🔒 Validator Utility Class

The Validator class provides a powerful set of reusable validation methods for forms and user input in web applications. From email to IP address, Aadhaar to file types— this utility ensures your data is clean, secure, and well-structured.

✨ Features

• Validate common fields like email, phone, username, password
• Custom pattern matching
• Regional validations (Aadhaar, PAN, GST)
• URL, file, and JSON validations
• Extendable for your own custom logic

🧠 Usage

const validator = new Validator();
const isValid = validator.isEmail("[email protected]");

📧 Email Validation

validator.isEmail("[email protected]") // true

📱 Phone Number (Indian)

validator.isValidPhone("9876543210") // true

🔐 Strong Password

validator.isStrongPassword("Str0ng@123") // true

🧍 Username

validator.isValidUsername("user_name") // true

🌐 URL

validator.isValidURL("https://example.com") // true

🏷️ Pincode (India)

validator.isValidPincode("462001") // true

🔤 Alphabetic Only

validator.isAlphabetic("OnlyLetters") // true

🔢 Numeric Only

validator.isNumeric("123456") // true

🧼 Empty or Whitespace

validator.isEmptyOrWhitespace("   ") // true

📏 Length Between

validator.isValidLength("Hello", 2, 10) // true

📅 Custom Date Format

validator.isValidDateFormat("21-06-2025", "DD-MM-YYYY") // true

🎯 Custom Pattern Matching

validator.customValidation("AB123CD", /^[A-Z]{2}\d{3}[A-Z]{2}$/) // true

🌐 IP Address

validator.isIPAddress("192.168.0.1") // true

📦 JSON

validator.isJSON('{"key": "value"}') // true

💳 Credit Card (Visa/Mastercard basic)

validator.isCreditCard("4111 1111 1111 1111") // true

🇮🇳 Aadhaar (India)

validator.isAadhaar("123412341234") // true

🇮🇳 PAN (India)

 validator.isPAN("ABCDE1234F") // true

🇮🇳 GSTIN (India)

validator.isGST("22ABCDE1234F1Z5") // true

📹 YouTube URL

validator.isYouTubeURL("https://youtu.be/dQw4w9WgXcQ") // true

📁 File Extension

validator.hasValidExtension("resume.pdf", ["pdf", "docx"]) // true