diff --git a/apps_ci/scripts/catalog_update.py b/apps_ci/scripts/catalog_update.py
index fd8662c..cb1c51d 100644
--- a/apps_ci/scripts/catalog_update.py
+++ b/apps_ci/scripts/catalog_update.py
@@ -50,7 +50,7 @@ def validate_train_data(train_data):
     except (json.JSONDecodeError, JsonValidationError) as e:
         verrors.add(
             'catalog_json',
-            f'Failed to validate contents of train data ({".".join(list(e.path))}): {e!r}'
+            f'Failed to validate contents of train data ({".".join([str(p) for p in e.path])}): {e!r}'
         )
     verrors.check()
 
diff --git a/apps_validation/json_schema_utils.py b/apps_validation/json_schema_utils.py
index 964222d..573f4eb 100644
--- a/apps_validation/json_schema_utils.py
+++ b/apps_validation/json_schema_utils.py
@@ -1,3 +1,22 @@
+APP_ITEM_JSON_SCHEMA = {
+    'type': 'object',
+    'properties': {
+        'categories': {
+            'type': 'array',
+            'items': {'type': 'string'},
+        },
+        'tags': {
+            'type': 'array',
+            'items': {'type': 'string'},
+        },
+        'screenshots': {
+            'type': 'array',
+            'items': {'type': 'string'},
+        },
+        'icon_url': {'type': 'string'},
+    },
+    'required': ['categories'],
+}
 APP_METADATA_JSON_SCHEMA = {
     'type': 'object',
     'properties': {
@@ -79,6 +98,14 @@
                 'required': ['description', 'host_path'],
             },
         },
+        'screenshots': {
+            'type': 'array',
+            'items': {'type': 'string'},
+        },
+        'categories': {
+            'type': 'array',
+            'items': {'type': 'string'},
+        },
     },
     'required': [
         'name', 'train', 'version', 'app_version', 'title', 'description', 'home',
diff --git a/apps_validation/validate_app.py b/apps_validation/validate_app.py
index e48b203..d94380a 100644
--- a/apps_validation/validate_app.py
+++ b/apps_validation/validate_app.py
@@ -2,11 +2,13 @@
 import json
 import yaml
 
+from jsonschema import validate as json_schema_validate, ValidationError as JsonValidationError
+
 from apps_ci.names import CACHED_VERSION_FILE_NAME
 from apps_exceptions import ValidationErrors
 
+from .json_schema_utils import APP_ITEM_JSON_SCHEMA
 from .validate_app_version import validate_catalog_item_version_data, validate_catalog_item_version
-from .utils import validate_key_value_types
 
 
 def validate_catalog_item(catalog_item_path: str, schema: str, train_name: str, validate_versions: bool = True):
@@ -37,12 +39,10 @@ def validate_catalog_item(catalog_item_path: str, schema: str, train_name: str,
         with open(os.path.join(catalog_item_path, 'item.yaml'), 'r') as f:
             item_config = yaml.safe_load(f.read())
 
-        # TODO: Remove validate key value type function and have json schemas for all of this
-        validate_key_value_types(
-            item_config, (
-                ('categories', list), ('tags', list, False), ('screenshots', list, False),
-            ), verrors, f'{schema}.item_config'
-        )
+        try:
+            json_schema_validate(item_config, APP_ITEM_JSON_SCHEMA)
+        except JsonValidationError as e:
+            verrors.add(f'{schema}.item_config', f'Invalid format specified for item configuration: {e}')
 
     cached_version_file_path = os.path.join(catalog_item_path, CACHED_VERSION_FILE_NAME)
     if os.path.exists(cached_version_file_path):