my @rows =  $dbh->selectall_arrayref($sql, {Slice => {}});
my $cont = {data => \@rows};

$c->render(json => $cont);

##</code><code>##

{"data": [[
{
 "UNAME": "Name Goes Here",
 "AGE": "Age goes here",
 "TITLE": "Title goes here"
},
more results int he same format

]]}