security-review

Comprehensive security checklist and patterns for authentication, input validation, secrets management, and sensitive operations. This skill ensures all code follows security best practices and identifies potential vulnerabilities. Before ANY production deployment: Remember : Security is not optional. One vulnerability can compromise the entire platform. When in doubt, err on the side of caution. - Covers 10 core security domains: secrets management, input validation, SQL injection prevention, authentication/authorization, XSS prevention, CSRF protection, rate limiting, sensitive data exposure, blockchain wallet verification, and dependency security - Includes code examples for each vulnerability type with clear "never do this" and "always do this" patterns across TypeScript, SQL, and configuration - Provides pre-deployment checklist with 16 verification items and automated security test examples for authentication, authorization, input validation, and rate limiting - Supports multiple frameworks and platforms: Next.js, Supabase (with Row Level Security), Express, Solana blockchain, and standard Node.js environments - Implementing authentication or authorization - Handling user input or file uploads - Creating new API endpoints - Working with secrets or credentials - Implementing payment features - Storing or transmitting sensitive data - Integrating third-party APIs - OWASP...