Differentiate JSON object vs JSON array in postgres

Let’s say I have a JSON file that is used to represent a class, however, as you see below, member could be a JSON object when there’s only 1 element, but can also be a JSON array when there’s more than one element.

{
   "classes":{
      "class":[
         {
            "name":"A",
            "base":{
               "name":"B"
            }
         },
         {
            "name":"C",
            "base":{
               "name":"B"
            },
            "member":{
               "name":"12B",
               "type":"1B9"
            }
         },
         {
            "name":"D",
            "member":[
               {
                  "name":"34B",
                  "type":"1B0"
               },
               {
                  "name":"6EA",
                  "type":"1B0"
               },
               {
                  "name":"3C38",
                  "type":"1B0"
               },
               {
                  "name":"4FBA",
                  "type":"1B0"
               },
               {
                  "name":"2F82",
                  "type":"bool"
               }
            ]
         }
      ]
   }
}

This is causing some problems when I am using when I am using json_array_elements on this JSON file, I was wondering if Postgres provide any function to check if it’s an array or object? test_class only has 1 column (info), which is the JSON data. My current solution is to write a python script to parse it, I was wondering if there’s any better solution?

SELECT x.name, x.type, class_name2.name AS class_name
FROM ICADS_JSON t, json_array_elements(t.info->'classes'->'class') as json_array
CROSS JOIN lateral json_array_elements(json_array->'member') as member
CROSS JOIN LATERAL json_to_record(member) as x(name text, type text) RIGHT JOIN
(SELECT class_name->>'name' AS name
FROM ICADS_JSON test_class, lateral json_array_elements(test_class.info->'classes'->'class') as class_name) as class_name2 ON
class_name2.name = json_array->>'name'

returns
ERROR: cannot call json_array_elements on a non-array