diff --git a/filters/controllers_valid_json.h b/filters/controllers_valid_json.h
index 2eb8d19..7f4ab4d 100644
--- a/filters/controllers_valid_json.h
+++ b/filters/controllers_valid_json.h
@@ -2,19 +2,16 @@
 
 #include <drogon/HttpFilter.h>
 using namespace drogon;
-namespace filters
+namespace filters::controllers
 {
-    namespace controllers
+
+    class valid_json : public HttpFilter<valid_json>
     {
+    public:
+        valid_json() = default;
+        void doFilter(const HttpRequestPtr &req,
+                      FilterCallback &&fcb,
+                      FilterChainCallback &&fccb) override;
+    };
 
-        class valid_json : public HttpFilter<valid_json>
-        {
-        public:
-            valid_json() = default;
-            void doFilter(const HttpRequestPtr &req,
-                          FilterCallback &&fcb,
-                          FilterChainCallback &&fccb) override;
-        };
-
-    }
 }
diff --git a/filters/relays_valid_json.h b/filters/relays_valid_json.h
index 1441e82..707b924 100644
--- a/filters/relays_valid_json.h
+++ b/filters/relays_valid_json.h
@@ -2,19 +2,16 @@
 
 #include <drogon/HttpFilter.h>
 using namespace drogon;
-namespace filters
+namespace filters::relays
 {
-    namespace relays
+
+    class valid_json : public HttpFilter<valid_json>
     {
+    public:
+        valid_json() = default;
+        void doFilter(const HttpRequestPtr &req,
+                      FilterCallback &&fcb,
+                      FilterChainCallback &&fccb) override;
+    };
 
-        class valid_json : public HttpFilter<valid_json>
-        {
-        public:
-            valid_json() = default;
-            void doFilter(const HttpRequestPtr &req,
-                          FilterCallback &&fcb,
-                          FilterChainCallback &&fccb) override;
-        };
-
-    }
 }
diff --git a/filters/schedules_valid_json.h b/filters/schedules_valid_json.h
index e963857..0097bf7 100644
--- a/filters/schedules_valid_json.h
+++ b/filters/schedules_valid_json.h
@@ -2,19 +2,16 @@
 
 #include <drogon/HttpFilter.h>
 using namespace drogon;
-namespace filters
+namespace filters::schedules
 {
-    namespace schedules
+
+    class valid_json : public HttpFilter<valid_json>
     {
+    public:
+        valid_json() = default;
+        void doFilter(const HttpRequestPtr &req,
+                      FilterCallback &&fcb,
+                      FilterChainCallback &&fccb) override;
+    };
 
-        class valid_json : public HttpFilter<valid_json>
-        {
-        public:
-            valid_json() = default;
-            void doFilter(const HttpRequestPtr &req,
-                          FilterCallback &&fcb,
-                          FilterChainCallback &&fccb) override;
-        };
-
-    }
 }