Add utils.toJson(obj) function to convert an object to a JSON string (#998)

* Add `utils.toJson(obj)` function to convert an object to a JSON string

* Add test for utils.toJson()

plexapi/utils.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 import base64
 import functools
+import json
 import logging
 import os
 import re
@@ -604,3 +605,17 @@ def iterXMLBFS(root, tag=None):
         if tag is None or node.tag == tag:
             yield node
         queue.extend(list(node))
+
+
+def toJson(obj, **kwargs):
+    """ Convert an object to a JSON string.
+
+        Parameters:
+            obj (object): The object to convert.
+            **kwargs (dict): Keyword arguments to pass to ``json.dumps()``.
+    """
+    def serialize(obj):
+        if isinstance(obj, datetime):
+            return obj.isoformat()
+        return {k: v for k, v in obj.__dict__.items() if not k.startswith('_')}
+    return json.dumps(obj, default=serialize, **kwargs)

tests/test_utils.py

@@ -91,3 +91,7 @@ def test_utils_download(plex, episode):
 def test_millisecondToHumanstr():
     res = utils.millisecondToHumanstr(1000)
     assert res == "00:00:01.0000"
+
+
+def test_toJson(movie):
+    assert utils.toJson(movie)