Cryptocurrency Data Aggregation Service

Introduction

A server-side application built with Node.js and MongoDB that fetches real-time cryptocurrency data from the CoinGecko API and stores it in a MongoDB database hosted on MongoDB Atlas. It provides two APIs to retrieve the latest data and statistical deviation of cryptocurrency prices.

Features

• Background job fetching current price, market cap, and 24-hour change for Bitcoin, Matic, and Ethereum every 2 hours.

• /stats API returning the latest data for a specified cryptocurrency.

• /deviation API calculating the standard deviation of the price for the last 100 records of a specified cryptocurrency.

Prerequisites

• Node.js installed on your machine.

• A MongoDB Atlas account with a created cluster and database.

• Environment variables set for database connection and other configurations.

Installation

1. Clone the repository:

git clone https://github.com/yourusername/crypto-stats.git

cd crypto-stats

2. Install dependencies:

npm install

3. Set up environment variables in a .env file:

MONGODB_URI=mongodb+srv://<username>:<password>@<cluster-name>.mongodb.net/<database-name>?retryWrites=true&w=majority

Running the Project

Start the server:

node server.js

API Documentation

1. /stats

• Endpoint: GET /stats

• Query Parameters:

• coin (required): The cryptocurrency ID (e.g., bitcoin, matic-network, ethereum).

• Sample Request:

curl "http://localhost:3000/stats?coin=bitcoin"

• Sample Response:

{

"price": 40000,

"marketCap": 800000000,

"24hChange": 3.4

}

2. /deviation

• Endpoint: GET /deviation

• Query Parameters:

• coin (required): The cryptocurrency ID (e.g., bitcoin, matic-network, ethereum).

• Sample Request:

curl "http://localhost:3000/deviation?coin=bitcoin"

• Sample Response:

{

"deviation": 4082.48

}