BalanceFit is a daily nutrition and workout tracker with:

• AI-based natural-language parsing for food and exercise
• Macro and calorie tracking
• Daily goals
• History calendar
• Light/Dark theme toggle
• Responsive UI with animated background

The app uses a backend proxy so your API key stays on the server.

https://balancefit-api.onrender.com/

• Replaced Nutritionix flow with GPT-compatible API parsing
• Added dark mode toggle and saved theme preference
• Redesigned UI (paper/blue theme + animated background)
• Improved mobile layout and input/button alignment
• Improved calendar visibility/contrast in dark mode
• Removed in-page advertising blocks

• Frontend: HTML, Tailwind CDN, vanilla JavaScript
• Backend: Node.js + Express
• AI API: GPT-compatible chat completions endpoint

Create a .env file in the project root:

GPT_20B_API_KEY=
GPT_20B_MODEL=openai/gpt-oss-20b
GPT_20B_API_BASE_URL=https://openrouter.ai/api/v1

PORT=5174
NODE_ENV=development

Optional (only needed if you later re-enable host-based controls):

ALLOWED_HOSTS=localhost,127.0.0.1

npm install
npm start

Open: http://localhost:5174

• POST /api/gpt/natural/nutrients
• POST /api/gpt/natural/exercise

Backward-compatible alias also exists:

• POST /api/nx/natural/:endpoint

• If the server says GPT_20B_API_KEY is not configured, add your key in .env.
• If startup fails with EADDRINUSE, port 5174 is already in use. Stop the existing process or change PORT in .env.