diff --git a/par-api/src/main/java/com/par/api/controller/AccessResultController.java b/par-api/src/main/java/com/par/api/controller/AccessResultController.java
index 67a3167..7c460c7 100644
--- a/par-api/src/main/java/com/par/api/controller/AccessResultController.java
+++ b/par-api/src/main/java/com/par/api/controller/AccessResultController.java
@@ -37,7 +37,7 @@ public class AccessResultController {
 
         String configVersion = (String) payload.get("configVersion");
         String contentType = (String) payload.getOrDefault("contentType", "html");
-        String content = (String) payload.get("content");
+        String content = toStringValue(payload.get("content"));
         String url = (String) payload.get("url");
         Integer statusCode = payload.get("statusCode") instanceof Integer i ? i : null;
         Integer responseTimeMs = payload.get("responseTimeMs") instanceof Integer i ? i : null;
@@ -133,4 +133,10 @@ public class AccessResultController {
         int affected = accessResultService.batchValidateUrl(siteId, url, isValid);
         return ApiResponse.success(Map.of("affected", affected));
     }
+
+    private String toStringValue(Object obj) {
+        if (obj == null) return null;
+        if (obj instanceof String s) return s;
+        try { return new com.fasterxml.jackson.databind.ObjectMapper().writeValueAsString(obj); } catch (Exception e) { return null; }
+    }
 }
diff --git a/par-api/src/main/java/com/par/api/controller/ConfigController.java b/par-api/src/main/java/com/par/api/controller/ConfigController.java
index a7e3b23..c66e51f 100644
--- a/par-api/src/main/java/com/par/api/controller/ConfigController.java
+++ b/par-api/src/main/java/com/par/api/controller/ConfigController.java
@@ -25,6 +25,7 @@ public class ConfigController {
 
     private final ConfigService configService;
     private final CachedStorageService storageService;
+    private static final com.fasterxml.jackson.databind.ObjectMapper objectMapper = new com.fasterxml.jackson.databind.ObjectMapper();
 
     public ConfigController(ConfigService configService, CachedStorageService storageService) {
         this.configService = configService;
@@ -127,7 +128,7 @@ public class ConfigController {
             HttpServletRequest request) {
 
         String version = (String) payload.get("version");
-        String configJson = (String) payload.get("config");
+        String configJson = toStringValue(payload.get("config"));
         String schemaVersion = (String) payload.get("schemaVersion");
 
         if (version == null || configJson == null) {
@@ -139,4 +140,10 @@ public class ConfigController {
         SiteConfig config = configService.submitConfig(siteId, version, configJson, schemaVersion, submitterId);
         return ApiResponse.success(configService.toDTO(config));
     }
+
+    private String toStringValue(Object obj) {
+        if (obj == null) return null;
+        if (obj instanceof String s) return s;
+        try { return objectMapper.writeValueAsString(obj); } catch (Exception e) { return null; }
+    }
 }