Test Field-Specific Error Messages

✅ What's Fixed

Before: Generic "Registration failed. Please try again." message

❌ Registration failed. Please try again.

After: Specific field errors with clear guidance

✅ Username: "This username is already taken. Please choose another."
✅ Email: "This email is already registered. Please use a different email."
✅ Phone: "This phone number is already registered. Please use a different phone number."

🎯 Field-Specific Error Examples

Username Errors

❌ Username is required

❌ Username must be at least 3 characters

❌ Username can only contain letters, numbers, and underscores

❌ This username is already taken. Please choose another.

Email Errors

❌ Email is required

❌ Please enter a valid email address

❌ This email is already registered. Please use a different email.

Phone Number Errors

❌ Phone number is required

❌ Please enter a valid Rwanda phone number (+250XXXXXXXXX or 07XXXXXXXX)

❌ This phone number is already registered. Please use a different phone number.

Full Name Errors

❌ Full name is required

❌ Full name must be at least 2 characters

❌ Full name can only contain letters, spaces, hyphens, apostrophes, and periods

❌ Please enter your complete name (first and last name)

Password Errors

❌ Password is required

❌ Password must be at least 8 characters long

❌ Password must contain at least one letter

❌ Password must contain at least one number

Location Errors

❌ Province is required

❌ District is required

❌ Please select a valid province

❌ Please select a valid district for the selected province

🧪 How to Test

Start the servers:
python app.py (Backend on port 7060)
python run_frontend.py (Frontend on port 8000)
Open registration form: https://prodevroger-ishingiro.hf.space/register
Test field-specific errors:
- Try submitting with empty fields
- Try invalid email formats
- Try invalid phone numbers
- Try weak passwords
- Try registering with existing username/email/phone
Verify: Each field shows its specific error message below the field

📱 Visual Error Display

Errors now appear:

Below each field with specific error message
With red border around invalid fields
With green border around valid fields
Real-time validation as user types or leaves fields
No generic error banner at the top of the form

🎯 Benefits

Better User Experience: Users know exactly what to fix
Clear Guidance: Specific error messages guide users
Visual Feedback: Red/green borders show field status
Real-time Validation: Immediate feedback as user types
Professional Appearance: Clean, modern error display

🔧 Technical Implementation

Backend Changes (app.py)

Returns structured error responses: {"errors": {"field": "message"}}
Field-specific validation for all inputs
Duplicate check errors for username, email, phone
Comprehensive validation rules

Frontend Changes (register.js)

Parses structured error responses
Shows field-specific errors below each field
Visual error/success states for fields
Real-time validation on user interaction

CSS Changes (auth.css)

Error state styling (red borders, shadows)
Success state styling (green borders, shadows)
Error message styling
Help text styling

✅ Test Results Expected

✅ SUCCESS: Each field shows its specific error message below the field, with visual indicators (red border for errors, green border for success). No generic error banner appears at the top of the form.

🔧 Field-Specific Error Messages Test