Learn six of the most useful and common idioms expressing happiness in English

Expressing Joy: 6 English Idioms to Share Your Happiness

to be extremely happy.
"Oh, I just got promoted, and I’m on cloud nine."

a person who is completely satisfied with his life or with a certain situation in life. Everything is fine with him, he never complains. "My friend just got a new job and also bought a new car. He is such a happy camper"

to be extremely happy and blissful. It is often used to describe someone who is feeling very good about something.
 "I was in seventh heaven when I married the love of my life."

to be very pleased or delighted with something. It is often used to describe someone who is feeling satisfied and happy.
"I was tickled pink when I got a perfect score on my test."

to be very happy and content. It is often used to describe someone who is peaceful and relaxed.
"She was as happy as a clam sitting on the beach."

to be feeling very happy and successful. It is often used to describe someone who is feeling confident and proud of themselves.
"I felt on top of the world after I finally finished my marathon.