diff --git a/docs/uts/buildin-object-api/json.md b/docs/uts/buildin-object-api/json.md
index de668209c4da39ced0810c4c81080492a8ce8d57..5d6f43798cb23a287dd96d8d8f77e68953515d91 100644
--- a/docs/uts/buildin-object-api/json.md
+++ b/docs/uts/buildin-object-api/json.md
@@ -13,7 +13,7 @@ JSON.parse() 方法用来解析 JSON 字符串，构造由字符串描述的对
 
 ```ts
 const json = `{"result":true, "count":42}`;
-const obj = JSON.parse(json);
+const obj = JSON.parse(json) as UTSJSONObject;
 
 console.log(obj["count"]);
 // expected output: 42