Update: Perlmonks seems to have trouble rendering some of this. The question is also at stackoverflow.

I'm getting some corrupted JSON and I've reduced it down to this test case. 

    use utf8;
    use 5.18.0;
    use Test::More;
    use Test::utf8;
    use JSON::XS;

    BEGIN {
        # damn it
        my $builder = Test::Builder->new;
        foreach (qw/output failure_output todo_output/) {
            binmode $builder->$_, ':encoding(UTF-8)';
        }
    }

    foreach my $string ( 'Deliver «French Bread»', '日本&#
+22269;' ) {
        my $hashref = { value => $string };
        is_sane_utf8 $string, "String: $string";
        my $json = encode_json($hashref);
        is_sane_utf8 $json, "JSON: $json";
        say STDERR $json;
    }
    diag ord('»');

    done_testing;

[download]

And this is the output:

    utf8.t .. 
    ok 1 - String: Deliver «French Bread»
    not ok 2 - JSON: {"value":"Deliver «French Bread»"}

    #   Failed test 'JSON: {"value":"Deliver «French Bread»"}'
    #   at utf8.t line 17.
    # Found dodgy chars "<c2><ab>" at char 18
    # String not flagged as utf8...was it meant to be?
    # Probably originally a LEFT-POINTING DOUBLE ANGLE QUOTATION MARK 
+char - codepoint 171 (dec), ab (hex)
    {"value":"Deliver «French Bread»"}    
    ok 3 - String: &#26085;&#26412;&#22269;
    ok 4 - JSON: {"value":"æ&#151;¥æ&#156;¬å&#155;½"}
    1..4
    {"value":"&#26085;&#26412;&#22269;"}
    # 187

[download]

So the string containing guillemets («») is valid UTF-8, but the resulting JSON is not. What am I missing? The `utf8` pragma is correctly marking my source. Further, that trailing 187 is from the diag. That's less than 255, so it almost looks like a variant of the old Unicode bug in Perl. (And the test output still looks like crap. Never could quite get that right with Test::Builder).

Switching to `JSON::PP` produces the same output.

Further testing reveals the failure for all characters in range 127 to 255.

This is Perl 5.18.1 running on OS X Yosemite.

Cheers,
Ovid

Live and work anywhere in the world.

In reply to JSON::XS (and JSON::PP) appear to generate invalid UTF-8 for character in range 127 to 255 by Ovid

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