binmode STDOUT, ":utf8";
But is your terminal in UTF-8 mode? Try running perl yourscript.pl > utf8.txt and opening utf8.txt as UTF-8 text file. If you need to output Unicode characters to terminal, try Encode::Locale and binmode STDOUT, ":encoding(console_out)" (assuming that your terminal uses encoding which does have these Unicode characters; on Windows you may want to run chcp 65001 first).

In reply to Re^3: malformed UTF-8 character in JSON string in perl by aitap
in thread malformed UTF-8 character in JSON string in perl by Yllar

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