[Backend] Add Input Validation and Sanitization for All API Endpoints

[ayomideadeniran]

🚀 Feature Overview

Add robust input validation to prevent injection attacks and data corruption with comprehensive sanitization.

This is an essential, MVP-critical feature designed to protect against common web vulnerabilities.

🛠️ Implementation Requirements

• Build input validation and sanitization system.
• Include comprehensive unit tests with coverage >90%.
• Add thorough documentation and educational comments.
• Integrate with existing API infrastructure.

🔧 Technical Specifications

• Built with Node.js and Express.
• Use zod for validation schemas.
• Include comprehensive sanitization.
• Follow security best practices.

✅ Acceptance Criteria

• Input validation works correctly.
• Sanitization prevents injection attacks.
• All unit tests pass with full coverage.
• Documentation is complete and educational.

🎓 Difficulty Level

Intermediate - Requires understanding of security and Node.js development.

⏱️ Timeline

ETA: 1 day

[SYLVIANNORUKA]

@SYLVIANNORUKA has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Can I work on this pls? I will Add Input Validation and Sanitization for All API Endpoints.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @SYLVIANNORUKA to this issue.