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Re-reading JSON::XS there was one key word I missed the first time around. Here is the relevant POD with my emphasis added.

$perl_scalar = decode_json $json_text

The opposite of encode_json: expects an UTF-8 (binary) string and tries to parse that as an UTF-8 encoded JSON text, returning the resulting reference. Croaks on error.
So I need to encode before passing it to decode_json(). Here is the working program
#!/usr/bin/perl use v5.14; use warnings; use utf8::all; use Encode; use JSON::XS qw( decode_json ); my $wl = '{"creche": "crèche", "¥": "£", "₡": "волн" }'; my $pattern_list = decode_json( encode("utf8", $wl) );

In reply to Re^2: JSON::XS and unicode by kimmel
in thread JSON::XS and unicode by kimmel

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