Not a general solution, of course, but Japanese is very easy to distinguish from other CJK languages. Pretty much any Japanese text will contain a significant amount of hiragana characters (syllabary), and no other languages use hiragana (except occasionally to spell Japanese words).

Likewise, modern Korean is almost exclusively written in Korean syllabary these days.

In reply to Re: How to Identify a language by TimToady
in thread How to Identify a language by moshkod

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