Interface Management

Large File Chunked Upload Architecture Design: R2 Multipart Upload from Plan to Implementation

This article provides an in-depth analysis of the technical solution selection for R2 Multipart Upload chunked upload, backend architecture design (Redis session management + pre-signed chunk URLs), the implementation of the frontend FileChunkedUploader utility class, and a comparison with the existing pre-signed URL direct upload solution.

Production Environment Node.js OOM Investigation and Fix: A Complete Record from 300MB Limit to SSE Leak

This article fully documents the investigation process of a NestJS backend crashing in production due to a JavaScript Heap OOM. It analyzes three compounding factors (tight heap limit, SSE connection leak, Prisma memory usage) and provides a step-by-step fix plan.

Translation Parallelism Optimization: Performance Leap from Serial to Concurrent Processing

This article analyzes the fundamental performance bottleneck of the blog translation system—serial processing caused by Worker concurrency=1. Through optimizations such as increasing concurrency and reducing internal latency, translation throughput is improved by approximately 5 times.

API WebSocket Real-time Communication — Gateway + EventEmitter Event Distribution Architecture

WebRTC Call Signaling and Chat DTO Architecture: NestJS Real-Time Communication

Translation System Evolution Chronicle: From DeepSeek Migration to 429 Rate Limiting, Speed Optimization, and Detection Enhancement

This article documents the ongoing operational challenges of the blog translation system after the Provider migration, covering DeepSeek speed optimization, 429 rate limiting handling, category/tag translation detection fixes, and the complete implementation of admin backend translation enhancement features.

SSE Streaming in Translation Quality Detection: A Practical OOM Fix

This article details the complete process of a translation quality detection feature evolving from an OOM crash to an SSE streaming refactor, including cursor pagination fixes, the NestJS @Sse() double-wrapping issue, an authentication scheme for EventSource without custom headers, and the design pattern of a frontend useSSE Hook.

Security Toolchain: OTP Rate Limiter, XSS Sanitization, and reCAPTCHA Verification

**Target Audience:** Backend Engineers, Security Engineers

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.

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.