how to know which key was pressed javascript keypress event code example

Example 1: keypress javascript

The keypress event has been deprecated, 
you should look to use beforeinput : https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/beforeinput_event
or keydown : https://developer.mozilla.org/en-US/docs/Web/API/Document/keydown_event
instead.

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Example 2: how to detect a keypress in javascript

window.addEventListener("keydown", (event) => {
	console.log(event.key);
});