Best Practices for Validation 🛡️

Validation is a critical step in ensuring data integrity and security. Here are key principles to follow:

1. Input Validation ⚠️

  • Always sanitize and validate user inputs to prevent injection attacks (e.g., SQL, XSS).
  • Use whitelisting over blacklisting for safer constraints.
  • Example:
    data validation

2. Output Sanitization 📤

  • Escape special characters when rendering user-provided data (e.g., HTML, JSON).
  • Avoid directly exposing raw data to the client without checks.
  • Example:
    output_sanitization

3. Business Rule Validation 📊

  • Enforce domain-specific rules (e.g., age limits, payment validations).
  • Combine server-side and client-side checks for a layered defense.
  • Example:
    business_rules

4. Validation Libraries 📚

Use trusted tools like OWASP ESAPI or Express Validator for robust implementation.

For deeper insights into security practices related to validation, check our guide on Security Best Practices.