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Prompt Engineering
& LLM Guides
Practical guides on writing better prompts, cutting token costs and building with LLM APIs, for ChatGPT, Claude and Gemini users.
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Sep 24, 20265 min read
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.
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Sep 22, 20267 min read
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.
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Sep 17, 20266 min read
JWT Authentication in Full-Stack Apps
Learn JWT authentication for full-stack apps: short-lived access tokens, refresh token rotation, secure client storage, and true token revocation.
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