1 year old hitting- when to intervene

Okay, I’m a first time mom and my daughter just turned one. I need some help/ advice since I obviously never handled this before.

So my daughter will sometimes hit or slap my husband and I. It’s never out of anger or aggression. It’s just when she gets excited or happy. But at what point do I intervene that’s not okay to do? Like if I allow her to do it now while she’s happy she will think it’s okay when she’s mad? She is definitely understanding her emotions more and when she gets mad she clenches her fists and screams.

But how do I handle this? I try to hold her hands when she does it and very calmly shake my head/ say no but she just laughs because she’s just happy and isn’t doing it maliciously.

I’m just so afraid she’s going to be a hitter when she gets older