Crypto Tracker CLI 🚀

A lightweight and fast CLI tool to fetch real-time cryptocurrency prices directly from your terminal.

Built with TypeScript using the CoinGecko public API — no API key required.

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✨ Features

• 📈 Real-time cryptocurrency prices
• ⚡ Fast and minimal CLI output
• 🔒 Input validation & error handling
• 🧠 Strong typing with TypeScript
• 🌍 Supports multiple fiat & crypto currencies
• 🔓 No API key required

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📦 Installation

Install globally via npm:

npm install -g @nilesh-padiyar/crypto-tracker

Before installing, make sure you have

• Node.js (v14 or higher recommended)
• npm (comes with Node.js)

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⚡ Usage

crypto <coin> <currency>

Examples

crypto bitcoin usd
crypto ethereum inr
crypto dogecoin usd

Example Output

BITCOIN price: 46662 USD

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💱 Supported Currencies

Supports all currencies available from the CoinGecko API.
To see the full list of supported currencies, run:

crypto --currencies

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🧠 How It Works

• Fetches live price data from the CoinGecko API
• Validates user input
• Displays clean output in the terminal

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Notes on Rate-Limiting

CoinGecko public API allows up to 50 requests per minute per IP.

• If you hit the limit, the CLI will automatically retry with exponential backoff.
• Example warning:

⚠ 429 Rate limit hit, retrying in 1000ms...
⚠ 429 Rate limit hit, retrying in 2000ms...
⚠ 429 Rate limit hit, retrying in 4000ms...
✖ Something went wrong

• This ensures users understand their usage limits while preventing the CLI from failing silently.
• Cached and fallback currencies help reduce unnecessary API calls.

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🛠️ Development Setup

If you want to work on the project locally:

git clone https://github.com/nilesh-padiyar/crypto-tracker.git
cd crypto-tracker
npm install
npm run build

Run locally:

node dist/index.js bitcoin usd

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🔗 Using Locally (Optional)

npm link
crypto bitcoin usd

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⚙️ CLI Configuration

Make sure your package.json includes:

"bin": {
  "crypto": "dist/index.js"
}

And your entry file starts with:

#!/usr/bin/env node

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🔄 Updating

npm update -g @nilesh-padiyar/crypto-tracker

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🧪 Tech Stack

• Node.js
• TypeScript
• Async/Await
• CoinGecko Public API

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🤝 Contributing

Contributions are welcome!

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Submit a pull request

Please keep commits clean and meaningful.

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📜 License

MIT — free to use, modify, and distribute

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🙌 Author

Nilesh Padiyar

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