feat: Random base64url

src/index.ts

@@ -1,3 +1,4 @@
 export * from "./random/randomBase64";
+export * from "./random/randomBase64Url";
 export * from "./random/randomHex";
 export * from "./random/randomNumeric";

src/random/randomBase64Url.ts

@@ -0,0 +1,13 @@
+import assert from "node:assert";
+import { randomBytes } from "node:crypto";
+
+/**
+ * Generates a random base64url string with the specified number of characters.
+ * @param charactersCount The number of characters in the generated string.
+ */
+export function randomBase64Url(charactersCount: number) {
+    assert(charactersCount > 0, "charactersCount must be greater than 0");
+
+    const byteCount = Math.ceil((charactersCount * 3) / 4);
+    return randomBytes(byteCount).toString("base64url").substring(0, charactersCount);
+}