Ok, here the working code on 5.16.3 with output: 

            print Dumper $json_decoded;
            for my $key1 (keys $json_decoded)
            {
                # key1 = data
                print "key 1:  $key1 + $json_decoded->{$key1}\n";
                for my $key2 (keys $json_decoded->{$key1}) 
                {
                    # key2 = 0 .. x
                    print "key 2:  $key2 + $json_decoded->{$key1}[$key
+2]\n";
                    for my $key3 (keys $json_decoded->{$key1}[$key2]) 
                    {
                        # key3 = storageDeviceId,model,etc
                        print "key 3:  $key3 + $json_decoded->{$key1}[
+$key2]{$key3}\n";
                        $REST_storage{$key3} = $json_decoded->{$key1}[
+$key2]{$key3};
                    }
                }
            }

[download]

Output: 

$VAR1 = {
          'data' => [
                      {
                        'svpIp' => '10.1.1.1',
                        'model' => 'xyz',
                        'storageDeviceId' => '800000058068',
                        'serialNumber' => 58068
                      }
                    ]
        };
key 1:  data + ARRAY(0x2c79f78)
key 2:  0 + HASH(0x321a140)
key 3:  svpIp + 10.1.1.1
key 3:  model + xyz
key 3:  storageDeviceId + 800000058068
key 3:  serialNumber + 58068

[download]

Does this help?

In reply to Re^2: keys in reference experimental or reference is deprecated by demichi
in thread keys in reference experimental or reference is deprecated by demichi

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