diff --git a/render/json.go b/render/json.go
index 3ebcee97..f1f8a6ae 100644
--- a/render/json.go
+++ b/render/json.go
@@ -52,6 +52,11 @@ var (
 	jsonASCIIContentType = []string{"application/json"}
 )
 
+var (
+	leftSquareBracket  = bytesconv.StringToBytes("[")
+	rightSquareBracket = bytesconv.StringToBytes("]")
+)
+
 // Render (JSON) writes data with custom ContentType.
 func (r JSON) Render(w http.ResponseWriter) (err error) {
 	if err = WriteJSON(w, r.Data); err != nil {
@@ -100,11 +105,8 @@ func (r SecureJSON) Render(w http.ResponseWriter) error {
 		return err
 	}
 	// if the jsonBytes is array values
-	if bytes.HasPrefix(jsonBytes, bytesconv.StringToBytes("[")) && bytes.HasSuffix(jsonBytes,
-		bytesconv.StringToBytes("]")) {
-		if _, err = w.Write(bytesconv.StringToBytes(r.Prefix)); err != nil {
-			return err
-		}
+	if bytes.HasPrefix(jsonBytes, leftSquareBracket) && bytes.HasSuffix(jsonBytes, rightSquareBracket) {
+		jsonBytes = append(bytesconv.StringToBytes(r.Prefix), jsonBytes...)
 	}
 	_, err = w.Write(jsonBytes)
 	return err
@@ -128,24 +130,9 @@ func (r JsonpJSON) Render(w http.ResponseWriter) (err error) {
 		return err
 	}
 
-	callback := template.JSEscapeString(r.Callback)
-	if _, err = w.Write(bytesconv.StringToBytes(callback)); err != nil {
-		return err
-	}
-
-	if _, err = w.Write(bytesconv.StringToBytes("(")); err != nil {
-		return err
-	}
-
-	if _, err = w.Write(ret); err != nil {
-		return err
-	}
-
-	if _, err = w.Write(bytesconv.StringToBytes(");")); err != nil {
-		return err
-	}
-
-	return nil
+	jsonpData := fmt.Sprintf("%s(%s);", template.JSEscapeString(r.Callback), bytesconv.BytesToString(ret))
+	_, err = w.Write(bytesconv.StringToBytes(jsonpData))
+	return err
 }
 
 // WriteContentType (JsonpJSON) writes Javascript ContentType.