How do you detect directional arrow keypresses in JavaScript? [duplicate]

I'm trying to detect keypresses on the left and right arrow keys. Here is my current code (nothing gets printed):

this.addEventListener('keypress', event => {
    if (event.key == "ArrowLeft") {
        console.log("Left key");
    } else if (event.key == "ArrowRight") {
        console.log("Right key");
    }
});

I've tried console.log(event.key) and pressing the directional arrow buttons as well, but again, nothing gets printed.

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