Global Validation

Prevent injection attacks by validating and sanitizing all user input on the server side, enforcing allowlists over blocklists, and escaping data before database queries or HTML rendering. This protects against SQL, XSS, and command injection vulnerabilities across forms, API endpoints, and background jobs.

Implement dual-layer validation: use client-side checks for immediate user feedback on format and required fields, then enforce critical server-side validation to sanitize inputs, check data types, ranges, and business rules. Server-side validation is essential for security since client-side checks can be bypassed.

Validate API inputs by checking data types, enforcing format requirements, verifying ranges, and sanitizing against injection attacks. Apply consistent validation rules across all endpoints and return field-specific error messages to guide users toward correct input.

Allowlists define exactly what input is acceptable and reject everything else, making them more secure than blocklists which try to block known bad patterns. Allowlists are the recommended approach for input validation because they prevent unknown or novel attack vectors.

Yes, apply the same validation logic to background jobs and scheduled tasks that process user data. Server-side validation with input sanitization ensures data integrity and security even when data enters your system through asynchronous or batch processing paths.

Field-specific, user-friendly error messages guide users to fix invalid input quickly, improving experience and reducing support burden. Consistent error messaging across forms, APIs, and all entry points also prevents attackers from inferring system structure through error responses.