WebSocket

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

Next.js Blog Comment System: A Complete Architecture from AI Moderation to Optimistic Updates

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

NestJS WebSocket IM Customer Service System: From Group Chat Crisis to Virtual Agent Multi-Channel Architecture

Deep Dive into NestJS Backend Architecture: Dual-Domain JWT, Device Security Guard, and Distributed Locks

IM Chat & Contact/Group Architecture – Message Engine + Session Management + Group Permissions + Friend Relationship Full Chain

In-depth analysis of the client-side IM instant messaging system: from Message Meta-First Engine, SeqId Cursor Pagination, EventEmitter² Event Decoupling, to Group Management (Kick/Mute/Promote-Demote/Transfer/Dismiss), Friend Relationships (Apply/Process/Search State Machine), Group Join Request Approval Workflow, and WebRTC ICE Server Dynamic Credential Generation, covering 900+ lines of ChatService full source code.

Customer Service Real-time Chat System — WebSocket Real-time Push + 6 Message Types + Session Management

In-depth analysis of the admin-next new customer service chat system: from WebSocket real-time communication, 30s polling fallback, cursor-based pagination for message history, to 6 types of rich media messages (text/image/audio/video/file/location) rendering, Bot proxy replies, forced recall, and session closure, covering the complete frontend and backend chain.

useChatSocket — Socket.IO Practice for Admin Customer Service Real-Time Communication

useChatSocket is a 250-line custom React Hook that encapsulates the complete lifecycle management of Socket.IO real-time communication, including connection management, room isolation, unified event dispatch, message mapping, and ACK timeout sending patterns.