Implement comprehensive input sanitization and security features

[vasu-CE]

Team Number : Team 173

Description

This PR introduces a comprehensive input sanitization and validation layer across the backend to improve security, data integrity, and overall API reliability.

Related Issue

Closes #68

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Style/UI improvement

Changes Made

• Added validation middleware for request body, params, and query fields
• Sanitized user inputs to prevent XSS and injection attacks
• Standardized validation rules (e.g., email format, password strength, required fields)
• Added proper error responses for invalid inputs (400 Bad Request)
• Centralized validation logic for better maintainability

Screenshots (if applicable)

Before:

After:

Testing

• Tested on Desktop (Chrome/Firefox/Safari)
• Tested on Mobile (iOS/Android)
• Tested responsive design (different screen sizes)
• No console errors or warnings
• Code builds successfully (npm run build)

Checklist

• My code follows the project's code style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• My changes generate no new warnings
• I have tested my changes thoroughly
• All TypeScript types are properly defined
• Tailwind CSS classes are used appropriately (no inline styles)
• Component is responsive across different screen sizes
• I have read and followed the CONTRIBUTING.md guidelines

Additional Notes

[krishnapaljadeja]

✅ PR Validation Passed

Hey @vasu-CE! Your PR looks good. Here is what we found:

Field	Value
Team Number	Team 173
Linked Issue	Closes #68

A maintainer will review your PR within 24–48 hours. Stay responsive to feedback!

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[krishnapaljadeja]

@vasu-CE can you please resolve the conflicts and rebase it. thankyou

[vasu-CE]

Done. @krishnapaljadeja

[krishnapaljadeja]

🎉 PR Merged — Points Awarded!

Congratulations @vasu-CE! Your contribution has been merged.

Field	Value
Repo	Code_duel_backend
Team	Team 173
Contributor	@vasu-CE
Level	Level 2 — Intermediate
Points Awarded	20 pts
Source	Linked Issue #68

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