📊 Dynamic Portfolio Backend

A Node.js + Express backend service to power the Dynamic Portfolio Dashboard. It fetches real-time stock data from Yahoo Finance and Google Finance, calculates investment metrics, and serves clean API responses for frontend use.

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🔧 Tech Stack

• Node.js
• Express.js
• Yahoo Finance (npm yahoo-finance2)
• Google Finance Scraping (axios + cheerio)
• NodeCache for in-memory caching
• p-limit + p-throttle for throttled parallel requests

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🚀 Features

• Fetches stock data from both Yahoo & Google
• Calculates CMP, P/E, EPS, investment value, gain/loss
• Handles NSE & BSE symbols intelligently
• Caches results for faster repeat access
• Exposes clean REST API for frontend

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📁 Project Structure

dynamic-portfolio-backend/ │ ├── controllers/ # Business logic │ └── portfolio.js │ ├── services/ # Yahoo/Google scraping logic │ ├── googleService.js │ └── yahooService.js │ ├── utils/ # Helper functions │ └── calculate.js │ ├── cache/ # NodeCache setup │ └── cache.js │ ├── routes/ # Express routes │ └── portfolioRoutes.js │ ├── index.js # App entry point └── package.json

⚙️ Setup Instructions (Local)

1. Clone the repo

git clone https://github.com/your-username/dynamic-portfolio-backend.git

2. Clone the repo

cd dynamic-portfolio-backend

###3. Run the server

npm run dev Visit: http://localhost:8000/api/portfolio