How to merge two json body in one?

Hello, I am looking for solution for merging json body. Let us suppose I have two json.

JSON1 : {"key1" : "val1"}, and JSON2 : {"key2" : "val2"}, my expected answer would be JSON_merged :  {"key1" : "val1", "key2" : "val2"}

How can I do?

Kinds Regards.