Cryptocurrency Data Fetcher and Analytics API

Overview

This project is a Node.js application that fetches cryptocurrency data for Bitcoin, Matic, and Ethereum, stores it in MongoDB, and provides APIs to retrieve the latest data and calculate price deviations.

Technologies

• Node.js: JavaScript runtime.
• Express.js: Web framework.
• MongoDB: Database.
• CoinGecko API: To fetch cryptocurrency data.

Setup Instructions

Prerequisites

• Node.js (version 14.x or higher).
• MongoDB (local or MongoDB Atlas).
• CoinGecko API key (optional).

Steps to Set Up

1. Clone the repository:

   git clone https://github.com/yourusername/crypto-data-fetcher.git
   cd crypto-data-fetcher

2. Install Dependencies:

   npm install

3. Set up MongoDB connection:

   MONGODB_URI=mongodb://localhost:27017/crypto_data

4. Set up CoinGecko API key: COINGECKO_API_KEY=
5. Start the server: npm start

API Endpoints

1. Fetch Cryptocurrency Data The background job runs every 2 hours, fetching data from the CoinGecko API and saving it to MongoDB.
2. Get Latest Data

   GET /stats?coin=<coin_name>

3. Calculate Standard Deviation

   GET /stats?coin=bitcoin
   

API Endpoints

Background Job Runs every 2 hours using node-cron to fetch data for Bitcoin, Matic, and Ethereum from the CoinGecko API.

const cron = require('node-cron');

cron.schedule('0 */2 * * *', () => {
  fetchData();
});