Status: [LIVE] Endpoints found: https://YOUR-SERVICE.onrender.com/api/health` Source: https://github.com/AanchalKukreja/ai-chatbot-fullstack # AI Chatbot (full-stack) A conversational AI assistant with a React front end and an Express back end that keeps the Gemini API key private. This is **Stage 1**: a secure back end, a faithful React port of the original UI, and the basics done properly (validation, rate limiting, tests). <!-- Screenshot placeholder: replace with a real capture, e.g. docs/screenshots/new-1440-light-chat.png -->  ## Features - Chat with Google Gemini, with real conversation memory (the last 10 messages are sent each time) - Light and dark themes, sound effects, "AI is thinking" indicator, live character counter - Enter to send, Shift+Enter for a new line; the box grows to 5 lines, then scrolls - Round icon send button with disabled, hover, pressed and loading (spinner) states - **Copy** button under every bot reply (with a "Copied" confirmation), and **Regenerate** on the latest reply - Welcome block with starter-question chips; it hides after the first message and returns after clearing - Clear chat and export the conversation as a `.txt` file - Chat is saved in `localStorage` (capped at 50 messages, read defensively) - Friendly error messages, with failed messages never left in the conversation context - Bot replies are rendered as **markdown**: headings, bold and italics, lists, links, quotes and tables (tables scroll sideways inside the bubble). Your own messages stay plain text. - **Code blocks** with syntax highlighting, the language name, and a Copy button for just that code - Safe by design: raw HTML is never rendered, output is sanitized, and links open in a new tab and may only be `http`, `https` or `mailto` - The reply Copy button copies the markdown source, not the rendered HTML - Long words and links wrap instead of overflowing - The view follows new messages, but does not jump if you have scrolled up to read - Responsive layout that stays clear of notches and the on-screen keyboard (`100dvh`, saf