API Parameter Validation & Security Hardening
Secure API endpoints with rigorous parameter validation and protection
What You Can Do
You get Claude to analyze your API specifications and automatically generate bulletproof parameter validation logic. Claude creates security-hardened middleware, enforces type constraints, detects malicious input patterns, and generates comprehensive error handling — all tailored to your framework and existing codebase. The result is production-ready validation code with zero unvalidated inputs reaching your business logic.
Features
SQL, NoSQL, command injection pattern detection
OWASP compliance, input sanitization rules
Example Output
Validation Middleware (Express.js):
const validateCreateUser = (req, res, next) => {
const { email, password, age } = req.body;
// Type validation
if (typeof email !== 'string') throw new ValidationError('email must be string');
if (typeof password !== 'string') throw new ValidationError('password must be string');
if (typeof age !== 'number') throw new ValidationError('age must be number');
// Format validation
if (!email.match(/^[^@]+@[^@]+\.[^@]+$/)) throw new ValidationError('invalid email format');
if (password.length < 12) throw new ValidationError('password min 12 chars');
// Range validation
if (age < 18 || age > 120) throw new ValidationError('age must be 18-120');
next();
};
Security Checklist:
- ✅ All query parameters validated before DB queries
- ✅ No string concatenation in SQL (parameterized queries only)
- ✅ User input sanitized for HTML/JSON output
- ✅ Rate limiting: 100 req/min per IP for auth endpoints
- ✅ All 5xx errors logged; users see generic "server error"
What's Included
- SKILL.md: Core validation logic & security methodology
- Framework templates: Pre-built validation middleware for Express, FastAPI, Django
- Security checklist: OWASP Top 10 validation rules per parameter type
- OpenAPI schema validator: Extracts validation rules from your spec
- Error response templates: Standardized JSON error format with field-level messages
- Edge-case test generator: Adversarial test cases (negative numbers, SQL keywords, XSS payloads)
- Rate limiting config: Strategy guide + implementation examples
- Validation rule library: Email, URL, phone, credit card, enum patterns
Who It's For
- Backend and API engineers building or auditing endpoints
- Security engineers hardening microservices against injection attacks
- DevOps and infrastructure teams enforcing API governance
- Full-stack developers migrating between frameworks
- Startup CTOs scaling validation consistency across teams
Best For
- Designing new API endpoints with bulletproof input validation
- Security audits on existing APIs to find unvalidated parameters
- Migrating endpoints to new frameworks (preserve validation logic)
- Building microservices that share consistent error response formats
- Enforcing OWASP compliance across your entire API surface
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