Any idioms about feeling happy for someone?
Hello. I'm writing a letter to my friend and in this letter I would like to say about how happy I am for her (there was actually a good reason for this). However I realised that I coudn't find a proper idiom in English about expressing happiness for someone's success or achievements. In Russian I would say something like "I cannot even find proper words in order to express how happy I am for you". Is there some proper idiom in English for this case that might make me sound more native?

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Depends on how formal you want to be:
(1) Formal and florid: Words fail me as I attempt to express my immense pleasure to have learned about your X.
(2) Informal and friendly: I can't tell you how happy I am for you when I heard that XYZ
 Or I can't even begin to describe how happy I am for you ...

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before i was one of those

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Thanks a lot! I appreciate that.

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Here are some idioms for feeling happy ..

I was over the moon to hear about ...
I was tickled pink when I heard about ....
I was on cloud nine when I heard that you ....

hope that helps
regards
MK