One mistake developers make:
Trusting frontend validation too much.
You add:
- Required fields
- Email validation
- Password rules
- Input limits
- Disabled buttons
Everything looks secure.
But a user can still bypass all of that.
They can send requests directly to your API without using your frontend.
That means your backend still needs to validate:
- Input types
- Required fields
- Permissions
- Authentication
- Data limits
- Business rules
Frontend validation is for a better user experience.
Backend validation is what protects your application.
Never assume the frontend will always send the right data.
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