upload my keystrokes?

Accepted Answer

No. The key events are captured and displayed only in your browser. Nothing is recorded permanently or sent to any server. Clearing the log or leaving the page removes everything.