Thanks 1nickt,

This looks like it will work - I've been able to figure out most from the docs (I really wish module creators would have real-life examples, but anyway).

Is there a way to do an array count validation?:

use strict; use warnings;

package JSONTypes {
    use parent 'Type::Library';
    use Type::Utils;
    use Types::Standard qw/ Dict Enum Str Tuple ArrayRef Optional Rege
+xpRef Int /;

    declare JSONType => as Dict[
        method => Enum[qw(xxx yyy)],
        backend => Dict[
            num => Int,
            other => Optional[Str],
            StrMatch[qr/^[a-z0-9]+$/]
        ],
       # following works, but how to check that the array has at least
+ (say) 2 elements  -  {2,}
        clientArr => ArrayRef[
            Dict[ num => Int, ],
        ]
    ];
};

package main {
    use JSON;

    JSONTypes->import(qw/ +JSONType /);

    my $data = from_json q|{
        "method": "xxx",
        "backend": {
            "num": 1,
            "client": "mytest009b"
        },
        "clientArr": [{ "num": "1" }, { "num": "2" }]
    }|;

    my $ret = eval { assert_JSONType( $data ); };
    if ($@) {
        print "ERROR\n$@\n";
    }
    else {
        print "OK\n";
    }

};
[download]

I'd appreciate any pointers.

Thanks

Edit: Figured out regex - use StrMatch[]
Edit 2: Validating array count can be done with an anon sub, but it then kills the other check:

        clientArr => ArrayRef[
            Dict[ num => Int, ],
        ],
        clientArr => sub {
            if (scalar @$_ < 2) {
                print "ERROR: clientArr too small\n";
                exit 1;
            }
            else {

           }
           return 1;
        }
[download]

So I guess the question is how to combine those two checks (without having to hand code the num=>Int checks in pure Perl of course).

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