fix: serialize array-valued GeoJSON properties as JSON

CHANGELOG.rst

@@ -5,6 +5,7 @@ Unreleased
 -  feat: :doc:`/scripts/csvclean` adds a :code:`--remove-empty-columns` option to remove empty columns from standard output.
 -  feat: :doc:`/scripts/in2csv` guesses the ``ndjson`` format for files with :code:`.ndjson`, :code:`.jsonl` and :code:`.jl` extensions.
 -  fix: :code:`-C/--not-columns` now excludes the last column of an open-ended range (e.g. :code:`2-`).
+-  fix: :doc:`/scripts/in2csv` with :code:`--format geojson` serializes array-valued properties as JSON, like object-valued properties, instead of as a Python ``repr``.
 
 2.2.0 - December 15, 2025
 -------------------------

csvkit/convert/geojs.py

@@ -64,7 +64,7 @@ def geojson2csv(f, key=None, **kwargs):
 
         for field in property_fields:
             value = properties.get(field)
-            if isinstance(value, OrderedDict):
+            if isinstance(value, (OrderedDict, list)):
                 value = json.dumps(value)
             row.append(value)
 

tests/test_utilities/test_in2csv.py

@@ -229,6 +229,19 @@ def test_geojson_no_inference(self):
 
         input_file.close()
 
+    def test_geojson_array_property(self):
+        input_file = io.BytesIO(
+            b'{"type": "FeatureCollection", "features": [{"geometry": null, "properties": '
+            b'{"tags": ["a", "b"], "obj": {"k": "v"}}}]}')
+
+        with stdin_as_string(input_file):
+            self.assertLines(['-f', 'geojson'], [
+                'id,tags,obj,geojson,type,longitude,latitude',
+                ',"[""a"", ""b""]","{""k"": ""v""}",null,,,',
+            ])
+
+        input_file.close()
+
     def test_json_no_inference(self):
         input_file = io.BytesIO(b'[{"a": 1, "b": 2, "c": 3}]')