Answered by Shaykh Faraz Rabbani
does laughing invalidate wudhu?
Walaikum assalam wa rahmatullah,
If one laughs in the prayer such that others could have heard your laughter, it invalidates both wudu and prayer.
If you laugh such that only you could hear it, then it does not invalidate your wudu but does invalidate your prayer. [Maraqi al-Falah, Durr al-Mukhtar Sharh Tanwir al-Absar]
Wassalam,
Faraz Rabbani