ajt-validator

A comprehensive, flexible validation library for JavaScript and TypeScript applications that provides robust data validation with minimal configuration.

Features

• Type-safe validation - Built with TypeScript for strong typing
• Modular architecture - Use only the validators you need
• Extensible framework - Create custom validators by extending base classes
• Rich validation results - Detailed error information and metadata
• Zero dependencies - Lightweight and efficient
• Framework agnostic - Works with any JS/TS project

Core Validators

Personal Information

• NameValidator - Name validation with customizable format rules
• DOBValidator - Date of birth validation with age calculations
• AgeValidator - Age validation with minimum and maximum restrictions
• GenderValidator - Gender validation with customizable options
• PassportValidator - Passport number validation with authority checking

Contact Information

• EmailValidator - Email address validation with domain restrictions
• PhoneValidator - Phone number validation with international format support
• AddressValidator - Address validation with customizable field requirements

Financial Information

• BankAccountValidator - Bank account validation with routing number checksum verification
• CreditCardValidator - Credit card validation with Luhn algorithm and card type detection

Authentication

• PasswordValidator - Password strength and format validation with complexity requirements
• UsernameValidator - Username format validation with blocked username detection
• ApiKeyValidator - API key validation with format and prefix validation
• TokenValidator - Authentication token validation including JWT support
• TwoFactorValidator - Two-factor authentication code validation with expiration checking

Internet & Network

• URLValidator - Advanced URL validation with protocol, domain, port, path, and query validation
• IPAddressValidator - Validates IPv4 and IPv6 addresses with subnet restrictions
• DomainValidator - Domain name validation with TLD checking and subdomain rules
• URIValidator - General URI validation according to RFC 3986 standards

General Purpose

• StringValidator - Text validation with length and format options
• NumberValidator - Numeric validation with range checking
• DateValidator - Date format and range validation

Installation

npm install ajt-validator

Usage

import { PersonalValidator, ContactValidator } from 'ajt-validator';

// Validate name
const nameValidator = new PersonalValidator.NameValidator({
  minLength: 2,
  maxLength: 50,
  allowSpecialChars: true
});

const nameResult = nameValidator.validate("O'Connor");
console.log(nameResult.success); // true

// Validate email
const emailValidator = new ContactValidator.EmailValidator({
  strictMode: true,
  blockedDomains: ['temporarymail.com']
});

const emailResult = emailValidator.validate('user@example.com');
console.log(emailResult.success); // true

// Validate address
const addressValidator = new ContactValidator.AddressValidator();
const addressResult = addressValidator.validate({
  street: '123 Main St',
  city: 'New York',
  state: 'NY',
  postalCode: '10001',
  country: 'USA'
});
console.log(addressResult.success); // true

Validation Results

All validators return consistent result objects with:

• isValid - Boolean indicating validation success
• value - The validated (and possibly transformed) value
• errors - Array of detailed error objects with code and message
• errorMessage - Human-readable error message if validation failed
• Additional metadata specific to each validator type

Extending the Library

Create custom validators by extending the base classes:

import { BaseValidator } from 'ajt-validator';

class CustomValidator extends BaseValidator {
  validate(value) {
    // Custom validation logic
  }
}

Extensible Architecture

Each validator can be configured with options for your specific use case:

// Customize phone validation
const phoneValidator = new ContactValidator.PhoneValidator({
  requireCountryCode: true,
  allowedCountryCodes: ['1', '44', '61'], // US, UK, Australia
  minLength: 10,
  maxLength: 15,
  allowExtension: true
});

// Customize address validation
const addressValidator = new ContactValidator.AddressValidator({
  streetRequired: true,
  cityRequired: true,
  stateRequired: false, // Make state optional
  postalCodePattern: /^[0-9]{5}$/, // US 5-digit postal code
  maxStreetLength: 100
});

Creating Custom Validators

Create custom validators by extending the base classes:

import { BaseValidator } from 'ajt-validator';
import { ValidationResult } from 'ajt-validator/interfaces';

class CustomValidator extends BaseValidator<string> {
  validate(value: string): ValidationResult<string> {
    // Custom validation logic
    if (!value) {
      return this.createError('VALUE_REQUIRED', 'Value is required');
    }
    
    // Additional validation...
    
    return this.createSuccess(value);
  }
}

License

MIT