How to respond to ありがとう?


I get it that ありがとう means "thanks", is informal without the ございます added to it
and so on.  
However, I do not know what I should say after someone thanked me. In English,
you generally say something like "No problem" or "You're welcome", it is
similar in German as well.  
But what do you say in Japanese?




`いえいえ` is an informal way to respond to `ありがとう`; similar to saying "No
problem" or "Don't mention it."

`どういたしまして` means "You're welcome" and is more polite/formal.




`いえいえ` is an informal way to respond to `ありがとう`; similar to saying "No
problem" or "Don't mention it."

`どういたしまして` means "You're welcome" and is more polite/formal.

