KoinX Backend Internship Assignment

This project is a backend application developed using Node.js and MongoDB to track cryptocurrency prices for Bitcoin, Matic, and Ethereum. It fetches current market data every minute, stores it in a MongoDB database, and provides APIs for fetching the latest stats and calculating price deviation.

Features

• Fetches and stores the current price, market cap, and 24-hour change for Bitcoin, Matic, and Ethereum.
• Provides an API endpoint to retrieve the latest data for a specific cryptocurrency.
• Calculates and returns the standard deviation of the last 100 price records for a requested cryptocurrency.

Technologies Used

• Node.js: JavaScript runtime for building the server-side application.
• Express: Web framework for building APIs.
• MongoDB: NoSQL database for storing cryptocurrency data.
• Mongoose: ODM library for MongoDB.
• Axios: For making HTTP requests to the CoinGecko API.
• Node-cron: For scheduling background jobs.
• dotenv: For managing environment variables.

Data Model

The data is stored in a MongoDB collection named cryptos with the following schema:

• coin: String (required)
• price: Number (required)
• marketCap: Number (required)
• change24h: Number (required)
• timestamp: Date (default: current date)

Deployment

Deployed on Vercel at following url: https://koinx-task-harsh.vercel.app

API Endpoints

1. Get Latest Cryptocurrency Stats

• Endpoint: /api/stats

• Method: GET

• Examples:

  • /api/stats?coin=bitcoin

  • /api/stats?coin=matic-network

  • /api/stats?coin=ethereum

2. Get Price Deviation

• Endpoint: /api/deviation

• Method: GET

• Examples:

  • /api/deviation?coin=bitcoin

  • /api/deviation?coin=matic-network

  • /api/deviation?coin=ethereum

Contributing

Contributions are welcome! Please feel free to submit a pull request or open an issue for any bugs or feature requests.