diff --git a/CHANGELOG.md b/CHANGELOG.md
index b114b79..9e4854a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - `fiboa create-geojson`: Show conversion progress
 - `fiboa jsonschema` and `fiboa validate`: Support `geometryTypes` for `geometry` data type in GeoJSON
 - `fiboa validate`:
-  - Basic validation for geometries and bounding boxes in GeoParquet files
+  - Basic validation for objects, geometries and bounding boxes in GeoParquet files
 
 ### Changed
 
diff --git a/fiboa_cli/types.py b/fiboa_cli/types.py
index dac0c89..12cc715 100644
--- a/fiboa_cli/types.py
+++ b/fiboa_cli/types.py
@@ -8,12 +8,26 @@
 def is_enum(schema):
     return isinstance(schema.get("enum"), list)
 
+def is_integer_type(dtype):
+    return dtype.startswith("int") or dtype.startswith("uint")
+
+def is_floating_type(dtype):
+    return dtype == "float" or dtype == "double"
+
+def is_numerical_type(dtype):
+    return is_integer_type(dtype) or is_floating_type(dtype)
+
+def is_temporal_type(dtype):
+    return dtype == "date" or dtype == "date-time"
+
+def is_scalar_type(dtype):
+    return dtype == "string" or dtype == "binary" or dtype == "boolean" or is_numerical_type(dtype) or is_temporal_type(dtype)
 
 def get_geopandas_dtype(type, required = False, schema = {}):
     """
     fiboa datatypes to geopandas datatypes
     """
-    if is_enum(schema) and (type == "string" or type.startswith("int") or type.startswith("uint")):
+    if is_enum(schema) and (type == "string" or is_integer_type(type)):
         return "category"
     elif type == "boolean":
         if required:
@@ -107,7 +121,7 @@ def get_pyarrow_type(schema):
     dtype = schema.get("type")
     if dtype == "boolean":
         return pa.bool_()
-    elif dtype.startswith("int") or dtype.startswith("uint") or dtype == "string" or dtype == "binary":
+    elif is_integer_type(dtype) or dtype == "string" or dtype == "binary":
         return getattr(pa, dtype)()
     elif dtype == "float":
         return pa.float32()
@@ -192,19 +206,19 @@ def get_pyarrow_type_for_geopandas(dtype):
 
 # checks pyarrow datatypes
 PYTHON_TYPES = {
-    "boolean": bool,
-    "int8": int,
-    "uint8": int,
-    "int16": int,
-    "uint16": int,
-    "int32": int,
-    "uint32": int,
-    "int64": int,
-    "uint64": int,
-    "float": float,
-    "double": float,
-    "binary": str,
-    "string": str,
+    "boolean": (bool, np.bool_),
+    "int8": (int, np.int8),
+    "uint8": (int, np.uint8),
+    "int16": (int, np.int16),
+    "uint16": (int, np.uint16),
+    "int32": (int, np.int32),
+    "uint32": (int, np.uint32),
+    "int64": (int, np.int64),
+    "uint64": (int, np.uint64),
+    "float": (float, np.float32),
+    "double": (float, np.float64),
+    "binary": (str, np.bytes_),
+    "string": (str, np.str_),
     "array": (list, np.ndarray),
     "object": dict,
     "date": (datetime.date, np.datetime64),
diff --git a/fiboa_cli/validate_data.py b/fiboa_cli/validate_data.py
index 12b8b07..23ef30a 100644
--- a/fiboa_cli/validate_data.py
+++ b/fiboa_cli/validate_data.py
@@ -2,10 +2,9 @@
 import pandas as pd
 
 from urllib.parse import urlparse
-from shapely.geometry.base import BaseGeometry
 from shapely.validation import explain_validity
 
-from .types import PYTHON_TYPES
+from .types import PYTHON_TYPES, is_numerical_type, is_scalar_type
 
 REGEX_EMAIL = re.compile("[^@]+@[^@]+\.[^@]+")
 REGEX_UUID = re.compile("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}\Z")
@@ -17,24 +16,24 @@ def validate_column(data, rules):
             # Skip validation for NaN values or implement special handling if required
             continue
 
-        dtype = rules.get('type')
-        python_type = PYTHON_TYPES.get(dtype)
-        if python_type is not None and not isinstance(value, python_type):
-            return [f"Value '{value}' is not of type {dtype}."]
+        dtype = rules.get("type")
+        expected_pytype = PYTHON_TYPES.get(dtype)
+        if expected_pytype is not None and not isinstance(value, expected_pytype):
+            actualy_pytype = type(value)
+            return [f"Value '{value}' is not of type {dtype}, is {actualy_pytype}"]
 
-        if isinstance(value, str):
+        if dtype == "string":
             issues = validate_string(value, rules)
-        elif isinstance(value, (int, float)):
+        elif is_numerical_type(dtype):
             issues = validate_numerical(value, rules)
-        elif isinstance(value, list):
+        elif dtype == "array":
             issues = validate_array(value, rules)
-        elif isinstance(value, BaseGeometry):
+        elif dtype == "geometry":
             issues = validate_geometry(value, rules)
-        elif isinstance(value, dict):
-            if dtype == 'bounding-box':
-                issues = validate_bbox(value, rules)
-            else:
-                issues = validate_object(value, rules)
+        elif dtype == "bounding-box":
+            issues = validate_bbox(value, rules)
+        elif dtype == "object":
+            issues = validate_object(value, rules)
         else:
             continue
 
@@ -103,24 +102,40 @@ def validate_numerical(value, rules):
         issues.append(f"Value {value} is greater than or equal to the exclusive maximum value of {rules['exclusiveMaximum']}.")
     if 'enum' in rules and value not in rules['enum']:
         allowed = ", ".join(map(str, rules['enum']))
-        issues.append(f"String '{value}' is not one of the allowed values in the enumeration: {allowed}")
+        issues.append(f"Integer '{value}' is not one of the allowed values in the enumeration: {allowed}")
     return issues
 
 # Array validation
 def validate_array(values, rules):
     issues = []
+
+    item_schema = rules.get('items', {})
+
     if 'minItems' in rules and len(values) < rules['minItems']:
         issues.append(f"Array has fewer items than the minimum of {rules['minItems']}.")
     if 'maxItems' in rules and len(values) > rules['maxItems']:
         issues.append(f"Array has more items than the maximum of {rules['maxItems']}.")
-    if 'uniqueItems' in rules and rules['uniqueItems'] and len(values) != len(set(values)):
-        issues.append("Array items are not unique.")
+
+    if 'uniqueItems' in rules and rules['uniqueItems']:
+        item_dtype = item_schema.get('type')
+        if is_scalar_type(item_dtype) and len(values) != len(set(values)):
+            issues.append("Array items are not unique.")
+        else:
+            pass # not supported for non-scalar types
+
+
     # todo: Further validation for 'items' if necessary
     return issues
 
 # Object validation
 def validate_object(value, rules):
     issues = []
+
+    if 'minProperties' in rules and len(value) < rules['minProperties']:
+        issues.append(f"Object has fewer properties than the minimum of {rules['minProperties']}.")
+    if 'maxProperties' in rules and len(value) > rules['maxProperties']:
+        issues.append(f"Object has more properties than the maximum of {rules['maxProperties']}.")
+
     props = rules.get('properties', {})
     other_props = rules.get('additionalProperties', False)
     pattern_props = rules.get('patternProperties', {})
@@ -128,4 +143,5 @@ def validate_object(value, rules):
         if key not in value:
             issues.append(f"Key '{key}' is missing from the object.")
         # todo: Further validation based on the type of property
+
     return issues