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Data Validators - Format Validation Tools

Data Validators

Professional format validation tools for various data types. These validators check format compliance only and do not verify against external databases.

Credit Card Validator

Validate credit card numbers using the Luhn algorithm. Identifies card type (Visa, Mastercard, Amex, etc.).

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ISBN Validator

Validate ISBN-10 and ISBN-13 book identification numbers with checksum verification.

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IBAN Validator

Validate International Bank Account Numbers (IBAN) with mod-97 checksum verification.

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VAT Number Validator

Validate EU VAT (Value Added Tax) numbers for all European Union member states.

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URL Validator

Validate and parse URLs, checking format compliance and extracting URL components.

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IP Address Validator

Validate IPv4 and IPv6 addresses, identifying private, loopback, and multicast addresses.

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MAC Address Validator

Validate MAC addresses in various formats and normalize them to standard notation.

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Phone Number Formatter

Format and validate phone numbers for US, UK, and international formats.

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Postal Code Validator

Validate postal codes and ZIP codes for US, UK, and Canada.

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SSN Format Validator

Validate US Social Security Number format (XXX-XX-XXXX pattern) - format checking only.

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About Data Validators

Data validators are essential tools for ensuring data quality and format compliance in modern applications. These validators perform format checking and algorithmic validation without connecting to external databases or verification services. They help developers, QA testers, and data analysts ensure that data conforms to expected formats before processing or storage.

Why Use Format Validators?

  • Data Quality: Ensure data meets expected format standards before processing
  • Error Prevention: Catch format errors early in the data pipeline
  • Development Testing: Test validation logic without real data
  • Compliance: Verify data formats meet regulatory requirements
  • User Experience: Provide immediate feedback on data entry forms

Important Privacy Notice

Format Validation Only: These tools perform format checking only and do not store, transmit, or verify data against external databases. They are safe for testing with sample data but should not be used with real sensitive information in production environments. Always handle sensitive data (like credit card numbers, SSNs, and bank account numbers) according to applicable security standards and regulations.

Common Use Cases

  • Form Validation: Pre-validate user input before submission
  • Data Migration: Verify format compliance during data transfers
  • API Testing: Generate and validate test data for API endpoints
  • Quality Assurance: Automated testing of validation logic
  • Data Cleanup: Identify and fix format inconsistencies in datasets

Validation Algorithms

Different data types use different validation algorithms:

  • Luhn Algorithm: Used for credit card numbers and other identification numbers
  • Check Digits: Used in ISBN, IBAN, and other standardized formats
  • Regular Expressions: Used for pattern matching in postal codes, phone numbers, etc.
  • Modulo Operations: Used in IBAN and various check digit calculations

Best Practices

  • Always validate data on both client-side and server-side
  • Use test data generators for development and testing
  • Never trust client-side validation alone for security
  • Implement proper error handling for validation failures
  • Keep validation rules up to date with current standards
  • Consider internationalization when validating formats