diff --git a/decodePK.js b/decodePK.js
new file mode 100644
index 0000000..ccf596c
--- /dev/null
+++ b/decodePK.js
@@ -0,0 +1,5 @@
+let base64url = require('base64url');
+
+const pk = process.argv[2];
+
+console.log(base64url.toBuffer(pk).toString('hex'));