Create frontend/src/api/client.js

frontend/src/api/client.js

@@ -0,0 +1,10 @@
+import axios from "axios";
+
+const api = axios.create({
+  baseURL: "/api", // same domain, backend mounted under /api
+  headers: {
+    "Content-Type": "application/json"
+  }
+});
+
+export default api;