Nestjs

Overview A full-featured URL Shortener API built with enterprise-grade architecture. The service generates short, unique aliases for long URLs and handles redirections with minimal latency. Designed to handle high read-to-write ratios (100:1) with support for multiple user types (Guest, User, Admin), click analytics, and automatic link expiration. Tech Stack TypeScript & Node.js 20+ - Type-safe backend development NestJS - Progressive Node.js framework with dependency injection PostgreSQL - Relational data storage for users and authentication AWS DynamoDB - Distributed, scalable storage for short links with single-table design TypeORM - Database migrations and entity management JWT (RS256) - Secure authentication with cookie-based tokens Docker & Docker Compose - Containerized development environment CircleCI - CI/CD pipeline with parallel test execution Serverless Framework - AWS Lambda deployment support nanoid - Collision-resistant unique ID generation Key Features URL Shortening - Generate 10-character short codes with collision handling URL Redirection - HTTP 302 redirect with click tracking Link Lifecycle Management - Activate, deactivate, and extend expiry Automatic Expiration - DynamoDB TTL for automatic cleanup Role-Based Access Control - Hierarchical permissions (Admin > User > Guest) API Versioning - URI-based versioning for backward compatibility Swagger Documentation - Auto-generated OpenAPI docs Cursor Pagination - Efficient Base64-encoded pagination Challenges & Solutions Dual Database Strategy: Needed different characteristics for different data types. Used PostgreSQL for relational user data requiring strong consistency, and DynamoDB for URL storage needing high scalability. This hybrid approach optimizes performance for different access patterns. ...