Node.js
33 articles · written by Niraj Kumar
This is the largest cluster on the site, and it is deliberately operational rather than introductory. The assumption throughout is that you can already write an Express handler and the question is what happens to it under load, under attack, or at three in the morning.
Topics include REST API design (naming, versioning, pagination), JWT and OAuth 2.0 authentication with refresh-token rotation, rate limiting and caching strategies, file uploads to a CDN, Stripe payments and webhook handling, real-time services with Socket.IO and Redis Streams, GraphQL with Apollo, and zero-downtime deployment behind Nginx.
Several posts pair with the Docker and DevOps hubs, since most of these decisions only bite once the service is actually deployed.
- Event-Driven ArchitectureLangGraphNode.js
Architecting Event-Driven AI Agent Workflows: Integrating LangGraph, Node.js, and AWS for Real-Time Automation
Stop polling APIs. Learn how to build real-time, event-driven multi-agent AI workflows with LangGraph, Ollama local LLMs, Node.js, Express, n8n, Make.com, Socket.io, Next.js, Docker, and AWS — a practical 2026 blueprint for sovereign AI automation.
- LLM GatewayAI FinOpsNode.js
Architecting a Self-Hosted Hybrid LLM Gateway: Dynamic Cost Routing, Semantic Caching, and Usage Billing with Node.js, Ollama, and Next.js
A hands-on 2026 guide to building a self-hosted hybrid LLM gateway with Node.js, Express, Nginx, and Ollama. Route LangGraph traffic by query complexity and latency, cache semantically in PostgreSQL with pgvector, log token telemetry in MongoDB, stream live costs to a Next.js dashboard, and bill usage through Stripe, Razorpay, and Cashfree.
- MCPModel Context ProtocolLangGraph
Engineering Custom MCP Servers for Local AI Agents: Bridging PostgreSQL, MongoDB, and REST APIs with LangGraph and Next.js
A hands-on 2026 guide to building secure TypeScript MCP servers that connect local Ollama models and Claude Code to PostgreSQL, MongoDB, and REST APIs, orchestrated with LangGraph, streamed to a Next.js dashboard, and deployed with Docker and Nginx on AWS.
- LangChainAI AgentsNext.js
Automating Enterprise B2B SaaS: Integrating LangChain AI Agents, Next.js, and Zapier Workflows on AWS
A practical 2026 blueprint for building an AI-driven B2B SaaS: LangChain agents, a Next.js + Tailwind + Shadcn UI frontend, secure Express APIs with OAuth and JWT, Zapier automations, and zero-downtime Docker, Nginx and AWS deployments.
- UnityNode.jsSocket.io
Building a Server-Authoritative Multiplayer Game Backend: Real-Time State Sync with Unity, Node.js, and Socket.io
Learn how to build a server-authoritative multiplayer game backend with Node.js, Express, Socket.io, MongoDB and a Unity C# client, then ship it with Docker, GitHub Actions and zero-downtime deploys on AWS Linux.
- Payment Gateway IntegrationNode.jsExpress.js
Architecting Multi-Gateway Payment Systems: Orchestrating Webhooks with Node.js, n8n, and PostgreSQL on AWS
A practical 2026 blueprint for building a resilient multi-gateway payment backend. Integrate Stripe, Razorpay, and Cashfree with Express.js and PostgreSQL idempotency, automate reconciliation with self-hosted n8n and Make.com, push real-time updates with Socket.io, and ship it all with Docker, CI/CD, and AWS.
- React NativeClaude CodeSocket.io
AI-Assisted Mobile Development in 2026: Scaling React Native Apps with Claude Code, Socket.io, and Stripe
A hands-on 2026 guide to building a real-time, scalable React Native app with Claude Code, Redux Toolkit, Node.js, MongoDB, Socket.io, JWT/OAuth, Stripe and Razorpay, then deploying it on AWS with Nginx and a modern CI/CD pipeline.
- PostgreSQLCDCSemantic Cache
How to Prevent AI Context Poisoning using PostgreSQL CDC for Real-Time Semantic Cache Invalidation in Node.js
Learn how to stop stale semantic caches from poisoning your AI agents. Build a real-time invalidation pipeline with PostgreSQL CDC, a Node.js worker, and an embedding similarity radius to flush outdated cache entries instantly.
- AI AgentsNode.jsVector Database
How to Build an Agentic Memory Garbage Collector in Node.js to Prevent Vector Store Context Poisoning
Learn how to build a Node.js memory garbage collector for AI agents. Implement time-weighted relevance decay, semantic deduplication, and safe pruning to stop vector store context poisoning and hallucination cascades.
- LangGraph.jsAI AgentsContext Engineering
How to Implement Hierarchical Context Compaction in LangGraph.js to Prevent Agent Context Drift
A practical, code-first guide to building a hierarchical context compaction layer in LangGraph.js — using Ollama for local summarization and PostgreSQL checkpointing to stop long-running AI agents from drifting off-goal.
- pgvectorPostgreSQLNode.js
How to Sync pgvector Embeddings in Real-Time using PostgreSQL Triggers and Node.js Background Workers
Stop relying on cron jobs for vector search. Learn how to build a real-time, event-driven pipeline using PostgreSQL triggers, an outbox table, and isolated Node.js background workers to keep pgvector embeddings fresh without locking your production database.
- Node.jsLLM SecurityPII Masking
How to Build a Two-Way PII Masking and Re-hydration Middleware in Node.js for Enterprise LLM Pipelines
A production-focused guide to building an Express.js middleware that detects, tokenizes, and re-hydrates PII in real time — keeping GDPR- and HIPAA-sensitive data out of your LLM prompts without breaking conversational context.
- AbortControllerNext.jsNode.js
How to Kill Zombie LLM Streams: Propagating AbortController from Next.js to Node.js and Ollama
Stop paying for tokens nobody reads. Learn how to propagate AbortController from Next.js through Express, LangChain and Ollama so closing a tab or clicking Stop actually halts GPU inference.
- AI SecurityPrompt InjectionNode.js
How to Build a Zero-Trust AI Sanitization Middleware in Node.js to Prevent Indirect Prompt Injection
Learn how to build a zero-trust sanitization middleware in Node.js and TypeScript using Express and js-tiktoken to defend against indirect prompt injection, enforce hard token limits, and stop untrusted RAG data from hijacking agentic tool calls.
- DockerNode.jsAI Agents
How to Build a Secure Docker-Isolated Code Execution Sandbox for AI Agents in Node.js
Learn how to safely run untrusted LLM-generated code using Node.js and the Docker Engine API. A practical guide to ephemeral containers, cgroup limits, network isolation, and seccomp profiles for AI agent sandboxes.
- RPACrewAIPlaywright
How to Replace Legacy RPA with Autonomous Multi-Agent Workflows using CrewAI, Playwright, and Node.js
Learn how to replace brittle, rule-based RPA scripts with resilient, goal-driven multi-agent systems built with CrewAI, Playwright, and Node.js. Includes real code for autonomous web navigation, JSON validation, and PostgreSQL integration.
- Node.jsDockerNginx
How to Automate Zero-Downtime Deployments for Node.js using Docker, Nginx, and GitHub Actions on AWS EC2
Automate blue-green deployment for Node.js on AWS EC2 with Docker, Nginx and GitHub Actions — no dropped requests, no killed WebSocket connections.
- Socket.ioRedisJWT
How to Secure and Scale Real-Time Presence with Socket.io, Redis Streams, and JWT Auth in Node.js
Scale Socket.io horizontally with the Redis Streams adapter, secure WebSocket handshakes with JWT middleware, and keep presence accurate.
- pgvectorPostgreSQLRAG
How to Implement Hybrid Search with pgvector and Full-Text Search in PostgreSQL for Node.js RAG Pipelines
Combine pgvector embeddings with PostgreSQL full-text search using Reciprocal Rank Fusion for accurate, hallucination-resistant RAG in Node.js.
- Node.jsDockerGitHub Actions
Automating Node.js Docker Deployments with GitHub Actions and Nginx
Build a custom GitHub Action that builds, pushes and deploys a Dockerized Node.js app behind an Nginx reverse proxy — a full automated pipeline.
- Node.jsExpressJWT
Secure API Authentication: Implementing JWT and OAuth2 in Node.js and Express
Build production authentication in Node.js and Express with JWT, Google OAuth2, session handling, and role-based access control that actually holds.
- StripeNode.jsPayments
Integrating Stripe with Node.js: Payments, Webhooks, and Subscriptions
Integrate Stripe with Node.js step by step — one-time payments, secure webhook handling, and recurring subscriptions, with real code examples.
- DockerNode.jsDevOps
Docker for Developers: From Zero to Deploying a Node.js App
Learn Docker with a real Node.js app — Dockerfiles, multi-stage builds, Docker Compose, and pushing images to a container registry.
- Node.jsMulterAWS S3
Handling File Uploads and Images in Node.js: From Form to CDN
Handle file and image uploads in Node.js with Multer, Amazon S3 and signed URLs — covering security, performance, and CDN delivery in production.
- GraphQLNode.jsApollo
Building a GraphQL API on Node.js with Apollo or KitQL
Build a production GraphQL API on Node.js with Apollo Server or KitQL — schema design, resolvers, and hybrid REST/GraphQL for mixed clients.
- Node.jsRedisRate Limiting
Rate Limiting, Caching, and Monitoring Your Node.js APIs
Harden Node.js APIs with Redis rate limiting, caching strategies, and observability via Prometheus and structured logs — production-ready code.
- Socket.IOReactNode.js
Real-Time Features with Socket.IO: Live Chat, Notifications, and Dashboards
Build real-time chat, push notifications and live dashboards with Socket.IO on React and Node.js — including scaling, auth, and production practices.
- AuthenticationJWTSecurity
Building a Secure Auth Flow with JWT, Refresh Tokens, and Rate Limiting
Build a production auth system with JWT access tokens, rotating refresh tokens and rate limiting — registration, login, protected routes, refresh.
- Node.jsREST APIExpress
Node.js 22+ Best Practices for Building REST APIs in 2026
Build production REST APIs with Node.js 22+ — folder structure, error handling, validation, logging, and performance tips for Express and Fastify.
- OllamaLLMLocal AI
Ollama in Practice: Running Local LLMs on Your Dev Machine
Install Ollama, pull and manage open-source LLMs, run terminal chats, and wire local models into Node.js and Python — no tokens leave your machine.
- TypeScriptNext.jsNode.js
Full-Stack TypeScript for 2026: Building a Job-Ready App with Next.js, Node, and Postgres
Build a production full-stack TypeScript app with Next.js, Node.js and PostgreSQL — setup to deploy, with the patterns hiring teams expect.
- SecurityJavaScriptOWASP
Secure-by-Design Web Apps: Implementing OWASP Top 10 in a Modern JavaScript Stack
Implement OWASP Top 10 controls in React, Next.js and Node.js — building secure web apps from the ground up, with practical code examples.
- WebSocketsWebRTCReal-Time
Real-Time Experiences on the Web: Building Live Dashboards with WebSockets and WebRTC
Build real-time web apps with WebSockets and WebRTC — live dashboards, collaborative tools and analytics, plus architecture and common pitfalls.
Related topics
- Retrieval-Augmented Generation (RAG)
- LangChain & LangGraph
- Large Language Models
- AI Agents
- Next.js
- React
- TypeScript
- PostgreSQL
- Docker & Containers
- DevOps
- CI/CD
- Application Security
- AWS
- n8n Automation