nodejs

Learn how NestJS modules work: feature modules, shared modules, global modules, dynamic modules, and how the module system organizes your application architecture.

Connect Express.js to MongoDB with Mongoose ODM. Learn schema design, CRUD operations, validation, relationships with population, pagination, and build a complete blog API with users, posts, and comments.

Add rich link previews and SEO optimization to your URL shortener. Implement OG meta tag scraping, social share preview pages, dynamic OG image generation, link preview caching, and bot-aware redirect handling for Facebook, Twitter, Slack, and LinkedIn.

Add role-based access control and admin user management to your URL shortener. Implement admin roles, permission middleware, user CRUD operations, account suspension, and admin promotion with Prisma and Express.

Build URL moderation tools, bulk operations, and abuse detection for your URL shortener admin panel. Implement link flagging, bulk status updates, malicious URL scanning, domain blocklists, and automated abuse prevention.

Build system-wide analytics and audit logging for your URL shortener admin panel. Implement dashboard metrics, click trends, top URLs rankings, user growth charts, admin action audit trails, and real-time system health monitoring.

Build a comprehensive testing strategy for your URL shortener. Write unit tests with Vitest, integration tests with Supertest, database tests with test containers, and load tests with k6 for redirect throughput.

Deep dive into URL shortening algorithms. Implement Base62 encoding, handle collisions at scale, support custom aliases, and understand the math behind short code uniqueness and collision probability.

Add Redis caching and rate limiting to your URL shortener. Implement cache-aside pattern for sub-millisecond redirects, sliding window rate limiting, cache invalidation strategies, and Redis connection management.

Build a high-performance redirect engine and click analytics system. Learn 301 vs 302 redirects, non-blocking click tracking, user-agent parsing, geolocation, and analytics aggregation queries with PostgreSQL.