diff --git a/cmd/server/files.go b/cmd/server/files.go
index ea4a0f4e..b53cd0ab 100644
--- a/cmd/server/files.go
+++ b/cmd/server/files.go
@@ -201,7 +201,12 @@ func deleteFile(logger log.Logger, repo WireFileRepository) http.HandlerFunc {
 
 		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		w.WriteHeader(http.StatusOK)
-		json.NewEncoder(w).Encode(`{"error": null}`)
+
+		type response struct {
+			Error error `json:"error"`
+		}
+
+		json.NewEncoder(w).Encode(&response{Error: nil})
 	}
 }
 
@@ -287,7 +292,12 @@ func validateFile(logger log.Logger, repo WireFileRepository) http.HandlerFunc {
 		logger.Log("validated file")
 		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		w.WriteHeader(http.StatusOK)
-		json.NewEncoder(w).Encode(`{"error": null}`)
+
+		type response struct {
+			Error error `json:"error"`
+		}
+		
+		json.NewEncoder(w).Encode(&response{Error: nil})
 	}
 }
 
diff --git a/cmd/server/files_test.go b/cmd/server/files_test.go
index b78d01fa..c9088f6d 100644
--- a/cmd/server/files_test.go
+++ b/cmd/server/files_test.go
@@ -264,6 +264,7 @@ func TestFiles_deleteFile(t *testing.T) {
 		w.Flush()
 
 		assert.Equal(t, http.StatusOK, w.Code, w.Body)
+		assert.Contains(t, w.Body.String(), `{"error":null}`)
 	})
 
 	t.Run("repo error", func(t *testing.T) {
@@ -411,8 +412,7 @@ func TestFiles_validateFile(t *testing.T) {
 		router.ServeHTTP(w, req)
 		w.Flush()
 
-		assert.Equal(t, http.StatusOK, w.Code, w.Body)
-		assert.Contains(t, w.Body.String(), `"{\"error\": null}"`)
+		assert.Contains(t, w.Body.String(), `{"error":null}`)
 	})
 
 	t.Run("repo error", func(t *testing.T) {