Sharing insights about front-end and full-stack development with TypeScript, Node.js, React, and friends.https://komelin.com/blogen-ushttps://komelin.com/assets/img/slogan.pnghttps://komelin.com/blogMon, 18 May 2026 23:00:00 GMTMon, 18 May 2026 23:00:00 GMTAll rights reserved 2026, Komelin.comhttps://komelin.com/blog/ai-video-generation-cost-analysishttps://komelin.com/blog/ai-video-generation-cost-analysisThis time, I ran the same prompt through 18 video generation models from 5 providers to compare cost and generation time.Mon, 18 May 2026 23:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/ai-image-generation-cost-analysishttps://komelin.com/blog/ai-image-generation-cost-analysisPicking the wrong image generation model can cost you 18x more and take 10x longer. I ran the same prompt through 25 models from 6 providers to find out.Sat, 18 Apr 2026 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/thin-api-layer-react-vercelhttps://komelin.com/blog/thin-api-layer-react-vercelNot every React app needs Next.js. A single rewrite rule and Hono give you auth, rate limiting, and AI integration without changing your frontend stack.Tue, 17 Mar 2026 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/themeable-web-components-solidjs-css-lite-darkhttps://komelin.com/blog/themeable-web-components-solidjs-css-lite-darkThis tutorial demonstrates how to build a custom HTML element with solid-element and theme it with the light-dark() CSS function.Sat, 12 Jul 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/build-ai-powered-apihttps://komelin.com/blog/build-ai-powered-apiIn this post, I'll explain my tech choice and show you three approaches for building AI-powered APIs.Sat, 28 Jun 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/case-study-automating-appointment-checkshttps://komelin.com/blog/case-study-automating-appointment-checksA simple JS script saved me about 5 hours over 3 months just by checking my place in a queue.Wed, 25 Jun 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/prompts-are-code-dotprompt-firebase-genkithttps://komelin.com/blog/prompts-are-code-dotprompt-firebase-genkitThis tutorial is about the dotPrompt standard. I'll show you how to create and turn AI prompt files into executable functions with Genkit.Sat, 21 Jun 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/ai-framework-comparisonhttps://komelin.com/blog/ai-framework-comparisonI've created a few code examples to compare Vercel AI SDK, Mastra, Langchain.js and Firebase Genkit, and here are my impressions...Thu, 19 Jun 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/using-small-llms-locallyhttps://komelin.com/blog/using-small-llms-locallyIn this post we will go through Ollama server installation, LLM model setup and code integration.Tue, 18 Mar 2025 00:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/first-web3-project-learningshttps://komelin.com/blog/first-web3-project-learningsImpressions, discoveries and tools after two months building my first Web3 project - a great start for web3 explorers.Thu, 08 Dec 2022 13:20:00 GMTKonstantin Komelinhttps://komelin.com/blog/developing-custom-search-box-with-react-selecthttps://komelin.com/blog/developing-custom-search-box-with-react-selectTurn a React-Select dropdown into a fully-fledged autocomplete search box with remote data and result caching.Wed, 07 Sep 2022 07:39:00 GMTKonstantin Komelinhttps://komelin.com/blog/nodejs-certification-my-experience-advicehttps://komelin.com/blog/nodejs-certification-my-experience-adviceHow I passed the OpenJS Node.js Application Developer (JSNAD) certification and my advice for future test-takers.Fri, 08 May 2020 22:00:00 GMTKonstantin Komelinhttps://komelin.com/blog/pipe-streams-node-right-wayhttps://komelin.com/blog/pipe-streams-node-right-wayThe stream piping is one of the features of Node.js which I especially like, so I will show you how to safely use it.Sat, 18 Apr 2020 20:32:00 GMTKonstantin Komelinhttps://komelin.com/blog/security-black-box-blacklist-whitelisthttps://komelin.com/blog/security-black-box-blacklist-whitelistThree security modes every developer should know: black box, blacklist, and whitelist.Tue, 07 Apr 2020 17:59:00 GMTKonstantin Komelinhttps://komelin.com/blog/on-react-app-securityhttps://komelin.com/blog/on-react-app-securityA security checklist for auditing an inherited React app and making sure the existing code is safe.Mon, 23 Mar 2020 15:35:00 GMTKonstantin Komelinhttps://komelin.com/blog/takeaways-kylesimpson-mallorcajs-meetuphttps://komelin.com/blog/takeaways-kylesimpson-mallorcajs-meetupMy takeaways from Kyle Simpson's talk on the economy of keystrokes at the MallorcaJS meetup, October 2019.Sun, 20 Oct 2019 19:48:00 GMTKonstantin Komelin