my $perl = JSON::XS::decode_json $json;
print Dumper @$perl{'issues'};

##</code><code>##

$VAR1 = [
    {
  'fields' => {
      'customfield_22181' => 'Jira Testing',
      'customfield_11150' => {
         'value' => 'Yes',
         'self' => 'https://example.net/rest/api/2/customFieldOption/11347',
         'id' => '11347'
         },
      'status' => {
        'statusCategory' => {
          'colorName' => 'yellow',
          'name' => 'In Progress',
          'self' => 'https://example.net/rest/api/2/statuscategory/4',
          'id' => 4,
          'key' => 'indeterminate'
        },
        'name' => 'ProdStaged',
        'iconUrl' => 'https://example.net/images/icons/statuses/generic.png',
        'self' => 'https://example.net/rest/api/2/status/10034',
        'id' => '10034',
        'description' => ''
        },
      'customfield_22380' => '2016-02-20',
      'customfield_11179' => '2015-12-11',
      'customfield_11780' => [
         {
          'value' => 'Sunday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12841',
           'id' => '12841'
         },
         {
           'value' => 'Monday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12842',
           'id' => '12842'
         },
         {
           'value' => 'Tuesday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12843',
           'id' => '12843'
         },
         {
           'value' => 'Wednesday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12844',
           'id' => '12844'
         },
         {
           'value' => 'Thursday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12845',
           'id' => '12845'
         },
         {
           'value' => 'Friday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12846',
           'id' => '12846'
         },
         {
           'value' => 'Saturday',
           'self' => 'https://example.net/rest/api/2/customFieldOption/12847',
           'id' => '12847'
         }
         ],
      'issuetype' => {
       'name' => 'Auto Testing',
       'iconUrl' => 'https://example.net/secure/viewavatar?size=xsmall&avatarId=26414&avatarType=issuetype',
       'self' => 'https://example.net/rest/api/2/issuetype/10100',
       'id' => '10100',
       'subtask' => bless( do{\(my $o = 0)}, 'JSON::PP::Boolean' ),
       'description' => '',
       'avatarId' => 26414
         },
      'summary' => ' JIRA testing Summary',
      'updated' => '2016-01-06T14:15:14.000-0500'
    },
  'expand' => 'operations,versionedRepresentations,editmeta,changelog,transitions,renderedFields',
  'self' => 'https://example.net/rest/api/2/issue/569825',
  'id' => '569825',
  'key' => 'TEST-10756'
    }
    ];

##</code><code>##

customfield_22181 as 'Jira Testing'
customfield_11150{'value'} as 'Yes' 
status-{'name'} as 'ProdStaged'
customfield_11780{'value'} as "'Sunday', 'Monday',...,'Saturday'"u
key as 'TEST-10756'
+ other customfields