If you're going to be using a simple do() then you need to pass a reference to Dumper() as passing a bare hash results in a list of values being dumped which is not what you want e.g

use Data::Dumper;

my %hash = ( 'dataParams', {
               'license_feature' => { 'val' => 'geditor' }
             } );


open  DATA, ">whatever.dat";
print DATA Dumper(%hash);
close DATA;

print "bare hash dump\n", Dumper(do "whatever.dat");

open  DATA, ">whatever.dat";
print DATA Dumper(\%hash);
close DATA;

print "reference dump\n", Dumper(do "whatever.dat");

__output__

bare hash dump
$VAR1 = {
          'license_feature' => {
                                 'val' => 'geditor'
                               }
        };
reference dump
$VAR1 = {
          'dataParams' => {
                            'license_feature' => {
                                                   'val' => 'geditor'
                                                 }
                          }
        };
[download]

So as you can see when you dump by reference you get back the complete data structure.
HTH

_________
broquaint