add OTP generator utility with customizable options

Author: dev-aditya-lab

package.json

@@ -1,6 +1,6 @@
 {
   "name": "web-power-kit",
-  "version": "1.0.0-beta.0",
+  "version": "1.0.0-beta.1",
   "description": "A powerful toolkit that simplifies access to browser features like clipboard, notifications, battery, vibration, and more — perfect for modern web developers.",
   "keywords": [
     "webdev",

src/index.ts

@@ -1 +1,2 @@
 export * from "./browser";
+export * from "./utils";

src/utils/index.ts

@@ -0,0 +1 @@
+export * from "./otp";

src/utils/otp/index.ts

@@ -0,0 +1,60 @@
+/**
+ * @fileoverview
+ * A powerful and flexible OTP (One-Time Password) generator
+ * Supports digits, uppercase, lowercase, symbols, and custom length
+ */
+
+export interface OTPOptions {
+  /** Include digits like 0–9 (default: true) */
+  digits?: boolean;
+  /** Include lowercase letters like a–z */
+  lowerCase?: boolean;
+  /** Include uppercase letters like A–Z */
+  upperCase?: boolean;
+  /** Include symbols like @, #, $, %, etc. */
+  symbols?: boolean;
+}
+
+/**
+ * Generate a secure, random OTP using specified options.
+ * Uses crypto.getRandomValues() for cryptographically secure randomness.
+ *
+ * @param length - Total length of the OTP (e.g., 6)
+ * @param options - Character type options to include
+ * @returns A string containing the generated OTP
+ */
+export function generateOTP(length: number, options: OTPOptions = { digits: true }): string {
+  // Character pools
+  const digitChars = '0123456789';
+  const lowerChars = 'abcdefghijklmnopqrstuvwxyz';
+  const upperChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+  const symbolChars = '!@#$%^&*()_+[]{}<>?';
+
+  // Combine selected character types into one string
+  let characters = '';
+
+  if (options.digits) characters += digitChars;
+  if (options.lowerCase) characters += lowerChars;
+  if (options.upperCase) characters += upperChars;
+  if (options.symbols) characters += symbolChars;
+
+  // Ensure at least one type is selected
+  if (!characters) {
+    throw new Error('At least one character type must be enabled in options.');
+  }
+
+  let otp = '';
+
+  // Secure randomness: get 'length' random numbers using crypto API
+  const cryptoObj = window.crypto || (window as any).msCrypto; // msCrypto fallback for old Edge
+  const randomValues = new Uint32Array(length);
+  cryptoObj.getRandomValues(randomValues);
+
+  // Build OTP by mapping each random number to character in pool
+  for (let i = 0; i < length; i++) {
+    const index = randomValues[i] % characters.length;
+    otp += characters.charAt(index);
+  }
+
+  return otp;
+}