diff --git a/src/Formatters/StringFormatter.php b/src/Formatters/StringFormatter.php
new file mode 100644
index 0000000..ccd1bdd
--- /dev/null
+++ b/src/Formatters/StringFormatter.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Formatters;
+
+use InvalidArgumentException;
+use Web3\Utils;
+use Web3\Formatters\IFormatter;
+
+class StringFormatter implements IFormatter
+{
+    /**
+     * format
+     * 
+     * @param mixed $value
+     * @return string
+     */
+    public static function format($value)
+    {
+        return Utils::toString($value);
+    }
+}
\ No newline at end of file