What information is shown when I press a key?

The tool displays event.key, event.code, event.which, and the numerical keyCode value, along with modifier key states (Shift, Ctrl, Alt, Meta).

Is there a reference for all keycodes?

Yes, there is a searchable cheat sheet table listing all standard JavaScript keycodes and their corresponding event values.

Press any key to instantly get its JavaScript event keycode, key name, code value, and modifier status.

Press any key to begin...