A practical developer checklist for input sanitization, authentication session control, rate limiting, and CORS configuration.
Defense in Depth
Application security cannot be an afterthought bolted on prior to launch. It starts with validated user inputs, strict environment variable management, sanitized database queries, and secure HTTP header enforcement.
Session Management & JWT Hygiene
Never store sensitive JWT tokens or API keys in unencrypted localStorage where XSS attacks can read them. Prefer HTTP-only, Secure, SameSite cookies for session tokens, paired with short expiration times and refresh token rotation.