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Build an AI-powered Code Explainer application from scratch using React 19 and AI Large Language Models in this comprehensive tutorial. Design the application architecture, configure an Express.js backend server, and set up REST endpoints that communicate with LLMs to create a modern web application. Start by exploring the project design and configuring AI LLMs including Nebius AI Studio and OpenAI API, then move on to building the backend infrastructure with Express.js server setup and creating the explain code REST endpoint. Learn to integrate LLM functionality with your API and test the implementation using Postman before transitioning to the frontend development. Develop the React 19 application using Vite and TailwindCSS, focusing on component architecture including heading components and explain forms. Master React 19's new features including useActionState hook and Server Actions for handling form submissions and state management. Implement code explanation functionality with proper error handling and output formatting to create a polished user experience. Complete the tutorial with additional tasks and bonus features to extend your application's capabilities.
