diff --git a/continew-starter-log/continew-starter-log-httptrace-pro/src/main/java/top/charles7c/continew/starter/log/httptracepro/handler/RecordableServletHttpRequest.java b/continew-starter-log/continew-starter-log-httptrace-pro/src/main/java/top/charles7c/continew/starter/log/httptracepro/handler/RecordableServletHttpRequest.java
index 8afd6134..87dc6895 100644
--- a/continew-starter-log/continew-starter-log-httptrace-pro/src/main/java/top/charles7c/continew/starter/log/httptracepro/handler/RecordableServletHttpRequest.java
+++ b/continew-starter-log/continew-starter-log-httptrace-pro/src/main/java/top/charles7c/continew/starter/log/httptracepro/handler/RecordableServletHttpRequest.java
@@ -80,9 +80,10 @@ public final class RecordableServletHttpRequest implements RecordableHttpRequest
     public String getBody() {
         ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
         if (null != wrapper) {
-            return StrUtil.utf8Str(wrapper.getContentAsByteArray());
+            String body = StrUtil.utf8Str(wrapper.getContentAsByteArray());
+            return JSONUtil.isTypeJSON(body) ? body : null;
         }
-        return StringConstants.EMPTY;
+        return null;
     }
 
     @Override