React 19 Project Tutorial – AI Code Explainer

Learn how to use React 19 and AI LLMs to code an AI-powered Code Explainer App from scratch. We’ll design the app, configure an Express.js backend, set up a REST endpoint that talks to an LLM, and then integrate everything into a modern React 19 app (with Vite + TailwindCSS). Course developed by @tapasadhikary ⭐️ Resources ⭐️ - Code: https://github.com/tapascript/codesplain - Join Tapas's Discord: https://discord.gg/ux9BchWEW3 - Nebius AI Studio: https://studio.nebius.com/ - Open AI API: https://platform.openai.com/docs/overview - React 19 & TailwindCSS: https://github.com/atapas/code-in-react-19 ❤️ Try interactive React courses we love, right in your browser: https://scrimba.com/freeCodeCamp-React (Made possible by a grant from our friends at Scrimba) ⭐️ Chapters ⭐️ - 0:00:00 Building With AI - 0:01:51 What are We Building? - 0:03:06 App Design - 0:04:22 Configure AI LLMs - 0:09:24 Configure Express.js Server - 0:18:29 Create Explain Code REST Endpoint - 0:25:01 Integrating LLM with API - 0:35:15 Test API with Postman - 0:39:04 React with Vite - 0:42:24 Component Architecture - 0:45:01 Heading - 0:46:40 Explain Form - 0:51:07 React 19 useActionState & Server Action - 1:00:37 Code Explanation & Error - 1:01:41 Formatting Output - 1:03:46 Tasks & Bonus 🎉 Thanks to our Champion and Sponsor supporters: 👾 Drake Milly 👾 Ulises Moralez 👾 Goddard Tan 👾 David MG 👾 Matthew Springman 👾 Claudio 👾 Oscar R. 👾 jedi-or-sith 👾 Nattira Maneerat 👾 Justin Hual -- Learn to code for free and get a developer job: https://www.freecodecamp.org Read hundreds of articles on programming: https://freecodecamp.org/news