Prompt Engineering
& LLM Guides
Practical guides on writing better prompts, cutting token costs and building with LLM APIs, for ChatGPT, Claude and Gemini users.
Shopify Webhook HMAC Verification Fix
Fix Shopify webhook HMAC verification failures in Node.js and Laravel by capturing the raw request body before parsing and comparing it correctly.
Node.js Worker Threads for CPU-Heavy Tasks
Learn how Node.js worker threads move CPU-intensive tasks off the event loop, with a working Express example and when to pick them over clustering.
Fix CORS Errors in React + Node.js Apps
Learn why the 'No Access-Control-Allow-Origin' CORS error happens in React + Node.js apps, and the exact Express fix that solves it for good.
PostgreSQL EXPLAIN ANALYZE With AI: A Guide
Learn to read PostgreSQL EXPLAIN ANALYZE output with AI: capture the plan, write a precise prompt, automate it in Node.js, and verify every fix.
AI Prompts to Debug Node.js Stack Traces
Debugging Node.js stack traces with AI works only with the right prompt structure. A real TypeError, a proven prompt, and the fix, step by step.
AI Code Review Prompts for Pull Requests
Copy five practical AI code review prompts for pull requests, plus a Node.js script to run them in CI. Catch bugs and security issues faster.
Docker Multi-Stage Builds for Node.js Apps
Learn how Docker multi-stage builds for Node.js shrink images from 1 GB to under 150 MB, with a production Dockerfile and CI caching tips you can copy.
Node.js RAG Pipeline: pgvector + OpenAI
Build a Node.js RAG pipeline with pgvector and OpenAI embeddings for grounded, source-backed AI answers without running a separate vector database.
Nginx Reverse Proxy Setup for Node.js Apps
Configure Nginx as a reverse proxy for Node.js: headers, WebSockets, HTTPS, and the mistakes that cause 502s in production.
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