🎓 Science Teacher Chatbot — Full Explanation (Everything)

🌱 0️⃣ What We Are Building We are building a Science Teacher AI chatbot backend . This AI: answers science questions explains like teacher remembers chat ignores non-science Example: Student: What is gravity? AI: Gravity is a force… Student: explain again AI: As I explained earlier… 👉 AI remembers context. 🧠 1️⃣ How System Works Flow: Student → API → Filter → LangChain → OpenAI → Answer ↑ Memory Steps: Student sends question Express API receives Science filter checks LangChain adds memory OpenAI generates answer API returns response 🧰 2️⃣ Technologies Node.js → backend Express → API LangChain → LLM framework OpenAI → AI brain BufferMemory → chat memory dotenv → API key pnpm → package manager 📦 3️⃣ Create Project mkdir science-teacher-bot cd science-teacher-bot pnpm init 📦 4️⃣ Install Dependencies pnpm add express cors dotenv langchain @langchain/openai nodemon 📁 5️⃣ Folder Structure science-teacher-bot/ │ ├── src/ │ ├── memory.mjs │ ├── llm.mjs │ ├── filter.mjs │ ├── route.mjs │ └── se