ngx-numeric-captcha
TypeScript
A modern, lightweight Angular CAPTCHA library featuring math, slider, and pattern verification challenges.
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Overview
ngx-numeric-captcha is a versatile Angular library designed to secure web applications by verifying human users through interactive challenges. It provides multiple CAPTCHA types to prevent automated bot submissions on login, registration, and comment forms.
Key Features
- Math CAPTCHA — Arithmetic challenges with dynamic difficulty and auto-regeneration.
- Slider CAPTCHA — Interactive position matching with configurable tolerance and touch support.
- Pattern CAPTCHA — Memory-based sequence challenges with a grid-based input interface.
- Fully Responsive — Optimized layouts and interactions for desktop, tablet, and mobile screens.
- Zero Dependencies — Self-contained with inline SVG icons and minimal bundle size.
- Accessibility — ARIA labels, keyboard navigation, and high contrast compatibility.
- Customizable — CSS custom properties for colors, borders, and typography.
- TypeScript First — Complete type definitions and Angular 17+ compatibility.
Philosophy
The library emphasizes a lightweight, developer-friendly approach with a focus on performance, accessibility, and seamless integration into Angular applications.
Related Projects
Community-curated · Updated weekly · 100% open source
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