Missing Input Validation on API Endpoints

Your API endpoints generated by Claude Code accept any input without validation, allowing malformed data, oversized payloads, or malicious content to reach your business logic and database. There are no checks on field types, lengths, formats, or required fields.

Without input validation, attackers can submit negative prices, inject SQL through string fields, send payloads that crash your server, or store garbage data that breaks your application later. Even non-malicious users can accidentally submit invalid data that causes downstream errors.

This often becomes apparent when your database contains impossible values, when your app crashes on unexpected input, or when a security audit flags every endpoint as vulnerable.