diff --git a/Sources/YData/Extensions/String+random.swift b/Sources/YData/Extensions/String+random.swift
new file mode 100644
index 0000000..73bd8c1
--- /dev/null
+++ b/Sources/YData/Extensions/String+random.swift
@@ -0,0 +1,12 @@
+import Foundation
+
+public extension String {
+  static func random(length: Int) -> String {
+    let letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?+-*/=_#$%&"
+    var s = ""
+    for _ in 0 ..< length {
+      s.append(letters.randomElement()!)
+    }
+    return s
+  }
+}