diff --git a/zerver/tests/test_service_bot_system.py b/zerver/tests/test_service_bot_system.py
index b5900e2bd9..5166f335ba 100644
--- a/zerver/tests/test_service_bot_system.py
+++ b/zerver/tests/test_service_bot_system.py
@@ -299,7 +299,7 @@ class TestServiceBotStateHandler(ZulipTestCase):
             "keys": ["This is a list, but should be a serialized string."],
         }
         result = self.client_get("/json/bot_storage", invalid_params)
-        self.assert_json_error(result, 'Argument "keys" is not valid JSON.')
+        self.assert_json_error(result, "keys is not valid JSON")
 
         params = {
             "keys": orjson.dumps(["key 1", "nonexistent key"]).decode(),
@@ -311,7 +311,7 @@ class TestServiceBotStateHandler(ZulipTestCase):
             "storage": orjson.dumps({"foo": [1, 2, 3]}).decode(),
         }
         result = self.client_put("/json/bot_storage", params)
-        self.assert_json_error(result, "storage contains a value that is not a string")
+        self.assert_json_error(result, 'storage["foo"] is not a string')
 
         # Remove some entries.
         keys_to_remove = ["key 1", "key 2"]
diff --git a/zerver/views/storage.py b/zerver/views/storage.py
index 9c13acfb96..8988907ef6 100644
--- a/zerver/views/storage.py
+++ b/zerver/views/storage.py
@@ -1,6 +1,7 @@
 from typing import Dict, List, Optional
 
 from django.http import HttpRequest, HttpResponse
+from pydantic import Json
 
 from zerver.lib.bot_storage import (
     StateError,
@@ -10,17 +11,17 @@ from zerver.lib.bot_storage import (
     set_bot_storage,
 )
 from zerver.lib.exceptions import JsonableError
-from zerver.lib.request import REQ, has_request_variables
 from zerver.lib.response import json_success
-from zerver.lib.validator import check_dict, check_list, check_string
+from zerver.lib.typed_endpoint import typed_endpoint
 from zerver.models import UserProfile
 
 
-@has_request_variables
+@typed_endpoint
 def update_storage(
     request: HttpRequest,
     user_profile: UserProfile,
-    storage: Dict[str, str] = REQ(json_validator=check_dict([], value_validator=check_string)),
+    *,
+    storage: Json[Dict[str, str]],
 ) -> HttpResponse:
     try:
         set_bot_storage(user_profile, list(storage.items()))
@@ -29,11 +30,12 @@ def update_storage(
     return json_success(request)
 
 
-@has_request_variables
+@typed_endpoint
 def get_storage(
     request: HttpRequest,
     user_profile: UserProfile,
-    keys: Optional[List[str]] = REQ(json_validator=check_list(check_string), default=None),
+    *,
+    keys: Json[Optional[List[str]]] = None,
 ) -> HttpResponse:
     if keys is None:
         keys = get_keys_in_bot_storage(user_profile)
@@ -44,11 +46,12 @@ def get_storage(
     return json_success(request, data={"storage": storage})
 
 
-@has_request_variables
+@typed_endpoint
 def remove_storage(
     request: HttpRequest,
     user_profile: UserProfile,
-    keys: Optional[List[str]] = REQ(json_validator=check_list(check_string), default=None),
+    *,
+    keys: Json[Optional[List[str]]] = None,
 ) -> HttpResponse:
     if keys is None:
         keys = get_keys_in_bot_storage(user_profile)