Feature Inventory: Distributed URL Shortener Engine

Overview of Core Features

• F1: Collision-Resistant Nanoid Slug Generation: High-entropy 7-character Base62/URL-safe string generation with over 4.3 trillion unique permutations.
• F2: Atomic Redirection & Real-Time Click Telemetry: Sub-millisecond HTTP 302 redirection with atomic MongoDB $inc click counters that prevent race conditions.
• F3: Custom Vanity Alias & Collision Detection: Allows registered users to specify customized vanity slugs with database-enforced unique constraints (11000 duplicate key handling).
• F4: Secure Cookie-Based JWT Authentication: Stateless identity verification using httpOnly cookies, password hashing with bcrypt, and contextual req.user injection.
• F5: TanStack Query Server State & Redux Dashboard: Real-time URL management table with optimistic cache updates, instant clipboard copying, and user history tracking.

Say It Out Loud (Feature Summary)

"When presenting this project, I highlight the balance between speed and data integrity. On one hand, redirection must be blisteringly fast—which I achieve through single-hop indexed database lookups and HTTP 302 redirects. On the other hand, analytics must be completely accurate, so I implemented atomic increments at the database layer rather than separate read-and-write passes that could cause race conditions under high concurrency."