Global Validation

Prevent SQL injection and XSS by implementing global input validation with allowlists, type checking, and sanitization on both client and server. Server-side validation is mandatory; client-side validation improves UX but cannot be trusted alone. This enforces that all external data—forms, APIs, external sources—meets strict format and content rules before processing.

Implement coordinated validation: client-side checks provide immediate UX feedback, but server-side validation is the security layer. Validate data types, formats (emails, phone numbers, URLs), ranges, required fields, and business rules. Use allowlists to accept only known-good patterns and sanitize to block injection payloads.

Yes. Global input validation covers user forms, API endpoints, and external data sources equally. Treat all incoming data as untrusted, regardless of source. Apply the same allowlist-based type checking, format validation, and sanitization to prevent injection attacks and ensure data integrity.

No. Client-side validation enhances user experience but is not a security boundary—attackers can bypass it. Server-side validation is mandatory and must independently enforce allowlists, type checks, format rules, and sanitization to prevent SQL injection, XSS, and command injection.

Apply type checking (ensure strings, numbers, booleans match expected types), format validation (emails, phone numbers, URLs against strict patterns), range checks (length, numeric bounds), required-field enforcement, and sanitization to remove or escape special characters. Use allowlists to accept only explicitly permitted values.

Validate email format against RFC standards server-side using strict regex or parsing libraries. For passwords, enforce length minimums, character-set rules, and business requirements server-side. Sanitize both inputs to remove injection vectors. Reject any input failing allowlist or format rules before storage.