Prompt Engineering
& LLM Guides
Practical guides on writing better prompts, cutting token costs and building with LLM APIs, for ChatGPT, Claude and Gemini users.
Fix Node.js MaxListenersExceededWarning
Node's MaxListenersExceededWarning means a listener is piling up somewhere. Here's how to find and fix the real leak instead of raising the limit.
Exponential Backoff for OpenAI API Calls
How to implement exponential backoff with jitter for OpenAI API calls in Node.js, and why queue concurrency matters more than your retry formula.
Connection Pool Exhaustion: The Real Fix
Database connection pool exhaustion causes hanging requests and timeouts under load. Here is what actually causes it and how to fix your pool setup for good.
OpenAI Function Calling in a Laravel App
How to wire OpenAI function calling into a Laravel backend so an LLM can trigger real actions, plus the validation and loop-depth safeguards you actually need.
Cursor-Based Pagination for REST APIs
Offset pagination slows down and returns duplicate rows at scale. Here's why that happens and how to implement cursor-based pagination in a REST API.
Fix OpenAI API Rate Limit Errors in Node.js
Get 429 rate_limit_exceeded errors from the OpenAI API in Node.js? Here is the real fix: exponential backoff, retry-after handling, and concurrency limits.
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.
MySQL Composite Index Optimization Guide
Learn MySQL composite index optimization: leftmost-prefix rules, correct column ordering, covering indexes, and verifying gains with EXPLAIN plans.
REST API Idempotency Keys: A Guide
Learn how REST API idempotency keys prevent duplicate charges and orders, with a practical Node.js and Redis-backed implementation guide and code example.
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