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JoyMini API — Enterprise-Level NestJS Backend Architecture Practice

A unified backend platform built with NestJS + Prisma + PostgreSQL + Redis + BullMQ, supporting 200+ API endpoints across 4 frontend applications

Project Cases

NestJS Sensitive Word Filtering: AC Automaton Pipe Implementation and Performance Optimization

The blog system's comment content uses the AC Automaton algorithm for sensitive word detection, integrated transparently as a NestJS Pipe. It covers a three-level sensitive word grading strategy, detection performance of < 1ms for a 100,000-word dictionary, a Redis hot-update mechanism, and a multi-layered defense design.

Security Protection

NestJS Like Deduplication: Fingerprint + Redis Guard Pattern with Distributed Lock

The like endpoint of the blog system implements an anti-spam mechanism using the Fingerprint + Redis Guard pattern. This covers the fingerprint formula (MD5 hash), SET NX atomic operation, 24-hour expiration strategy, and a graceful degradation plan when Redis is unavailable.

Security Protection

NestJS Device Fingerprint Risk Control System: Redis Blacklist, Multi-Account Detection, and 24h Withdrawal Cooldown

An in-depth analysis of a production-grade NestJS device security service, covering the complete implementation of Redis dual-cache strategy, multi-account detection, automatic banning, and withdrawal cooldown.

Security Protection

WebRTC Signaling Gateway: NestJS WebSocket Real-Time Call Signaling Design

In-depth analysis of NestJS's CallGateway based on Socket.IO WebRTC signaling gateway design, covering triple delivery guarantee for call invitations, Offer/Answer SDP exchange, ICE candidate relay, Redis offline caching, and FCM push wake-up

Backend Development

Financial Audit System: NestJS Xendit Payout + @DistributedLock + Cron Ghost Order Auto-Recovery

In-depth analysis of a production-grade financial audit system, covering distributed locks to prevent duplicate payouts, Xendit third-party payout integration, Cron auto-recovery mechanisms, and a complete state machine design.

Backend Development

Redis Distributed Lock System: Decorator-Based Concurrency Control

JoyMini API's distributed lock system is based on Redis SET NX PX atomic operations and Lua script unlocking, providing a declarative API through the @DistributedLock decorator, covering three modes: Cron task deduplication, API endpoint rate limiting, and nested critical sections.

Interface Management

QueueMonitorService: BullMQ Queue Monitoring Dashboard

The JoyMini API queue monitoring service builds a real-time dashboard based on the BullMQ event system, tracking queue status, Job progress, failure rates, and processing latency, supporting visual operations in the admin backend.

Interface Management

GroupService Group Buying System: Redis Optimistic Lock + BullMQ Settlement Queue

JoyMini's group buying system is based on Redis optimistic locking to prevent overselling and a BullMQ settlement queue for asynchronous profit distribution, covering the complete transactional flow of group creation, joining, automatic group formation, and settlement.

Interface Management

Device Security and Risk Control: Multi-Layer Defense for Fintech Applications

The JoyMini API's multi-layer device security defense system, encompassing device fingerprinting, rate limiting, CSRF dual middleware, reCAPTCHA v3 verification, and OTP throttler, constructs a complete security chain from request to response.

Interface Management