As the mistake was done via the god Indra, he grants Hanuman a desire that his entire body will be as sturdy as Indra's Vajra, and that his Vajra may also not hurt him. In addition to Indra other gods have also granted him wishes: the God Agni granted Hanuman https://directory-2020.com/listings837919/helping-the-others-realize-the-advantages-of-hanuman