diff --git a/snscrape/base.py b/snscrape/base.py
index f3cce0b..829bb69 100644
--- a/snscrape/base.py
+++ b/snscrape/base.py
@@ -36,11 +36,14 @@ def _json_serialise_datetime(obj):
 def _json_dataclass_to_dict(obj):
 	if isinstance(obj, _JSONDataclass) or dataclasses.is_dataclass(obj):
 		out = {}
+		out['_type'] = f'{type(obj).__module__}.{type(obj).__name__}'
 		for field in dataclasses.fields(obj):
+			assert field.name != '_type'
 			out[field.name] = _json_dataclass_to_dict(getattr(obj, field.name))
 		# Add in (non-deprecated) properties
 		for k in dir(obj):
 			if isinstance(getattr(type(obj), k, None), property):
+				assert k != '_type'
 				out[k] = _json_dataclass_to_dict(getattr(obj, k))
 		return out
 	elif isinstance(obj, (tuple, list)):
diff --git a/snscrape/modules/twitter.py b/snscrape/modules/twitter.py
index 1955363..ca45be8 100644
--- a/snscrape/modules/twitter.py
+++ b/snscrape/modules/twitter.py
@@ -60,7 +60,6 @@ class Medium:
 class Photo(Medium):
 	previewUrl: str
 	fullUrl: str
-	type: str = 'photo'
 
 
 @dataclasses.dataclass
@@ -75,14 +74,12 @@ class Video(Medium):
 	thumbnailUrl: str
 	variants: typing.List[VideoVariant]
 	duration: float
-	type: str = 'video'
 
 
 @dataclasses.dataclass
 class Gif(Medium):
 	thumbnailUrl: str
 	variants: typing.List[VideoVariant]
-	type: str = 'gif'
 
 
 @dataclasses.dataclass