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Question
we have Japanese beetles really bad in the house and they keep getting in our bearded dragons area, and I saw him eat one. will he be ok? I'm not sure if it will hurt him or not.

Answer
 He probably won't eat another because supposedly they taste nasty.  One should not be a problem.  I would try and cover the habitat with hardware cloth and keep the beetles out simply because of the beetles' probable contact with fertilizers, pesticides and herbicides which could hurt your beardie from eating too many if hey don't mind the nasty taste.  The insect deadly to reptiles is the firefly or lightning bug.  One could kill a beardie very fast.