diff --git a/solution/pulse/pulse/middleware.py b/solution/pulse/pulse/middleware.py
new file mode 100644
index 0000000..1cf02b8
--- /dev/null
+++ b/solution/pulse/pulse/middleware.py
@@ -0,0 +1,14 @@
+from django.http import JsonResponse
+from rest_framework import status
+
+
+class ErrorResponseMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+        if response.status_code >= status.HTTP_400_BAD_REQUEST:
+            response.data = {"reason": response.data}
+            response = JsonResponse(response.data, status=response.status_code)
+        return response
diff --git a/solution/pulse/pulse/settings.py b/solution/pulse/pulse/settings.py
index 6180ac5..4a7010f 100644
--- a/solution/pulse/pulse/settings.py
+++ b/solution/pulse/pulse/settings.py
@@ -38,6 +38,8 @@ MIDDLEWARE = [
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    # Developed middleware
+    "pulse.middleware.ErrorResponseMiddleware",
 ]
 
 ROOT_URLCONF = "pulse.urls"
@@ -112,6 +114,9 @@ STATIC_ROOT = BASE_DIR / "static"
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
 REST_FRAMEWORK = {
+    "DEFAULT_RENDERER_CLASSES": [
+        "rest_framework.renderers.JSONRenderer",
+    ],
     "DEFAULT_FILTER_BACKENDS": [
         "django_filters.rest_framework.DjangoFilterBackend"
     ],