I want to use any keystroke on the keyboard only as a trigger.

Question

JS code. After pressing any key on the keyboard i want to do something, for example: document.write("Hello!").
I don't want to print this key, he serves only as a trigger of action.
I've tried with:

html:
<input id="mess">
JS:
let box = document.getElementById('mess');
box.addEventListener('keydown', (event) => {document.write("Hello!")});

but at the begining it opens text box on the page & prints out pressed key in this box.
Any idea, please.

Answer 1

It works!
Could you please share me the code please