diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 0000000..0d5661d
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,6 @@
+export const maskApiKey = (key: string | null): string => {
+    if (!key) return '*****';
+    return key.length <= 5
+        ? '*'.repeat(key.length)
+        : key.slice(0, 5) + '*'.repeat(key.length - 5);
+};