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...
use JSON;
...

# or if using Mojolicious
$c->render(json => $ret_data);

my $ret_data = {
  'status' => -1, # file was too big and I truncated it
...
  'message-html' => "<b>success blah blah for $fileame but truncated</
+b>",
  'data' => truncate($data)
};