diff --git a/generators/lengthGen.js b/generators/lengthGen.js
new file mode 100644
index 0000000..825ae93
--- /dev/null
+++ b/generators/lengthGen.js
@@ -0,0 +1,2 @@
+const { randomBytes } = require('crypto');
+module.exports = (length, charset) => [...randomBytes(length)].map((byte) => charset[Number(byte) % charset.length]).join('').slice(1).concat(charset[0]);
\ No newline at end of file
diff --git a/generators/zws.js b/generators/zws.js
index 95d8563..77d5a28 100644
--- a/generators/zws.js
+++ b/generators/zws.js
@@ -1,3 +1,3 @@
-const { randomBytes } = require('crypto');
+const lengthGen = require('./lengthGen');
 const zeroWidthChars = ['\u200B', '\u200C', '\u200D', '\u2060'];
-module.exports = ({ length }) => [...randomBytes(length)].map(byte => zeroWidthChars[Number(byte) % zeroWidthChars.length]).join('').slice(1) + zeroWidthChars[0];
+module.exports = ({ length }) => lengthGen(length, zeroWidthChars);