diff --git a/README.md b/README.md
index 683881f9f..cedf9af90 100644
--- a/README.md
+++ b/README.md
@@ -243,8 +243,8 @@ byte[] text = JSON.toJSONBytes(data);
 import com.alibaba.fastjson2.*
 
 val data = ... // Any
-val text = text.toJSONString() // String
-val bytes = text.toJSONByteArray() // ByteArray
+val text = data.toJSONString() // String
+val bytes = data.toJSONByteArray() // ByteArray
 ```
 
 ### 2.5 使用`JSONObject`、`JSONArray`
diff --git a/README_EN.md b/README_EN.md
index b2892489d..a2b2b5700 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -234,8 +234,8 @@ byte[] text = JSON.toJSONBytes(data);
 import com.alibaba.fastjson2.*
 
 val data = ... // Any
-val text = text.toJSONString() // String
-val bytes = text.toJSONByteArray() // ByteArray
+val text = data.toJSONString() // String
+val bytes = data.toJSONByteArray() // ByteArray
 ```
 
 ### 2.5 Use `JSONObject`, `JSONArray`
diff --git a/docs/index.md b/docs/index.md
index c17a03d8b..aecf3838f 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -194,8 +194,8 @@ byte[] text = JSON.toJSONBytes(data);
 import com.alibaba.fastjson2.*
 
 val data = ... // Any
-val text = text.toJSONString() // String
-val bytes = text.toJSONByteArray() // ByteArray
+val text = data.toJSONString() // String
+val bytes = data.toJSONByteArray() // ByteArray
 ```
 
 ### 2.5 使用`JSONObject`、`JSONArray`
diff --git a/docs/kotlin_cn.md b/docs/kotlin_cn.md
index 50375f5f3..7c00edfc5 100644
--- a/docs/kotlin_cn.md
+++ b/docs/kotlin_cn.md
@@ -127,14 +127,14 @@ val data = text.into<Map<String, User>>() // Map<String, User>
 
 ```kotlin
 val data = "..." // Any
-val text = text.toJSONString() // String
+val text = data.toJSONString() // String
 ```
 
 序列化为字节数组:
 
 ```kotlin
 val data = "..." // Any
-val bytes = text.toJSONByteArray() // ByteArray
+val bytes = data.toJSONByteArray() // ByteArray
 ```
 
 ### 2.5 使用`JSONObject`、`JSONArray`
diff --git a/docs/kotlin_en.md b/docs/kotlin_en.md
index 172d31f48..fdda29e91 100644
--- a/docs/kotlin_en.md
+++ b/docs/kotlin_en.md
@@ -127,14 +127,14 @@ Serialization as a string:
 
 ```kotlin
 val data = "..." // Any
-val text = text.toJSONString() // String
+val text = data.toJSONString() // String
 ```
 
 Serialization as a ByteArray:
 
 ```kotlin
 val data = "..." // Any
-val bytes = text.toJSONByteArray() // ByteArray
+val bytes = data.toJSONByteArray() // ByteArray
 ```
 
 ### 2.5 Use `JSONObject`、`JSONArray`