Does laughing invalidate the prayer?

The essential principle in prayer is that the servant performs it with humility, fully aware of being in the presence of their Lord. However, the effect of laughing during prayer due to uncontrollable reasons is evaluated in three ways:

a) Laughing out loud during prayer so that those nearby can hear: According to the Hanafis, both the ablution (wudu) and the prayer are invalidated by such laughter. (Serahsî, el-Mebsût, 1/77; Merğînânî, el-Hidâye, 1/18) In a hadith narrated by Ibn Usama from his father, it is stated: “While we were praying behind the Messenger of Allah, a blind man fell into a pit. We laughed at the man's situation. Upon this, the Messenger of Allah commanded us to perform ablution again and repeat the prayer from the beginning.” (Dârekutnî, es-Sünen, 1/295-296 [601]; Abû Dâwûd, Merâsîl, 75 [8]; Bayhaqî, es-Sünenü’l-kübrâ, 1/226 [679])

b) According to the Shafi'is, although loud laughter invalidates the prayer, it does not invalidate ablution. This is because laughing out loud outside of prayer does not break ablution, so it does not break it during prayer either. (Shirbînî, Muğni’l-muhtâc, 1/140)

c) If a person laughs during prayer in a way that only they themselves can hear, only the prayer is invalidated. Smiling in a way that neither the person themselves nor those nearby can hear does not invalidate either the prayer or the ablution. (Mawsilî, el-İhtiyâr, 1/11)

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu