How do you say i had a blast in french?

There are a few ways to say "I had a blast" in French, depending on the context and the level of formality you want to convey:

Informal:

* J'ai passé un super moment! (I had a great time!)

* J'ai bien rigolé! (I had a good laugh!)

* C'était génial! (It was awesome!)

* J'ai kiffé! (This is very informal, meaning something like "I loved it!")

Formal:

* J'ai passé un agréable moment. (I had a pleasant time.)

* J'ai beaucoup apprécié. (I enjoyed it very much.)

You can also use other expressions depending on the specific situation:

* J'ai adoré la soirée. (I loved the party.)

* C'était vraiment cool! (That was really cool!)

* J'ai bien aimé le concert. (I liked the concert.)

The best way to choose the right expression is to consider your audience and the context of the conversation.