diff --git a/relay/misc.py b/relay/misc.py
index face943..25c0a1e 100644
--- a/relay/misc.py
+++ b/relay/misc.py
@@ -7,6 +7,7 @@ import typing
 
 from aiohttp.web import Response as AiohttpResponse
 from aputils.message import Message as ApMessage
+from datetime import datetime
 from uuid import uuid4
 
 if typing.TYPE_CHECKING:
@@ -74,6 +75,14 @@ def get_app() -> Application:
 	return Application.DEFAULT
 
 
+class JsonEncoder(json.JSONEncoder):
+	def default(self, obj: Any) -> str:
+		if isinstance(obj, datetime):
+			return obj.isoformat()
+
+		return JSONEncoder.default(self, obj)
+
+
 class Message(ApMessage):
 	@classmethod
 	def new_actor(cls: type[Message],  # pylint: disable=arguments-differ
@@ -193,8 +202,8 @@ class Response(AiohttpResponse):
 		if isinstance(body, bytes):
 			kwargs['body'] = body
 
-		elif isinstance(body, (dict, list, tuple, set)) and ctype in {'json', 'activity'}:
-			kwargs['text'] = json.dumps(body)
+		elif isinstance(body, (dict, list, tuple, set)) or ctype in {'json', 'activity'}:
+			kwargs['text'] = json.dumps(body, cls = JsonEncoder)
 
 		else:
 			kwargs['text'] = body
@@ -209,7 +218,7 @@ class Response(AiohttpResponse):
 				ctype: str = 'text') -> Response:
 
 		if ctype == 'json':
-			body = json.dumps({'error': body})
+			body = {'error': body}
 
 		return cls.new(body=body, status=status, ctype=ctype)
 
diff --git a/relay/views/api.py b/relay/views/api.py
index 56a5a25..07a5c9a 100644
--- a/relay/views/api.py
+++ b/relay/views/api.py
@@ -166,12 +166,8 @@ class Config(View):
 @register_route('/api/v1/instance')
 class Inbox(View):
 	async def get(self, request: Request) -> Response:
-		data = []
-
 		with self.database.session() as conn:
-			for inbox in conn.execute('SELECT * FROM inboxes'):
-				inbox['created'] = inbox['created'].isoformat()
-				data.append(inbox)
+			data = tuple(conn.execute('SELECT * FROM inboxes').all())
 
 		return Response.new(data, ctype = 'json')
 
@@ -241,7 +237,7 @@ class Inbox(View):
 class DomainBan(View):
 	async def get(self, request: Request) -> Response:
 		with self.database.session() as conn:
-			bans = conn.execute('SELECT * FROM domain_bans').all()
+			bans = tuple(conn.execute('SELECT * FROM domain_bans').all())
 
 		return Response.new(bans, ctype = 'json')
 
@@ -298,7 +294,7 @@ class DomainBan(View):
 class SoftwareBan(View):
 	async def get(self, request: Request) -> Response:
 		with self.database.session() as conn:
-			bans = conn.execute('SELECT * FROM software_bans').all()
+			bans = tuple(conn.execute('SELECT * FROM software_bans').all())
 
 		return Response.new(bans, ctype = 'json')
 
@@ -355,7 +351,7 @@ class SoftwareBan(View):
 class Whitelist(View):
 	async def get(self, request: Request) -> Response:
 		with self.database.session() as conn:
-			items = conn.execute('SELECT * FROM whitelist').all()
+			items = tuple(conn.execute('SELECT * FROM whitelist').all())
 
 		return Response.new(items, ctype = 'json')