Security auth critical
Input Validation & Sanitization
Input validation with Zod and Pydantic, preventing SQL injection, XSS, command injection, and sanitization patterns for secure applications.
- Difficulty
- intermediate
- Read time
- 1 min read
- Version
- v1.0.0
- Confidence
- established
- Last updated
Quick Reference
Validate ALL user input at system boundaries. Use Zod (TypeScript) or Pydantic (Python) for schema validation. Use parameterized queries for SQL (never string concatenation). Escape HTML output (React does this by default). Use allowlists over blocklists. Validate file uploads by content, not extension.
Use When
- Handling user input in forms
- Processing API request data
- Building database queries
- Rendering user-generated content
Skip When
- Internal service-to-service calls with trusted data
- Static content without user input
Input Validation & Sanitization
Input validation with Zod and Pydantic, preventing SQL injection, XSS, command injection, and sanitization patterns for secure applications.