The devas, who are the controllers of the affairs of the planets granted several boons to Lord Hanuman who was injured by Indra's weapon Vajra.
 

No missile can attack Hanuman.

To please Maruti's father Vayu, Indra granted a boon that he cannot be affected even by Indra’s thunderbolt and named him Hanuman.

Lord Rama promised Hanuman that as long as the story of Rama's life & adventures (the Ramayana) exists in the world, Hanuman's presence & influence will endure.
 

Sun God gave Hanuman two Yoga siddhis “laghima” and “garima”, i.e., to be able to attain the smallest or to attain the biggest form. 

Kamadeva granted a boon that the sex will not be effective on Hanuman & he would remain a pure Brahmachari that ensures his eternal life.
 

Kuvera granted him the boon that his mace would not cause Hanuman’s death in battles and that he would not become tired in battles.
 

Hanuman will not die because of Lord Shiva and His weapons.
 

Vishvakarma gave Hanuman a boon that He would not die with his weapons.