NestJS

0 articles

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

iOS HLS Video Playback Pitfalls and Solutions: Comprehensive Analysis of CoreMediaErrorDomain -12642

An in-depth analysis of the root cause of the iOS CoreMediaErrorDomain -12642 (FormatUnsupported) error, with systematic investigation and remediation across multiple dimensions including FFmpeg encoding parameters, HLS Playlist configuration, and H.264 Level constraints, based on real-world cases.

System Architecture

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.

Interface Management

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.

Interface Management

Quill Rich Text Video Embedding to HLS Adaptive Streaming: Complete Frontend Replacement Implementation

This article details how to automatically replace MP4 video tags embedded in the Quill rich text editor with HLS m3u8 adaptive streaming in a blog system's article detail page. It covers the backend conversion pipeline, multi-video storage with meta.contentVideo, frontend Markdown/HTML dual-path replacement, IndexedDB cache layer fixes, and 6 key bugs encountered in practice along with their solutions.

Frontend Development

4-Core Server Backend Optimization Report: Why Cluster Mode Is Not the Answer

This article documents the multi-core optimization evaluation process for a NestJS API backend deployed on a 4-core VPS. It analyzes the feasibility of Cluster mode, UV_THREADPOOL_SIZE, database query optimization, Redis caching, and Nginx cache tuning one by one, ultimately concluding that "the bottleneck is DB I/O, not CPU."

Performance Optimization

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.

Interface Management

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 reCAPTCHA v3 Integration in Practice: Unnoticeable Human Verification, Blocking Script Bots from Scratch

The comment interface of the blog system is under attack from script bots. By integrating Google reCAPTCHA v3, we achieve unnoticeable human verification. This covers the complete implementation of RecaptchaService, a four-tier score processing strategy, Guard integration, and frontend token acquisition.

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