diff --git a/api/funkwhale_api/common/serializers.py b/api/funkwhale_api/common/serializers.py
index 8504fc587..d623b2cae 100644
--- a/api/funkwhale_api/common/serializers.py
+++ b/api/funkwhale_api/common/serializers.py
@@ -359,3 +359,12 @@ class RateLimitSerializer(serializers.Serializer):
     enabled = serializers.BooleanField()
     ident = IdentSerializer()
     scopes = serializers.ListField(child=ScopesSerializer())
+
+
+class ErrorDetailSerializer(serializers.Serializer):
+    detail = serializers.CharField(source="*")
+
+
+class TextPreviewSerializer(serializers.Serializer):
+    rendered = serializers.CharField(read_only=True, source="*")
+    text = serializers.CharField(write_only=True)
diff --git a/api/funkwhale_api/common/views.py b/api/funkwhale_api/common/views.py
index a19927599..6f0a5d896 100644
--- a/api/funkwhale_api/common/views.py
+++ b/api/funkwhale_api/common/views.py
@@ -18,6 +18,11 @@ from config import plugins
 
 from funkwhale_api.users.oauth import permissions as oauth_permissions
 
+from funkwhale_api.common.serializers import (
+    ErrorDetailSerializer,
+    TextPreviewSerializer,
+)
+
 from . import filters
 from . import models
 from . import mutations
@@ -205,18 +210,21 @@ class AttachmentViewSet(
 class TextPreviewView(views.APIView):
     permission_classes = []
 
-    @extend_schema(operation_id="preview_text")
+    @extend_schema(
+        operation_id="preview_text",
+        responses={200: TextPreviewSerializer, 400: ErrorDetailSerializer},
+    )
     def post(self, request, *args, **kwargs):
         payload = request.data
         if "text" not in payload:
-            return response.Response({"detail": "Invalid input"}, status=400)
+            return response.Response(
+                ErrorDetailSerializer("Invalid input").data, status=400
+            )
 
         permissive = payload.get("permissive", False)
-        data = {
-            "rendered": utils.render_html(
-                payload["text"], "text/markdown", permissive=permissive
-            )
-        }
+        data = TextPreviewSerializer(
+            utils.render_html(payload["text"], "text/markdown", permissive=permissive)
+        ).data
         return response.Response(data, status=200)
 
 
diff --git a/api/tests/common/test_views.py b/api/tests/common/test_views.py
index 3e1255fcc..cb7f37811 100644
--- a/api/tests/common/test_views.py
+++ b/api/tests/common/test_views.py
@@ -273,6 +273,16 @@ def test_attachment_destroy_not_owner(factories, logged_in_api_client):
     attachment.refresh_from_db()
 
 
+def test_render_fails_for_no_text(api_client):
+    payload = {}
+    url = reverse("api:v1:text-preview")
+    response = api_client.post(url, payload)
+
+    expected = {"detail": "Invalid input"}
+    assert response.status_code == 400
+    assert response.data == expected
+
+
 def test_can_render_text_preview(api_client, db):
     payload = {"text": "Hello world"}
     url = reverse("api:v1:text-preview")
diff --git a/changes/changelog.d/1903.enhancement b/changes/changelog.d/1903.enhancement
new file mode 100644
index 000000000..eff5f045e
--- /dev/null
+++ b/changes/changelog.d/1903.enhancement
@@ -0,0 +1 @@
+Add proper serialization for TextPreviewView (#1903)