A modern and responsive authentication system built using HTML, CSS, and Vanilla JavaScript.
This project demonstrates real-world form validation, UI state management, and clean DOM manipulation.
✨ Login & Sign Up Tabs
✨ Client-side Form Validation
✨ Strong Password Validation Rules
✨ Show / Hide Password Toggle
✨ Forgot Password Screen
✨ Responsive Mobile Layout
✨ Clean Modular JavaScript Logic
- HTML5
- CSS3 (Flexbox + Responsive Design)
- Vanilla JavaScript (DOM Manipulation & Validation)
- Valid Email Format Check
- Minimum Password Length Check
- Full Name Required
- Valid Email Pattern
- Minimum 8 Characters Password
- At Least One Uppercase Letter
- At Least One Number
- Confirm Password Match Check
| Client-Side Validation | Server-Side Validation |
|---|---|
| Runs in browser | Runs on backend |
| Faster feedback | More secure |
| Improves UX | Prevents data tampering |
This project demonstrates client-side validation logic using JavaScript.
advanced-html-auth-forms/ │ ├── index.html ├── style.css ├── script.js └── output/ ├── html-form-login.png ├── html-form-signup.png ├── html-form-login-mobile.png └── html-form-signup-mobile.png
If asked:
How did you implement validation?
Using regular expressions, conditional checks, and controlled form submission using
event.preventDefault().
How do you prevent invalid submissions?
By blocking submission until all validation rules pass and displaying contextual error messages.
Why use client-side validation?
To enhance user experience and reduce unnecessary server requests.
- Clean UI Design
- Responsive Layout Strategy
- Form State Handling
- DOM Manipulation
- Event Handling Best Practices
- Practical Real-World Authentication UI
- Backend Integration (Node.js / Express)
- JWT Authentication
- Database Integration
- Toast Notifications
- Accessibility Improvements
Rajeev Ranjan Singh
Frontend Developer
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