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From Smart to Smarter: The Journey of a React App and the Magic of LangChain Imagine you’ve built a simple but clever app. It’s a React-based interface that talks to a local AI model—Ollama—and answers questions using your own JSON data. You feel proud, and rightly so. It’s fast, private, and doesn’t rely on any cloud services. You’re not paying for API calls, and your data stays safe on your machine.