diff --git a/react-openapi/api/client.ts b/react-openapi/api/client.ts
index a7f8aef..97abc9e 100644
--- a/react-openapi/api/client.ts
+++ b/react-openapi/api/client.ts
@@ -7,6 +7,28 @@ import { createApiClient } from "../../react-auth";
 let _api: AxiosInstance | null = null;
 let _auth: AxiosInstance | null = null;
 
+function withParamsSerializer(instance: AxiosInstance): AxiosInstance {
+  instance.defaults.paramsSerializer = {
+    serialize: (params) => {
+      const searchParams = new URLSearchParams();
+
+      Object.entries(params).forEach(([key, value]) => {
+        if (Array.isArray(value)) {
+          value.forEach((v) => {
+            searchParams.append(key, String(v)); // NO []
+          });
+        } else if (value !== undefined && value !== null) {
+          searchParams.append(key, String(value));
+        }
+      });
+
+      return searchParams.toString();
+    },
+  };
+
+  return instance;
+}
+
 export const api = {
   get: (...args: Parameters<AxiosInstance["get"]>) => {
     if (!_api) throw new Error("API client not initialized");
@@ -38,6 +60,6 @@ export const auth = {
 };
 
 export function initializeApiClients(baseUrl: string, authBaseUrl: string) {
-  _api = createApiClient(baseUrl);
-  _auth = createApiClient(authBaseUrl);
+  _api = withParamsSerializer(createApiClient(baseUrl));
+  _auth = withParamsSerializer(createApiClient(authBaseUrl));
 }